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8. An open-access database and analysis tool for perovskite solar cells based on the FAIR data principles

Author

Jacobsson, T. Jesper, Hultqvist, Adam, García-Fernández, Alberto, Anand, Aman, Al-Ashouri, Amran, Hagfeldt, Anders, Crovetto, Andrea, Abate, Antonio, Ricciardulli, Antonio Gaetano, Vijayan, Anuja, Kulkarni, Ashish, Anderson, Assaf Y., Darwich, Barbara Primera, Yang, Bowen, Coles, Brendan L., Perini, Carlo A. R., Rehermann, Carolin, Ramirez, Daniel, Fairen-Jimenez, David, Di Girolamo, Diego, Jia, Donglin, Avila, Elena, Juarez-Perez, Emilio J., Baumann, Fanny, Mathies, Florian, González, G. S. Anaya, Boschloo, Gerrit, Nasti, Giuseppe, Paramasivam, Gopinath, Martínez-Denegri, Guillermo, Näsström, Hampus, Michaels, Hannes, Köbler, Hans, Wu, Hua, Benesperi, Iacopo, Dar, M. Ibrahim, Bayrak Pehlivan, Ilknur, Gould, Isaac E., Vagott, Jacob N., Dagar, Janardan, Kettle, Jeff, Yang, Jie, Li, Jinzhao, Smith, Joel A., Pascual, Jorge, Jerónimo-Rendón, Jose J., Montoya, Juan Felipe, Correa-Baena, Juan-Pablo, Qiu, Junming, Wang, Junxin, Sveinbjörnsson, Kári, Hirselandt, Katrin, Dey, Krishanu, Frohna, Kyle, Mathies, Lena, Castriotta, Luigi A., Aldamasy, Mahmoud. H., Vasquez-Montoya, Manuel, Ruiz-Preciado, Marco A., Flatken, Marion A., Khenkin, Mark V., Grischek, Max, Kedia, Mayank, Saliba, Michael, Anaya, Miguel, Veldhoen, Misha, Arora, Neha, Shargaieva, Oleksandra, Maus, Oliver, Game, Onkar S., Yudilevich, Ori, Fassl, Paul, Zhou, Qisen, Betancur, Rafael, Munir, Rahim, Patidar, Rahul, Stranks, Samuel D., Alam, Shahidul, Kar, Shaoni, Unold, Thomas, Abzieher, Tobias, Edvinsson, Tomas, David, Tudur Wyn, Paetzold, Ulrich W., Zia, Waqas, Fu, Weifei, Zuo, Weiwei, Schröder, Vincent R. F., Tress, Wolfgang, Zhang, Xiaoliang, Chiang, Yu-Hsien, Iqbal, Zafar, Xie, Zhiqiang, and Unger, Eva

Published
2022
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10. Device Performance of Emerging Photovoltaic Materials (Version 4)

Author

Almora, Osbel, primary, Cabrera, Carlos I., additional, Erten‐Ela, Sule, additional, Forberich, Karen, additional, Fukuda, Kenjiro, additional, Guo, Fei, additional, Hauch, Jens, additional, Ho‐Baillie, Anita W. Y., additional, Jacobsson, T. Jesper, additional, Janssen, Rene A. J., additional, Kirchartz, Thomas, additional, Loi, Maria A., additional, Mathew, Xavier, additional, Mitzi, David B., additional, Nazeeruddin, Mohammad K., additional, Paetzold, Ulrich W., additional, Rand, Barry P., additional, Rau, Uwe, additional, Someya, Takao, additional, Unger, Eva, additional, Vaillant‐Roca, Lídice, additional, and Brabec, Christoph J., additional

Published
2023
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13. Application of large datasets to assess trends in the stability of perovskite photovoltaics through machine learning.

Author

Alsulami, Bashayer Nafe N., David, Tudur Wyn, Essien, A., Kazim, Samrana, Ahmad, Shahzada, Jacobsson, T. Jesper, Feeney, Andrew, and Kettle, Jeff

Abstract

Current trends in manufacturing indicate that optimised decision making using new state-of-the-art machine learning (ML) technologies will be used. ML is a versatile technique that rapidly and accurately generates new insights from multifactorial data. The ML approach has been applied to a perovskite solar cell (PSC) database to elucidate trends in stability and forecast the stability of new configurations. A database consisting of 6038 entries of device characteristics, performance, and stability data was utilised, and a sequential minimal optimisation regression (SMOreg) model was employed to determine the most influential factors governing solar cell stability. When considering sub-sections of data, it was found that pin-device architectures provided the best model fittings with a training correlation efficiency of 0.963, compared to 0.699 for all device architectures. By establishing models for each PSC architecture, the analysis allows the identification of materials that can lead to improvements in stability. This paper also attempts to summarise some key challenges and trends in the current research methodologies. [ABSTRACT FROM AUTHOR]

Published
2024
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14. Rationalizing Performance Losses of Wide Bandgap Perovskite Solar Cells Evident in Data from the Perovskite Database.

Author

Suchan, Klara, Jacobsson, T. Jesper, Rehermann, Carolin, Unger, Eva L., Kirchartz, Thomas, and Wolff, Christian M.

Abstract

Metal halide perovskites (MHPs) have become a widely studied class of semiconductors for various optoelectronic devices. The possibility to tune their bandgap (Eg) over a broad spectral range from 1.2 eV to 3 eV by compositional engineering makes them particularly attractive for light emitting devices and multi‐junction solar cells. In this metadata study, data from Peer‐reviewed publications available in the Perovskite Database (www.perovskitedatabase.com) is used to evaluate the current state of Eg tuning in wideEg MHP semiconductors. Recent literature on wide Eg MHP semiconductors is examined and the data is extracted and uploaded onto the Perovskite Database. Beyond describing recent highlights and scientific breakthroughs, general trends are drawn from 45,000 individual experimental datasets of MHP solar cell devices. The historical evolution of MHP solar cells is recapitulated, and general conclusions are drawn about the current limits of device performance. Three dominant causes are identified and discussed for the degradation of performance relative to the Shockley‐Queisser (SQ) model's theoretical limit for single‐junction solar cells: 1) energetically mismatched selective transport materials for wide Eg MHPs, 2) lower optoelectronic quality of wide Eg MHP absorbers, and 3) dynamically evolving compositional heterogeneity due to light‐induced phase segregation phenomena. [ABSTRACT FROM AUTHOR]

Published
2024
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15. Device Performance of Emerging Photovoltaic Materials (Version 4).

Author

Almora, Osbel, Cabrera, Carlos I., Erten‐Ela, Sule, Forberich, Karen, Fukuda, Kenjiro, Guo, Fei, Hauch, Jens, Ho‐Baillie, Anita W. Y., Jacobsson, T. Jesper, Janssen, Rene A. J., Kirchartz, Thomas, Loi, Maria A., Mathew, Xavier, Mitzi, David B., Nazeeruddin, Mohammad K., Paetzold, Ulrich W., Rand, Barry P., Rau, Uwe, Someya, Takao, and Unger, Eva

Subjects
SHORT-circuit currents, PHOTOVOLTAIC power generation, SCHOLARLY periodicals, PERIODICAL articles
Abstract

Following the 3rd release of the "Emerging PV reports", the best achievements in the performance of emerging photovoltaic (e‐PV) devices in diverse e‐PV research subjects are summarized, as reported in peer‐reviewed articles in academic journals since August 2022. Updated graphs, tables, and analyses are provided with several performance parameters, such as power conversion efficiency, open‐circuit voltage, short‐circuit current density, fill factor, light utilization efficiency, and stability test energy yield. These parameters are presented as a function of the photovoltaic bandgap energy and the average visible transmittance for each technology and application, and are put into perspective using, for example, the detailed balance efficiency limit. The 4th installment of the "Emerging PV reports" discusses the "PV emergence" classification with respect to the "PV technology generations" and "PV research waves" and highlights the latest device performance progress in multijunction and flexible photovoltaics. Additionally, Dale‐Scarpulla's plots of efficiency‐effort in terms of cumulative academic publication count are also introduced. [ABSTRACT FROM AUTHOR]

Published
2024
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16. List of contributors

Author

Abate, Antonio, primary, Abdi-Jalebi, Mojtaba, additional, Boschloo, Gerrit, additional, Czudek, Aniela, additional, Edvinsson, Tomas, additional, Gholipour, Somayeh, additional, Ghosh, Dibyajyoti, additional, Hagfeldt, Anders, additional, Ibrahim Dar, M., additional, Jacobsson, T. Jesper, additional, Jiménez-López, Jesús, additional, Johansson, Erik M.J., additional, Kim, Hui-Seon, additional, Kullgren, Jolla, additional, Man, Gabriel J., additional, Méndez, María, additional, Montcada, Núria F., additional, Palomares, Emilio, additional, Pazoki, Meysam, additional, Philippe, Bertrand, additional, Phung, Nga, additional, Rahman, Mohammad Ziaur, additional, Rensmo, Håkan, additional, Sadhanala, Aditya, additional, Safdari, Majid, additional, Saliba, Michael, additional, Tress, Wolfgang, additional, Unger, Eva L., additional, Wolf, Matthew J., additional, and Yang, Wenxing, additional

Published
2020
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19. Direct Measurements of Interfacial Photovoltage and Band Alignment in Perovskite Solar Cells Using Hard X-ray Photoelectron Spectroscopy

Author

Svanström, Sebastian, primary, García Fernández, Alberto, additional, Sloboda, Tamara, additional, Jacobsson, T. Jesper, additional, Zhang, Fuguo, additional, Johansson, Fredrik O. L., additional, Kühn, Danilo, additional, Céolin, Denis, additional, Rueff, Jean-Pascal, additional, Sun, Licheng, additional, Aitola, Kerttu, additional, Rensmo, Håkan, additional, and Cappel, Ute B., additional

Published
2023
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21. Device Performance of Emerging Photovoltaic Materials (Version 3)

Author

Almora, Osbel, primary, Baran, Derya, additional, Bazan, Guillermo C., additional, Cabrera, Carlos I., additional, Erten‐Ela, Sule, additional, Forberich, Karen, additional, Guo, Fei, additional, Hauch, Jens, additional, Ho‐Baillie, Anita W. Y., additional, Jacobsson, T. Jesper, additional, Janssen, Rene A. J., additional, Kirchartz, Thomas, additional, Kopidakis, Nikos, additional, Loi, Maria A., additional, Lunt, Richard R., additional, Mathew, Xavier, additional, McGehee, Michael D., additional, Min, Jie, additional, Mitzi, David B., additional, Nazeeruddin, Mohammad K., additional, Nelson, Jenny, additional, Nogueira, Ana F., additional, Paetzold, Ulrich W., additional, Rand, Barry P., additional, Rau, Uwe, additional, Snaith, Henry J., additional, Unger, Eva, additional, Vaillant‐Roca, Lídice, additional, Yang, Chenchen, additional, Yip, Hin‐Lap, additional, and Brabec, Christoph J., additional

Published
2022
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22. Cs1−xDMAxPbI3 versus CsPbI3 for Perovskite Solar Cells.

Author

Liu, Mengqi, Duan, Linrui, Jacobsson, T. Jesper, and Luo, Jingshan

Abstract

Inorganic CsPbI3 perovskite solar cells (CsPbI3 PSCs) have attracted extensive attention because of their excellent thermal stability and appropriate bandgap for tandem solar cells. At present, intermediate phase engineering with organic additive, e.g., dimethyl amine iodide (DMAI), is the most common method to obtain high‐efficiency CsPbI3 PSCs. However, it remains controversial whether the intermediate phase is entirely converted into a pure CsPbI3 phase. By exploring the effect of annealing temperature, herein, it is demonstrated that substantial organic residues remain in the produced films while using the current standard recipes of DMA+‐assisted synthesis of Cs1−xDMAxPbI3 perovskites. Thermal gravimetric and nuclear magnetic resonance show that DMA+ remains in films annealed at a standard annealing temperature of 190 °C. The DMA+ does, however, disappear if the annealing temperature is increased to 340 °C, which leads to a larger grain size, a contraction of the lattice, a narrower bandgap, and a redshift of the absorption onset. Though both Cs1−xDMAxPbI3 and CsPbI3 perovskite solar cells show decent efficiencies, the pure CsPbI3 perovskite solar cells annealed at a higher temperature demonstrate higher operational stability. [ABSTRACT FROM AUTHOR]

Published
2023
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26. Device Performance of Emerging Photovoltaic Materials (Version 3).

Author

Almora, Osbel, Baran, Derya, Bazan, Guillermo C., Cabrera, Carlos I., Erten‐Ela, Sule, Forberich, Karen, Guo, Fei, Hauch, Jens, Ho‐Baillie, Anita W. Y., Jacobsson, T. Jesper, Janssen, Rene A. J., Kirchartz, Thomas, Kopidakis, Nikos, Loi, Maria A., Lunt, Richard R., Mathew, Xavier, McGehee, Michael D., Min, Jie, Mitzi, David B., and Nazeeruddin, Mohammad K.

Subjects
PHOTOVOLTAIC power systems, SOLAR cells, OPEN-circuit voltage, SHORT-circuit currents, CELL junctions, SCHOLARLY periodicals
Abstract

Following the 2nd release of the "Emerging PV reports," the best achievements in the performance of emerging photovoltaic devices in diverse emerging photovoltaic research subjects are summarized, as reported in peer‐reviewed articles in academic journals since August 2021. Updated graphs, tables, and analyses are provided with several performance parameters, e.g., power conversion efficiency, open‐circuit voltage, short‐circuit current density, fill factor, light utilization efficiency, and stability test energy yield. These parameters are presented as a function of the photovoltaic bandgap energy and the average visible transmittance for each technology and application, and are put into perspective using, e.g., the detailed balance efficiency limit. The 3rd installment of the "Emerging PV reports" extends the scope toward triple junction solar cells. [ABSTRACT FROM AUTHOR]

Published
2023
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28. An open-access database and analysis tool for perovskite solar cells based on the FAIR data principles

Author

Jacobsson, T. Jesper, primary, Hultqvist, Adam, additional, García-Fernández, Alberto, additional, Anand, Aman, additional, Al-Ashouri, Amran, additional, Hagfeldt, Anders, additional, Crovetto, Andrea, additional, Abate, Antonio, additional, Ricciardulli, Antonio Gaetano, additional, Vijayan, Anuja, additional, Kulkarni, Ashish, additional, Anderson, Assaf Y., additional, Darwich, Barbara Primera, additional, Yang, Bowen, additional, Coles, Brendan L., additional, Perini, Carlo A. R., additional, Rehermann, Carolin, additional, Ramirez, Daniel, additional, Fairen-Jimenez, David, additional, Di Girolamo, Diego, additional, Jia, Donglin, additional, Avila, Elena, additional, Juarez-Perez, Emilio J., additional, Baumann, Fanny, additional, Mathies, Florian, additional, González, G. S. Anaya, additional, Boschloo, Gerrit, additional, Nasti, Giuseppe, additional, Paramasivam, Gopinath, additional, Martínez-Denegri, Guillermo, additional, Näsström, Hampus, additional, Michaels, Hannes, additional, Köbler, Hans, additional, Wu, Hua, additional, Benesperi, Iacopo, additional, Dar, M. Ibrahim, additional, Bayrak Pehlivan, Ilknur, additional, Gould, Isaac E., additional, Vagott, Jacob N., additional, Dagar, Janardan, additional, Kettle, Jeff, additional, Yang, Jie, additional, Li, Jinzhao, additional, Smith, Joel A., additional, Pascual, Jorge, additional, Jerónimo-Rendón, Jose J., additional, Montoya, Juan Felipe, additional, Correa-Baena, Juan-Pablo, additional, Qiu, Junming, additional, Wang, Junxin, additional, Sveinbjörnsson, Kári, additional, Hirselandt, Katrin, additional, Dey, Krishanu, additional, Frohna, Kyle, additional, Mathies, Lena, additional, Castriotta, Luigi A., additional, Aldamasy, Mahmoud. H., additional, Vasquez-Montoya, Manuel, additional, Ruiz-Preciado, Marco A., additional, Flatken, Marion A., additional, Khenkin, Mark V., additional, Grischek, Max, additional, Kedia, Mayank, additional, Saliba, Michael, additional, Anaya, Miguel, additional, Veldhoen, Misha, additional, Arora, Neha, additional, Shargaieva, Oleksandra, additional, Maus, Oliver, additional, Game, Onkar S., additional, Yudilevich, Ori, additional, Fassl, Paul, additional, Zhou, Qisen, additional, Betancur, Rafael, additional, Munir, Rahim, additional, Patidar, Rahul, additional, Stranks, Samuel D., additional, Alam, Shahidul, additional, Kar, Shaoni, additional, Unold, Thomas, additional, Abzieher, Tobias, additional, Edvinsson, Tomas, additional, David, Tudur Wyn, additional, Paetzold, Ulrich W., additional, Zia, Waqas, additional, Fu, Weifei, additional, Zuo, Weiwei, additional, Schröder, Vincent R. F., additional, Tress, Wolfgang, additional, Zhang, Xiaoliang, additional, Chiang, Yu-Hsien, additional, Iqbal, Zafar, additional, Xie, Zhiqiang, additional, and Unger, Eva, additional

Published
2021
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29. Device Performance of Emerging Photovoltaic Materials (Version 2)

Author

Almora, Osbel, primary, Baran, Derya, additional, Bazan, Guillermo C., additional, Berger, Christian, additional, Cabrera, Carlos I., additional, Catchpole, Kylie R., additional, Erten‐Ela, Sule, additional, Guo, Fei, additional, Hauch, Jens, additional, Ho‐Baillie, Anita W. Y., additional, Jacobsson, T. Jesper, additional, Janssen, Rene A. J., additional, Kirchartz, Thomas, additional, Kopidakis, Nikos, additional, Li, Yongfang, additional, Loi, Maria A., additional, Lunt, Richard R., additional, Mathew, Xavier, additional, McGehee, Michael D., additional, Min, Jie, additional, Mitzi, David B., additional, Nazeeruddin, Mohammad K., additional, Nelson, Jenny, additional, Nogueira, Ana F., additional, Paetzold, Ulrich W., additional, Park, Nam‐Gyu, additional, Rand, Barry P., additional, Rau, Uwe, additional, Snaith, Henry J., additional, Unger, Eva, additional, Vaillant‐Roca, Lídice, additional, Yip, Hin‐Lap, additional, and Brabec, Christoph J., additional

Published
2021
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30. Reporting Device Performance of Emerging Photovoltaic Materials (Version 1)

Author

Almora, Osbel, primary, Baran, Derya, additional, Bazan, Guillermo C, additional, Cabrera, Carlos I, additional, Catchpole, Kylie R, additional, Erten-Ela, Sule, additional, Guo, Fei, additional, Hauch, Jens, additional, Ho-Baillie, Anita W Y, additional, Jacobsson, T Jesper, additional, Janssen, Rene A J, additional, Kirchartz, Thomas, additional, Kopidakis, Nikos, additional, Li, Yongfang, additional, Loi, Maria A, additional, Lunt, Richard R, additional, Mathew, Xavier, additional, Mcgehee, Michael D, additional, Min, Jie, additional, Mitzi, David B, additional, Nazeeruddin, Mohammad K, additional, Nelson, Jenny, additional, Nogueira, Ana F, additional, Paetzold, Ulrich W, additional, Park, Nam-Gyu, additional, Rand, Barry P, additional, Rau, Uwe, additional, Snaith, Henry J, additional, Unger, Eva, additional, Vaillant-Roca, Lídice, additional, Yip, Hin-Lap, additional, and Brabec, Christoph J, additional

Published
2021
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34. Device Performance of Emerging Photovoltaic Materials (Version 1)

Author

Almora, Osbel, primary, Baran, Derya, additional, Bazan, Guillermo C., additional, Berger, Christian, additional, Cabrera, Carlos I., additional, Catchpole, Kylie R., additional, Erten‐Ela, Sule, additional, Guo, Fei, additional, Hauch, Jens, additional, Ho‐Baillie, Anita W. Y., additional, Jacobsson, T. Jesper, additional, Janssen, Rene A. J., additional, Kirchartz, Thomas, additional, Kopidakis, Nikos, additional, Li, Yongfang, additional, Loi, Maria A., additional, Lunt, Richard R., additional, Mathew, Xavier, additional, McGehee, Michael D., additional, Min, Jie, additional, Mitzi, David B., additional, Nazeeruddin, Mohammad K., additional, Nelson, Jenny, additional, Nogueira, Ana F., additional, Paetzold, Ulrich W., additional, Park, Nam‐Gyu, additional, Rand, Barry P., additional, Rau, Uwe, additional, Snaith, Henry J., additional, Unger, Eva, additional, Vaillant‐Roca, Lídice, additional, Yip, Hin‐Lap, additional, and Brabec, Christoph J., additional

Published
2020
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36. Device Performance of Emerging Photovoltaic Materials (Version 1).

Author

Almora, Osbel, Baran, Derya, Bazan, Guillermo C., Berger, Christian, Cabrera, Carlos I., Catchpole, Kylie R., Erten‐Ela, Sule, Guo, Fei, Hauch, Jens, Ho‐Baillie, Anita W. Y., Jacobsson, T. Jesper, Janssen, Rene A. J., Kirchartz, Thomas, Kopidakis, Nikos, Li, Yongfang, Loi, Maria A., Lunt, Richard R., Mathew, Xavier, McGehee, Michael D., and Min, Jie

Subjects
BUILDING-integrated photovoltaic systems, ELECTRIC power production, SOLAR cells, PHOTOVOLTAIC power generation
Abstract

Emerging photovoltaics (PVs) focus on a variety of applications complementing large scale electricity generation. Organic, dye‐sensitized, and some perovskite solar cells are considered in building integration, greenhouses, wearable, and indoor applications, thereby motivating research on flexible, transparent, semitransparent, and multi‐junction PVs. Nevertheless, it can be very time consuming to find or develop an up‐to‐date overview of the state‐of‐the‐art performance for these systems and applications. Two important resources for recording research cells efficiencies are the National Renewable Energy Laboratory chart and the efficiency tables compiled biannually by Martin Green and colleagues. Both publications provide an effective coverage over the established technologies, bridging research and industry. An alternative approach is proposed here summarizing the best reports in the diverse research subjects for emerging PVs. Best performance parameters are provided as a function of the photovoltaic bandgap energy for each technology and application, and are put into perspective using, e.g., the Shockley–Queisser limit. In all cases, the reported data correspond to published and/or properly described certified results, with enough details provided for prospective data reproduction. Additionally, the stability test energy yield is included as an analysis parameter among state‐of‐the‐art emerging PVs. [ABSTRACT FROM AUTHOR]

Published
2021
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39. Unreacted PbI2 as a Double-Edged Sword for Enhancing the Performance of Perovskite Solar Cells

Author

Jacobsson, T. Jesper, Correa-Baena, Juan-Pablo, Halvani Anaraki, Elham, Philippe, Bertrand, Stranks, Samuel D., Bouduban, Marine E. F., Tress, Wolfgang, Schenk, Kurt, Teuscher, Joël, Moser, Jacques-E., Rensmo, Håkan, Hagfeldt, Anders, Stranks, Samuel [0000-0002-8303-7292], and Apollo - University of Cambridge Repository

Subjects
0306 Physical Chemistry (incl. Structural), 0912 Materials Engineering
Abstract

Lead halide perovskites have over the past few years attracted considerable interest as photo absorbers in PV applications with record efficiencies now reaching 22%. It has recently been found that not only the composition but also the precise stoichiometry is important for the device performance. Recent reports have, for example, demonstrated small amount of PbI2 in the perovskite films to be beneficial for the overall performance of both the standard perovskite, CH3NH3PbI3, as well as for the mixed perovskites (CH3NH3)x(CH(NH2)2)(1–x)PbBryI(3–y). In this work a broad range of characterization techniques including X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), photo electron spectroscopy (PES), transient absorption spectroscopy (TAS), UV–vis, electroluminescence (EL), photoluminescence (PL), and confocal PL mapping have been used to further understand the importance of remnant PbI2 in perovskite solar cells. Our best devices were over 18% efficient, and had in line with previous results a small amount of excess PbI2. For the PbI2-deficient samples, the photocurrent dropped, which could be attributed to accumulation of organic species at the grain boundaries, low charge carrier mobility, and decreased electron injection into the TiO2. The PbI2-deficient compositions did, however, also have advantages. The record Voc was as high as 1.20 V and was found in PbI2-deficient samples. This was correlated with high crystal quality, longer charge carrier lifetimes, and high PL yields and was rationalized as a consequence of the dynamics of the perovskite formation. We further found the ion migration to be obstructed in the PbI2-deficient samples, which decreased the JV hysteresis and increased the photostability. PbI2-deficient synthesis conditions can thus be used to deposit perovskites with excellent crystal quality but with the downside of grain boundaries enriched in organic species, which act as a barrier toward current transport. Exploring ways to tune the synthesis conditions to give the high crystal quality obtained under PbI2-poor condition while maintaining the favorable grain boundary characteristics obtained under PbI2-rich conditions would thus be a strategy toward more efficiency devices.

Published
2016

43. Valence Level Character in a Mixed Perovskite Material and Determination of the Valence Band Maximum from Photoelectron Spectroscopy: Variation with Photon Energy

Author

Philippe, Bertrand, primary, Jacobsson, T. Jesper, additional, Correa-Baena, Juan-Pablo, additional, Jena, Naresh K., additional, Banerjee, Amitava, additional, Chakraborty, Sudip, additional, Cappel, Ute B., additional, Ahuja, Rajeev, additional, Hagfeldt, Anders, additional, Odelius, Michael, additional, and Rensmo, Håkan, additional

Published
2017
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46. Unreacted PbI2 as a Double-Edged Sword for Enhancing the Performance of Perovskite Solar Cells

Author

Jacobsson, T. Jesper, primary, Correa-Baena, Juan-Pablo, additional, Halvani Anaraki, Elham, additional, Philippe, Bertrand, additional, Stranks, Samuel D., additional, Bouduban, Marine E. F., additional, Tress, Wolfgang, additional, Schenk, Kurt, additional, Teuscher, Joël, additional, Moser, Jacques-E., additional, Rensmo, Håkan, additional, and Hagfeldt, Anders, additional

Published
2016
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47. Effect of halide ratio and Cs+ addition on the photochemical stability of lead halide perovskites.

Author

Svanström, Sebastian, Jacobsson, T. Jesper, Sloboda, Tamara, Giangrisostomi, Erika, Ovsyannikov, Ruslan, Rensmo, Håkan, and Cappel, Ute B.

Abstract

Lead halide perovskite solar cells with multi-cation/mixed halide materials now give power conversion efficiencies of more than 20%. The stability of these mixed materials has been significantly improved through the addition of Cs+ compared to the original methylammonium lead iodide. However, it remains one of the most significant challenges for commercialisation. In this study, we use photoelectron spectroscopy (PES) in combination with visible laser illumination to study the photo-stability of perovskite films with different compositions. These include Br : I ratios of 50 : 50 and 17 : 83 and compositions with and without Cs+. For the samples without Cs and the 50 : 50 samples, we found that the surface was enriched in Br and depleted in I during illumination and that some of the perovskite decomposed into Pb0, organic halide salts, and iodine. After illumination, both of these reactions were partially reversible. Furthermore, the surfaces of the films were enriched in organic halide salts indicating that the cations were not degraded into volatile products. With the addition of Cs+ to the samples, photo-induced changes were significantly suppressed for a 50 : 50 bromide to iodide ratio and completely suppressed for perovskites with a 17 : 83 ratio at light intensities exceeding 1 sun equivalent. [ABSTRACT FROM AUTHOR]

Published
2018
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48. Highly Efficient CIGS Based Devices for Solar Hydrogen Production and Size Dependent Properties of ZnO Quantum Dots

Author

Jacobsson, T. Jesper

Subjects
Fysikalisk kemi, PEC, Oorganisk kemi, Hematite, Materialkemi, Hydrogen Production, CIGS, Physical Chemistry, Size Dependent Properties, Inorganic Chemistry, PV-electrolysis, Solar Water Splitting, ZnO, Quanum Dots, Materials Chemistry, Nanoparticles, Photoelectrochemical cells
Abstract

Materials and device concepts for renewable solar hydrogen production, and size dependent properties of ZnO quantum dots are the two main themes of this thesis. ZnO particles with diameters less than 10 nm, which are small enough for electronic quantum confinement, were synthesized by hydrolysis in alkaline zinc acetate solutions. Properties investigated include: the band gap - particle size relation, phonon quantum confinement, visible and UV-fluorescence as well as photocatalytic performance. In order to determine the absolute energetic position of the band edges and the position of trap levels involved in the visible fluorescence, methods based on combining linear sweep voltammetry and optical measurements were developed. The large band gap of ZnO prevents absorption of visible light, and in order to construct devices capable of utilizing a larger part of the solar spectrum, other materials were also investigated, like hematite , Fe2O3, and CIGS, CuIn1-xGaxSe2. The optical properties of hematite were investigated as a function of film thickness on films deposited by ALD. For films thinner than 20 nm, a blue shift was observed for both the absorption maximum, the indirect band gap as well as for the direct transitions. The probability for the indirect transition decreased substantially for thinner films due to a suppressed photon/phonon coupling. These effects decrease the visible absorption for films thin enough for effective charge transport in photocatalytic applications. CIGS was demonstrated to be a highly interesting material for solar hydrogen production. CIGS based photocathodes demonstrated high photocurrents for the hydrogen evolution half reaction. The electrode stability was problematic, but was solved by introducing a modular approach based on spatial separation of the basic functionalities in the device. To construct devices capable of driving the full reaction, the possibility to use cells interconnected in series as an alternative to tandem devices were investigated. A stable, monolithic device based on three CIGS cells interconnected in series, reaching beyond 10 % STH-efficiency, was finally demonstrated. With experimental support from the CIGS-devices, the entire process of solar hydrogen production was reviewed with respect to the underlying physical processes, with special focus on the similarities and differences between various device concepts.

Published
2014

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