Search

Your search keyword '"Koster, L. Jan Anton"' showing total 254 results
Start Over Author "Koster, L. Jan Anton"
254 results on '"Koster, L. Jan Anton"'

1. Beginner's guide to visual analysis of perovskite and organic solar cell current density-voltage characteristics

Author

These, Albert, Koster, L. Jan Anton, Brabec, Christoph J., and Corre, Vincent M. Le

Subjects
Condensed Matter - Materials Science
Abstract

The current density-voltage characteristic (JV) is a critical tool for understanding the behaviour of solar cells. In this article, we present an overview of the key aspects of JV analysis and introduce a user-friendly flowchart that facilitates the swift identification of the most probable limiting process in a solar cell, based mainly on the outcomes of light-intensity-dependent JV measurements. The flowchart was developed through extensive drift-diffusion simulations and a rigorous review of the literature, with a specific focus on perovskite and organic solar cells. Moreover, the flowchart proposes supplementary experiments that can be conducted to obtain a more precise prediction of the primary performance losses. It therefore serves as an optimal starting point to analyse performance losses of solar cells., Comment: 50 pages (14 manuscript, 36 supporting information), 37 figures (5 main, 32 supporting information)

Published
2023
Full Text
View/download PDF

3. Impact of Oligo(Ethylene Glycol) Side Chains on the Thermoelectric Properties of Naphthalenediimide–Dialkoxybithiazole Polymers

Author

Yang, Xuwen, primary, Ye, Gang, additional, Tran, Karolina, additional, Liu, Yuru, additional, Cao, Jiamin, additional, Dong, Jingjin, additional, Portale, Giuseppe, additional, Liu, Jian, additional, Zhang, Ping, additional, Loi, Maria Antonietta, additional, Chiechi, Ryan C., additional, and Koster, L. Jan Anton, additional

Published
2024
Full Text
View/download PDF

5. Fully Screen‐Printed, Flexible, and Scalable Organic Monolithic Thermoelectric Generators.

Author

Brunetti, Irene, Ferrari, Federico, Pataki, Nathan James, Abdolhosseinzadeh, Sina, Heier, Jakob, Koster, L. Jan Anton, Lemmer, Ulrich, Kemerink, Martijn, and Caironi, Mario

Subjects
THERMOELECTRIC generators, ELECTRONIC equipment, CONDUCTIVE ink, THERMOELECTRIC materials, ELECTRIC power, POWER density, THERMOELECTRIC apparatus & appliances
Abstract

Energy‐harvesting technologies offer a sustainable, maintenance‐free alternative to conventional energy‐storage solutions in distributed low‐power applications. Flexible thermoelectric generators (TEGs) can generate electric power from a temperature gradient, even on complex surfaces. Organic materials are ideal candidates for flexible TEGs due to their good solution‐processability, natural abundance, low weight, and flexibility. Electronic and thermoelectric properties of organic materials have steadily progressed, while device architectures leveraging their advantages are largely missing. Here, a design and fabrication method are proposed for producing fully screen‐printed, flexible monolithic organic TEGs scalable up to m2, compatible with any screen‐printable ink. This approach is validated, along with its scalability, by printing TEGs composed of two different active inks, in three configurations, with up to 800 thermoelements, with performances well matching simulations based on materials parameters. It is demonstrated that by using an additive‐free graphene ink, a remarkable power density of 15 nW cm−2 at ΔT = 29.5 K can be achieved, with an estimated weight‐normalized power output of 1 µW g−1, highlighting a strong potential in portability. Owing to such power density, only limited areas are required to generate microwatts, sufficient for operating low‐power electronic devices such as sensors, and wearables. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

6. Electrically Programmed Doping Gradients Optimize the Thermoelectric Power Factor of a Conjugated Polymer.

Author

Liu, Jian, Craighero, Mariavittoria, Gupta, Vandna K., Scheunemann, Dorothea, Paleti, Sri Harish Kumar, Järsvall, Emmy, Kim, Youngseok, Xu, Kai, Reparaz, Juan Sebastián, Koster, L. Jan Anton, Campoy‐Quiles, Mariano, Kemerink, Martijn, Martinelli, Anna, and Müller, Christian

Subjects
THERMOELECTRIC power, CONJUGATED polymers, BISMUTH telluride, FUNCTIONALLY gradient materials, ELECTRIC conductivity, ORGANIC semiconductors, MONTE Carlo method, POLYTHIOPHENES
Abstract

Functionally graded materials (FGMs) are widely explored in the context of inorganic thermoelectrics, but not yet in organic thermoelectrics. Here, the impact of doping gradients on the thermoelectric properties of a chemically doped conjugated polymer is studied. The in‐plane drift of counterions in moderate electric fields is used to create lateral doping gradients in films composed of a polythiophene with oligoether side chains, doped with 2,3,5,6‐tetrafluoro‐tetracyanoquinodimethane (F4TCNQ). Raman microscopy reveals that a bias voltage of as little as 5 V across a 50 µm wide channel is sufficient to trigger counterion drift, resulting in doping gradients. The effective electrical conductivity of the graded channel decreases with bias voltage, while an overall increase in Seebeck coefficient is observed, yielding an up to eight‐fold enhancement in power factor. Kinetic Monte Carlo simulations of graded films explain the increase in power factor in terms of a roll‐off of the Seebeck coefficient at high electrical conductivities in combination with a mobility decay due to increased Coulomb scattering at high dopant concentrations. Therefore, the FGM concept is found to be a way to improve the thermoelectric performance of not yet optimally doped organic semiconductors, which may ease the screening of new materials as well as the fabrication of devices. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

12. N-type organic thermoelectrics: demonstration of ZT > 0.3

Author

Liu, Jian, van der Zee, Bas, Alessandri, Riccardo, Sami, Selim, Dong, Jingjin, Nugraha, Mohamad I., Barker, Alex J., Rousseva, Sylvia, Qiu, Li, Qiu, Xinkai, Klasen, Nathalie, Chiechi, Ryan C., Baran, Derya, Caironi, Mario, Anthopoulos, Thomas D., Portale, Giuseppe, Havenith, Remco W. A., Marrink, Siewert J., Hummelen, Jan C., and Koster, L. Jan Anton

Published
2020
Full Text
View/download PDF

13. Long-range exciton diffusion in molecular non-fullerene acceptors

Author

Firdaus, Yuliar, Le Corre, Vincent M., Karuthedath, Safakath, Liu, Wenlan, Markina, Anastasia, Huang, Wentao, Chattopadhyay, Shirsopratim, Nahid, Masrur Morshed, Nugraha, Mohamad I., Lin, Yuanbao, Seitkhan, Akmaral, Basu, Aniruddha, Zhang, Weimin, McCulloch, Iain, Ade, Harald, Labram, John, Laquai, Frédéric, Andrienko, Denis, Koster, L. Jan Anton, and Anthopoulos, Thomas D.

Published
2020
Full Text
View/download PDF

17. Backbone-driven host-dopant miscibility modulates molecular doping in NDI conjugated polymers

Author

Rosas Villalva, Diego, primary, Singh, Saumya, additional, Galuska, Luke A., additional, Sharma, Anirudh, additional, Han, Jianhua, additional, Liu, Jian, additional, Haque, Md Azimul, additional, Jang, Soyeong, additional, Emwas, Abdul H., additional, Koster, L. Jan Anton, additional, Gu, Xiaodan, additional, Schroeder, Bob C., additional, and Baran, Derya, additional

Published
2022
Full Text
View/download PDF

20. Reliability of charge carrier recombination data determined with charge extraction methods.

Author

Kniepert, Juliane, Paulke, Andreas, Perdigón-Toro, Lorena, Kurpiers, Jona, Zhang, Huotian, Gao, Feng, Yuan, Jun, Zou, Yingping, Le Corre, Vincent M., Koster, L. Jan Anton, and Neher, Dieter

Subjects
CARRIER density, CHARGE carriers, SURFACE recombination, ORGANIC thin films, SOLAR cells, OPEN-circuit voltage
Abstract

Charge extraction methods are popular for measuring the charge carrier density in thin film organic solar cells and to draw conclusions about the order and coefficient of nongeminate charge recombination. However, results from such studies may be falsified by inhomogeneous steady state carrier profiles or surface recombination. Here, we present a detailed drift-diffusion study of two charge extraction methods, bias-assisted charge extraction (BACE) and time-delayed collection field (TDCF). Simulations are performed over a wide range of the relevant parameters. Our simulations reveal that both charge extraction methods provide reliable information about the recombination order and coefficient if the measurements are performed under appropriate conditions. However, results from BACE measurements may be easily affected by surface recombination, in particular for small active layer thicknesses and low illumination densities. TDCF, on the other hand, is more robust against surface recombination due to its transient nature but also because it allows for a homogeneous high carrier density to be inserted into the active layer. Therefore, TDCF is capable to provide meaningful information on the order and coefficient of recombination even if the model conditions are not exactly fulfilled. We demonstrate this for an only 100 nm thick layer of a highly efficient nonfullerene acceptor (NFA) blend, comprising the donor polymer PM6 and the NFA Y6. TDCF measurements were performed as a function of delay time for different laser fluences and bias conditions. The full set of data could be consistently fitted by a strict second order recombination process, with a bias- and fluence-independent bimolecular recombination coefficient k2 = 1.7 × 10−17 m3 s−1. BACE measurements performed on the very same layer yielded the identical result, despite the very different excitation conditions. This proves that recombination in this blend is mostly through processes in the bulk and that surface recombination is of minor importance despite the small active layer thickness. [ABSTRACT FROM AUTHOR]

Published
2019
Full Text
View/download PDF

23. Understanding the Limitations of Charge Transporting Layers in Mixed Lead–Tin Halide Perovskite Solar Cells

Author

Zhang, Kaicheng, primary, Forberich, Karen, additional, Lüer, Larry, additional, Cerrillo, José Garcia, additional, Meng, Wei, additional, Du, Xiaoyan, additional, Le Corre, Vincent M., additional, Zhao, Yicheng, additional, Niu, Tianqi, additional, Xue, Qifan, additional, Koster, L. Jan Anton, additional, Li, Ning, additional, and Brabec, Christoph J., additional

Published
2021
Full Text
View/download PDF

25. Molecular Doping Directed by a Neutral Radical

Author

Liu, Jian, primary, Van der Zee, Bas, additional, Villava, Diego R., additional, Ye, Gang, additional, Kahmann, Simon, additional, Kamperman, Max, additional, Dong, Jingjin, additional, Qiu, Li, additional, Portale, Giuseppe, additional, Loi, Maria Antonietta, additional, Hummelen, Jan C., additional, Chiechi, Ryan C., additional, Baran, Derya, additional, and Koster, L. Jan Anton, additional

Published
2021
Full Text
View/download PDF

30. Amphipathic Side Chain of a Conjugated Polymer Optimizes Dopant Location toward Efficient N‐Type Organic Thermoelectrics

Author

Liu, Jian, primary, Ye, Gang, additional, Potgieser, Hinderikus G. O., additional, Koopmans, Marten, additional, Sami, Selim, additional, Nugraha, Mohamad Insan, additional, Villalva, Diego Rosas, additional, Sun, Hengda, additional, Dong, Jingjin, additional, Yang, Xuwen, additional, Qiu, Xinkai, additional, Yao, Chen, additional, Portale, Giuseppe, additional, Fabiano, Simone, additional, Anthopoulos, Thomas D., additional, Baran, Derya, additional, Havenith, Remco W. A., additional, Chiechi, Ryan C., additional, and Koster, L. Jan Anton, additional

Published
2020
Full Text
View/download PDF

31. Effects of Fluorination on Fused Ring Electron Acceptor for Active Layer Morphology, Exciton Dissociation, and Charge Recombination in Organic Solar Cells

Author

Hou, Licheng, primary, Lv, Jie, additional, Wobben, Friso, additional, Le Corre, Vincent M., additional, Tang, Hua, additional, Singh, Ranbir, additional, Kim, Min, additional, Wang, Fufang, additional, Sun, Haitao, additional, Chen, Wenjing, additional, Xiao, Zhengguo, additional, Kumar, Manish, additional, Xu, Tongle, additional, Zhang, Weimin, additional, McCulloch, Iain, additional, Duan, Tainan, additional, Xie, Huling, additional, Koster, L. Jan Anton, additional, Lu, Shirong, additional, and Kan, Zhipeng, additional

Published
2020
Full Text
View/download PDF

34. Can Ferroelectricity Improve Organic Solar Cells?

Author

Abdu‐Aguye, Mustapha, primary, Doumon, Nutifafa Y., additional, Terzic, Ivan, additional, Dong, Jingjin, additional, Portale, Giuseppe, additional, Loos, Katja, additional, Koster, L. Jan Anton, additional, and Loi, Maria Antonietta, additional

Published
2020
Full Text
View/download PDF

37. 15.34% efficiency all-small-molecule organic solar cells with an improved fill factor enabled by a fullerene additive

Author

Hu, Dingqin, primary, Yang, Qianguang, additional, Chen, Haiyan, additional, Wobben, Friso, additional, Le Corre, Vincent M., additional, Singh, Ranbir, additional, Liu, Tao, additional, Ma, Ruijie, additional, Tang, Hua, additional, Koster, L. Jan Anton, additional, Duan, Tainan, additional, Yan, He, additional, Kan, Zhipeng, additional, Xiao, Zeyun, additional, and Lu, Shirong, additional

Published
2020
Full Text
View/download PDF

40. 3D simulations of organic solar cells

Author

Bartesaghi, Davide, Van Der Kaap, Niels, Koster, L. Jan Anton, Como, Enrico Da, Angelis, Filippo De, Snaith, Henry, Walker, Alison, and Photophysics and OptoElectronics

Subjects
Organic solar cell, Computer science, Photovoltaic system, Electronic engineering, Kinetic Monte Carlo, Focus (optics), Engineering physics
Abstract

Drift-diffusion (DD) and Kinetic Monte Carlo (KMC) simulations are commonly used methods for understanding the physics of organic photovoltaic devices. While DD methods have been successfully employed to model and explain device characteristics, KMC simulations open up the possibility to investigate the fundamental processes involved in the operation of solar cells. In this chapter, we give a description of two- and three-dimensional (2D and 3D) DD and KMC simulations. Going beyond one-dimensional simulation techniques allows for a better description of device operation and for a deeper understanding of more fundamental processes. After briefly introducing the basic processes involved in the operation of organic photovoltaic devices, we present an overview of DD and KMC techniques, including some of the technical challenges in the implementation of 2D and 3D simulations. Finally, we compare some results of DD and KMC simulations; in doing so, we particularly focus on the use of 2D and 3D simulations to clarify the impact of the active layer morphology on device efficiency.

Published
2016

Catalog

Books, media, physical & digital resources
See catalog results