Recombination between Photogenerated and Electrode-Induced Charges Dominates the Fill Factor Losses in Optimized Organic Solar CellsClick to copy article linkArticle link copied!
- Uli Würfel*Uli Würfel*E-mail: [email protected]Fraunhofer Institute for Solar Energy Systems ISE, Heidenhofstr. 2, 79110 Freiburg, GermanyFreiburg Materials Research Center FMF, Albert-Ludwigs-Universität Freiburg, Stefan-Meier-Str. 21, 79104 Freiburg, GermanyMore by Uli Würfel
- Lorena Perdigón-ToroLorena Perdigón-ToroInstitut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Straße 24−25, 14476 Potsdam-Golm, GermanyMore by Lorena Perdigón-Toro
- Jona KurpiersJona KurpiersInstitut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Straße 24−25, 14476 Potsdam-Golm, GermanyMore by Jona Kurpiers
- Christian M. WolffChristian M. WolffInstitut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Straße 24−25, 14476 Potsdam-Golm, GermanyMore by Christian M. Wolff
- Pietro CaprioglioPietro CaprioglioInstitut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Straße 24−25, 14476 Potsdam-Golm, GermanyYoung Investigator Group Perovskite Tandem Solar Cells, Helmholtz-Zentrum Berlin, Kekuléstr. 5, 12489 Berlin, GermanyMore by Pietro Caprioglio
- Jeromy James RechJeromy James RechDepartment of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United StatesMore by Jeromy James Rech
- Jingshuai ZhuJingshuai ZhuDepartment of Materials Science and Engineering, College of Engineering, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Peking University, Beijing 100871, ChinaMore by Jingshuai Zhu
- Xiaowei ZhanXiaowei ZhanDepartment of Materials Science and Engineering, College of Engineering, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Peking University, Beijing 100871, ChinaMore by Xiaowei Zhan
- Wei YouWei YouDepartment of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United StatesMore by Wei You
- Safa ShoaeeSafa ShoaeeInstitut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Straße 24−25, 14476 Potsdam-Golm, GermanyMore by Safa Shoaee
- Dieter NeherDieter NeherInstitut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Straße 24−25, 14476 Potsdam-Golm, GermanyMore by Dieter Neher
- Martin Stolterfoht*Martin Stolterfoht*E-mail: [email protected]Institut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Straße 24−25, 14476 Potsdam-Golm, GermanyMore by Martin Stolterfoht
Abstract
![Abstract Image](/cms/10.1021/acs.jpclett.9b01175/asset/images/medium/jz-2019-01175k_0005.gif)
Charge extraction in organic solar cells (OSCs) is commonly believed to be limited by bimolecular recombination of photogenerated charges. However, the fill factor of OSCs is usually almost entirely governed by recombination processes that scale with the first order of the light intensity. This linear loss was often interpreted to be a consequence of geminate or trap-assisted recombination. Numerical simulations show that this linear dependence is a direct consequence of the large amount of excess dark charge near the contact. The first-order losses increase with decreasing mobility of minority carriers, and we discuss the impact of several material and device parameters on this loss mechanism. This work highlights that OSCs are especially vulnerable to injected charges as a result of their poor charge transport properties. This implies that dark charges need to be better accounted for when interpreting electro-optical measurements and charge collection based on simple figures of merit.
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