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305 results on '"Lunt, Richard R."'

2. Coherent Hopping Transport and Giant Negative Magnetoresistance in Epitaxial CsSnBr$_{3}$

Author

Zhang, Liangji, King, Isaac, Nasyedkin, Kostyantyn, Chen, Pei, Skinner, Brian, Lunt, Richard R., and Pollanen, Johannes

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Single-crystal inorganic halide perovskites are attracting interest for quantum device applications. Here we present low-temperature quantum magnetotransport measurements on thin film devices of epitaxial single-crystal CsSnBr$_{3}$, which exhibit two-dimensional Mott variable range hopping (VRH) and giant negative magnetoresistance. These findings are described by a model for quantum interference between different directed hopping paths and we extract the temperature-dependent hopping length of charge carriers, their localization length, and a lower bound for their phase coherence length of ~100 nm at low temperatures. These observations demonstrate that epitaxial halide perovskite devices are emerging as a material class for low-dimensional quantum coherent transport devices., Comment: 11 pages (main manuscript + SI), 12 figures (5 in manuscript, 7 in SI)

Published
2021
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3. Ultraviolet and Near-Infrared Dual Band Selective-Harvesting Transparent Luminescent Solar Concentrators

Author

Yang, Chenchen, Sheng, Wei, Moemeni, Mehdi, Bates, Matthew, Herrera, Christopher K., Borhan, Babak, and Lunt, Richard R.

Subjects
Physics - Applied Physics, Condensed Matter - Materials Science
Abstract

Visibly transparent luminescent solar concentrators (TLSCs) can optimize both power production and visible transparency by selectively harvesting the invisible portion of the solar spectrum. Since the primary applications of TLSCs include building envelopes, greenhouses, automobiles, signage, and mobile electronics, maintaining aesthetics and functionalities is as important as achieving high power conversion efficiencies (PCEs) in practical deployment. In this work, we combine massive-downshifting phosphorescent nanoclusters and fluorescent organic molecules into a TLSC system as ultraviolet (UV) and near-infrared (NIR) selective-harvesting luminophores, respectively, demonstrating UV and NIR dual-band selective-harvesting TLSCs with PCE over 3%, average visible transmittance (AVT) exceeding 75% and color metrics suitable for the window industry. With distinct wavelength-selectivity and effective utilization of the invisible portion of the solar spectrum, this work reports the highest light utilization efficiency (PCE x AVT) of 2.6 for a TLSC system, the highest PCE of any transparent photovoltaic device with AVT greater than 70%, and outperforms the practical limit for non-wavelength-selective transparent photovoltaics.

Published
2020

4. Room-Temperature Processing of Inorganic Perovskite Films to Enable Flexible Solar Cells

Author

Liu, Dianyi, Yang, Chenchen, Bates, Matthew, and Lunt, Richard R.

Subjects
Physics - Applied Physics, Condensed Matter - Materials Science
Abstract

Inorganic lead halide perovskite materials have attracted great attention recently due to their potential for greater thermal stability compared to hybrid organic perovskites. However, the high processing temperature to convert from the non-perovskite phase to cubic perovskite phase in many of these systems has limited their application in flexible optoelectronic devices. Here, we report a room temperature processed inorganic PSC based on CsPbI2Br as the light harvesting layer. By combing this composition with key precursor solvents, we show that the inorganic perovskite film can be prepared by the vacuum-assist method under room temperature conditions in air. Unencapsulated devices achieved the power conversion efficiency up to 8.67% when measured under 1-sun irradiation. Exploiting this room temperature process, flexible inorganic PSCs based on an inorganic metal halide perovskite material is demonstrated., Comment: 23 pages, 4 figures, and supplemental information

Published
2018
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11. Impact of charge character on anionic cyanine-based organic salt photovoltaics.

Author

Bates, Matthew, Lunt, Sophia Y., and Lunt, Richard R.

Subjects
PHOTOVOLTAIC power generation, SALT, QUANTUM efficiency, CONSTRUCTION materials, CHARGE transfer, ELECTRON donor-acceptor complexes
Abstract

Small bandgap organic compounds with absorption in the near-infrared are exciting materials for a variety of applications ranging from light harvesters in photovoltaics to active agents in photodynamic therapy. Organic salts, a class of small molecule organic compounds comprised of an ionic chromophore and a counterion, have been used in opaque and transparent photovoltaics, primarily as donor materials in bilayer architectures. They possess excellent molecular extinction coefficients with near-infrared selective absorption, adjustable bandgaps, and tunable energy levels. To approach organic salt photovoltaics from a new perspective, we fabricated devices with an unexplored group of anionic salts comprised of a near-infrared absorbing chromophore paired with a varying number of cationic counterions. We observed different donor and acceptor decay trends in external quantum efficiencies that allowed us to separate and independently quantify exciton diffusion and charge transfer for each salt. Increased charge character on the chromophore greatly improves hole transport, as anions with a net −3 charge have charge collection lengths greater than four times those of corresponding singly charged chromophores. This presents an interesting platform for independent quantification of exciton diffusion and charge transport of an active material in a single photovoltaic device and demonstration of the important role of charge on the chromophore. The dependence of charge transport capabilities on charge character of the chromophore will be a useful tool in the design of future organic salts to engineer materials for higher efficiency transparent photovoltaics. [ABSTRACT FROM AUTHOR]

Published
2022
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19. 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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23. Phosphorescent Metal Halide Nanoclusters for Tunable Photodynamic Therapy.

Author

Medeiros, Hyllana C. D., Yang, Chenchen, Herrera, Christopher K., Broadwater, Deanna, Ensink, Elliot, Bates, Matthew, Lunt, Richard R., and Lunt, Sophia Y.

Subjects
REACTIVE oxygen species, PHOTODYNAMIC therapy, SHORT-chain fatty acids, METAL halides, BLUE light, CANCER cells
Abstract

Photodynamic therapy (PDT) is currently limited by the inability of photosensitizers (PSs) to enter cancer cells and generate sufficient reactive oxygen species. Utilizing phosphorescent triplet states of novel PSs to generate singlet oxygen offers exciting possibilities for PDT. Here, we report phosphorescent octahedral molybdenum (Mo)‐based nanoclusters (NC) with tunable toxicity for PDT of cancer cells without use of rare or toxic elements. Upon irradiation with blue light, these molecules are excited to their singlet state and then undergo intersystem crossing to their triplet state. These NCs display surprising tunability between their cellular cytotoxicity and phototoxicity by modulating the apical halide ligand with a series of short chain fatty acids from trifluoroacetate to heptafluorobutyrate. The NCs are effective in PDT against breast, skin, pancreas, and colon cancer cells as well as their highly metastatic derivatives, demonstrating the robustness of these NCs in treating a wide variety of aggressive cancer cells. Furthermore, these NCs are internalized by cancer cells, remain in the lysosome, and can be modulated by the apical ligand to produce singlet oxygen. Thus, (Mo)‐based nanoclusters are an excellent platform for optimizing PSs. Our results highlight the profound impact of molecular nanocluster chemistry in PDT applications. [ABSTRACT FROM AUTHOR]

Published
2023
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26. Consensus statement: Standardized reporting of power-producing luminescent solar concentrator performance

Author

Yang, Chenchen, Atwater, Harry A., Baldo, Marc A., Baran, Derya, Barile, Christopher J., Barr, Miles C., Bates, Matthew, Bawendi, Moungi G., Bergren, Matthew R., Borhan, Babak, Brabec, Christoph J., Brovelli, Sergio, Bulović, Vladimir, Ceroni, Paola, Debije, Michael G., Delgado-Sanchez, Jose-Maria, Dong, Wen-Ji, Duxbury, Phillip M., Evans, Rachel C., Forrest, Stephen R., Gamelin, Daniel R., Giebink, Noel C., Gong, Xiao, Griffini, Gianmarco, Guo, Fei, Herrera, Christopher K., Ho-Baillie, Anita W.Y., Holmes, Russell J., Hong, Sung-Kyu, Kirchartz, Thomas, Levine, Benjamin G., Li, Hongbo, Li, Yilin, Liu, Dianyi, Loi, Maria A., Luscombe, Christine K., Makarov, Nikolay S., Mateen, Fahad, Mazzaro, Raffaello, McDaniel, Hunter, McGehee, Michael D., Meinardi, Francesco, Menéndez-Velázquez, Amador, Min, Jie, Mitzi, David B., Moemeni, Mehdi, Moon, Jun Hyuk, Nattestad, Andrew, Nazeeruddin, Mohammad K., Nogueira, Ana F., Paetzold, Ulrich W., Patrick, David L., Pucci, Andrea, Rand, Barry R., Reichmanis, Elsa, Richards, Bryce S., Roncali, Jean, Rosei, Federico, Schmidt, Timothy W., So, Franky, Tu, Chang-Ching, Vahdani, Aria, van Sark, Wilfried G.J.H.M., Verduzco, Rafael, Vomiero, Alberto, Wong, Wallace W.H., Wu, Kaifeng, Yip, Hin-Lap, Zhang, Xiaowei, Zhao, Haiguang, Lunt, Richard R., Integration of Photovoltaic Solar Energy, and Energy and Resources

Subjects
Taverne
Abstract

Fair and meaningful device performance comparison among luminescent solar concentrator-photovoltaic (LSC-PV) reports cannot be realized without a general consensus on reporting standards in LSC-PV research. Therefore, it is imperative to adopt standardized characterization protocols for these emerging types of PV devices that are consistent with other PV devices. This commentary highlights several common limitations in LSC literature and summarizes the best practices moving forward to harmonize with standard PV reporting, considering the greater nuances present with LSC-PV. Based on these practices, a checklist of actionable items is provided to help standardize the characterization/reporting protocols and offer a set of baseline expectations for authors, reviewers, and editors. The general consensus combined with the checklist will ultimately guide LSC-PV research towards reliable and meaningful advances.

Published
2022

27. 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. Consensus statement: Standardized reporting of power-producing luminescent solar concentrator performance

Author

Yang, Chenchen, primary, Atwater, Harry A., additional, Baldo, Marc A., additional, Baran, Derya, additional, Barile, Christopher J., additional, Barr, Miles C., additional, Bates, Matthew, additional, Bawendi, Moungi G., additional, Bergren, Matthew R., additional, Borhan, Babak, additional, Brabec, Christoph J., additional, Brovelli, Sergio, additional, Bulović, Vladimir, additional, Ceroni, Paola, additional, Debije, Michael G., additional, Delgado-Sanchez, Jose-Maria, additional, Dong, Wen-Ji, additional, Duxbury, Phillip M., additional, Evans, Rachel C., additional, Forrest, Stephen R., additional, Gamelin, Daniel R., additional, Giebink, Noel C., additional, Gong, Xiao, additional, Griffini, Gianmarco, additional, Guo, Fei, additional, Herrera, Christopher K., additional, Ho-Baillie, Anita W.Y., additional, Holmes, Russell J., additional, Hong, Sung-Kyu, additional, Kirchartz, Thomas, additional, Levine, Benjamin G., additional, Li, Hongbo, additional, Li, Yilin, additional, Liu, Dianyi, additional, Loi, Maria A., additional, Luscombe, Christine K., additional, Makarov, Nikolay S., additional, Mateen, Fahad, additional, Mazzaro, Raffaello, additional, McDaniel, Hunter, additional, McGehee, Michael D., additional, Meinardi, Francesco, additional, Menéndez-Velázquez, Amador, additional, Min, Jie, additional, Mitzi, David B., additional, Moemeni, Mehdi, additional, Moon, Jun Hyuk, additional, Nattestad, Andrew, additional, Nazeeruddin, Mohammad K., additional, Nogueira, Ana F., additional, Paetzold, Ulrich W., additional, Patrick, David L., additional, Pucci, Andrea, additional, Rand, Barry P., additional, Reichmanis, Elsa, additional, Richards, Bryce S., additional, Roncali, Jean, additional, Rosei, Federico, additional, Schmidt, Timothy W., additional, So, Franky, additional, Tu, Chang-Ching, additional, Vahdani, Aria, additional, van Sark, Wilfried G.J.H.M., additional, Verduzco, Rafael, additional, Vomiero, Alberto, additional, Wong, Wallace W.H., additional, Wu, Kaifeng, additional, Yip, Hin-Lap, additional, Zhang, Xiaowei, additional, Zhao, Haiguang, additional, and Lunt, Richard R., additional

Published
2022
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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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39. 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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42. 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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