Search Results - "Wuerfel, Uli"

A Planar Copolymer for High Efficiency Polymer Solar Cells by Qin, Ruiping, Li, Weiwei, Li, Cuihong, Du, Chun, Veit, Clemens, Schleiermacher, Hans-Frieder, Andersson, Mattias, Bo, Zhishan, Liu, Zhengping, Inganäs, Olle, Wuerfel, Uli, Zhang, Fengling

“…An alternating copolymer, poly(2-(5-(5,6-bis(octyloxy)-4-(thiophen-2-yl)benzo[c][1,2,5]thiadiazol-7-yl)thiophen-2-yl)-9-octyl-9H-carbazole) (HXS-1), was…”
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Charge Carrier Separation in Solar Cells by Wurfel, Uli, Cuevas, Andres, Wurfel, Peter

“…The selective transport of electrons and holes to the two terminals of a solar cell is often attributed to an electric field, although well-known physics…”
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Impact of charge transport on current–voltage characteristics and power-conversion efficiency of organic solar cells by Würfel, Uli, Neher, Dieter, Spies, Annika, Albrecht, Steve

“…This work elucidates the impact of charge transport on the photovoltaic properties of organic solar cells. Here we show that the analysis of current–voltage…”
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Employing 2D‐Perovskite as an Electron Blocking Layer in Highly Efficient (18.5%) Perovskite Solar Cells with Printable Low Temperature Carbon Electrode by Zouhair, Salma, Yoo, So‐Min, Bogachuk, Dmitry, Herterich, Jan Philipp, Lim, Jaekeun, Kanda, Hiroyuki, Son, Byoungchul, Yun, Hyung Joong, Würfel, Uli, Chahboun, Adil, Nazeeruddin, Mohammad Khaja, Hinsch, Andreas, Wagner, Lukas, Kim, Hobeom

“…Interface engineering and passivating contacts are key enablers to reach the highest efficiencies in photovoltaic devices. While printed carbon–graphite back…”
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On the Impact of Contact Selectivity and Charge Transport on the Open‐Circuit Voltage of Organic Solar Cells by Spies, Annika, List, Mathias, Sarkar, Tanmoy, Würfel, Uli

“…The selectivity of electrodes of solar cells is a critical factor that can limit the overall efficiency. If the selectivity of an electrode is not sufficient…”
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Correct determination of charge transfer state energy from luminescence spectra in organic solar cells by List, Mathias, Sarkar, Tanmoy, Perkhun, Pavlo, Ackermann, Jörg, Luo, Chieh, Würfel, Uli

“…Generation and recombination of electrons and holes in organic solar cells occurs via charge transfer states located at the donor/acceptor interface. The…”
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In Situ Formation of MoO3 in PEDOT:PSS Matrix: A Facile Way to Produce a Smooth and Less Hygroscopic Hole Transport Layer for Highly Stable Polymer Bulk Heterojunction Solar Cells by Shao, Shuyan, Liu, Jian, Bergqvist, Jonas, Shi, Shengwei, Veit, Clemens, Würfel, Uli, Xie, Zhiyuan, Zhang, Fengling

“…A solution‐processed neutral hole transport layer is developed by in situ formation of MoO3 in aqueous PEDOT:PSS dispersion (MoO3‐PEDOT:PSS). This…”
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Phenothiazine‐Based Donor–Acceptor Polymers as Multifunctional Materials for Charge Storage and Solar Energy Conversion by Wessling, Robin, Delgado Andrés, Rodrigo, Morhenn, Isabel, Acker, Pascal, Maftuhin, Wafa, Walter, Michael, Würfel, Uli, Esser, Birgit

“…The increasing energy demand for diverse applications requires new types of devices and materials. Multifunctional materials that can fulfill different roles…”
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Ethanedithiol Treatment of Solution-Processed ZnO Thin Films: Controlling the Intragap States of Electron Transporting Interlayers for Efficient and Stable Inverted Organic Photovoltaics by Bai, Sai, Jin, Yizheng, Liang, Xiaoyong, Ye, Zhizhen, Wu, Zhongwei, Sun, Baoquan, Ma, Zaifei, Tang, Zheng, Wang, Jianpu, Würfel, Uli, Gao, Feng, Zhang, Fengling

“…The surface defects of solution‐processed ZnO films lead to various intragap states. When the solution‐processed ZnO films are used as electron transport…”
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Determination of Free Charge Carrier Luminescence and Quasi‐Fermi Level Separation in Organic Solar Cells via Transient Photoluminescence Measurements by List, Mathias, Faisst, Jared, Heinz, Friedemann, Würfel, Uli

“…Abstract The detection of photoluminescence (PL) is extremely valuable for photovoltaic technologies as it provides direct information about the free charge…”
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Perovskite Solar Cells with Carbon‐Based Electrodes – Quantification of Losses and Strategies to Overcome Them by Bogachuk, Dmitry, Yang, Bowen, Suo, Jiajia, Martineau, David, Verma, Anand, Narbey, Stephanie, Anaya, Miguel, Frohna, Kyle, Doherty, Tiarnan, Müller, David, Herterich, Jan P., Zouhair, Salma, Hagfeldt, Anders, Stranks, Samuel D., Würfel, Uli, Hinsch, Andreas, Wagner, Lukas

“…Carbon‐based electrodes represent a promising approach to improve stability and up‐scalability of perovskite photovoltaics. The temperature at which these…”
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Charge Extraction in Flexible Perovskite Solar Cell Architectures for Indoor Applications – with up to 31% Efficiency by Teixeira, Cristina, Spinelli, Pierpaolo, Castriotta, Luigi Angelo, Müller, David, Öz, Senol, Andrade, Luísa, Mendes, Adélio, Carlo, Aldo Di, Würfel, Uli, Wojciechowski, Konrad, Forgács, Dávid

“…Perovskite Solar Cells (PSCs) are well known for their high efficiencies under 1 sun (AM1.5G), however, PSC can also generate power by harvesting the low‐light…”
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New Fullerene Derivative as an n‐Type Material for Highly Efficient, Flexible Perovskite Solar Cells of a p‐i‐n Configuration by Ahmad, Taimoor, Wilk, Barbara, Radicchi, Eros, Fuentes Pineda, Rosinda, Spinelli, Pierpaolo, Herterich, Jan, Castriotta, Luigi Angelo, Dasgupta, Shyantan, Mosconi, Edoardo, De Angelis, Filippo, Kohlstädt, Markus, Würfel, Uli, Di Carlo, Aldo, Wojciechowski, Konrad

“…Metal halide perovskites have raised huge excitement in the field of emerging photovoltaic technologies. The possibility of fabricating perovskite solar cells…”
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Ultra‐Stable ITO‐Free Organic Solar Cells and Modules Processed from Non‐Halogenated Solvents under Indoor Illumination by Müller, David, Jiang, Ershuai, Campos Guzmán, Laura, Rivas Lázaro, Paula, Baretzky, Clemens, Bogati, Shankar, Zimmermann, Birger, Würfel, Uli

“…Organic Photovoltaics (OPV) is a very promising technology to harvest artificial illumination and power smart devices of the Internet of Things (IoT)…”
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Identifying the Impact of Surface Recombination at Electrodes in Organic Solar Cells by Means of Electroluminescence and Modeling by Reinhardt, Jens, Grein, Maria, Bühler, Christian, Schubert, Martin, Würfel, Uli

“…This work reports on combining current‐voltage characteristics, electroluminescence (EL) measurements, and modeling to identify the selectivity of the…”
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The physical meaning of charge extraction by linearly increasing voltage transients from organic solar cells by Hanfland, Robert, Fischer, Martin A., Brütting, Wolfgang, Würfel, Uli, MacKenzie, Roderick C. I.

“…Carrier mobility in organic solar cells is almost exclusively determined with the Charge Extraction by Linearly Increasing Voltage (CELIV) technique; indeed…”
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Ion Movement Explains Huge VOC Increase despite Almost Unchanged Internal Quasi‐Fermi‐Level Splitting in Planar Perovskite Solar Cells by Herterich, Jan, Unmüssig, Moritz, Loukeris, Georgios, Kohlstädt, Markus, Würfel, Uli

“…Light soaking under “1 sun” is performed on planar p–i–n perovskite solar cells with a Cs0.05MA0.10FA0.85Pb(I0.95Br0.05)3 absorber while measuring current and…”
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Direct Determination of the Steady State and Time‐Resolved Quasi‐Fermi Level Separation in Organic Solar Cells from Electroluminescence Measurements by Faisst, Jared, List, Mathias, Heinz, Friedemann, Würfel, Uli

“…The detection of photoluminescence (PL) is an important characterization method for many photovoltaic technologies providing direct information about the…”
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Surface Modification of ITO with N-Heterocyclic Carbene Precursors Results in Electron Selective Contacts in Organic Photovoltaic Devices by Das, Mowpriya, Kohlstädt, Markus, Enders, Maria, Burger, Stephan, Sasmal, Himadri Sekhar, Zimmermann, Birger, Schäfer, Andreas, Tyler, Bonnie J, Arlinghaus, Heinrich F, Krossing, Ingo, Würfel, Uli, Glorius, Frank

“…Surface modification of indium tin oxide (ITO) electrodes with organic molecules is known to tune their work function which results in higher charge carrier…”
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Low-Power Organic Light Sensor Array Based on Active-Matrix Common-Gate Transimpedance Amplifier on Foil for Imaging Applications by Elsaegh, Samar, Veit, Clemens, Zschieschang, Ute, Amayreh, Mohammad, Letzkus, Florian, Sailer, Holger, Jurisch, Michael, Burghartz, Joachim N., Wurfel, Uli, Klauk, Hagen, Zappe, Hans, Manoli, Yiannos

“…This article presents a 57.6-<inline-formula> <tex-math notation="LaTeX">\mu \text{W} </tex-math></inline-formula> mechanically flexible active-matrix imaging…”
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