Dresden 2020 – wissenschaftliches Programm
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CPP 86.4: Vortrag
Donnerstag, 19. März 2020, 10:15–10:30, ZEU 260
Temperature dependence of the spectral linewidth of charge-transfer-state emission in organic solar cells; static vs. dynamic disorder contribution — •Kristofer Tvingstedt1, Johannes Benduhn2, and Koen Vandewal3 — 1Experimental Physics VI, Julius Maximillian University of Würzburg, 97074 Würzburg, Germany — 2Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP) and Institute for Applied Physics, TU Dresden, Nöthnitzer Straße 61, 01187 Dresden, Germany — 3Instituut voor Materiaalonderzoek (IMO), Hasselt University, Wetenschapspark 1, BE-3590 Diepenbeek, Belgium
The origin and impact of energetic disorder remains a topic of intense controversy in the research field of organic photovoltaics (OPV). As the amount of energetic disorder of the photovoltaic material have a pronounced impact on both the open circuit voltage and the effective drift mobility of operational devices, a proper account of its foundation is strongly desired. Currently, both Gaussian and exponential, as well as static and dynamic disorder models are interchangeably being employed. We herein aim to increase the understanding of disorder contribution in organic solar cells by evaluating the spectral width of charge-transfer-state emission as a function of both carrier injection conditions and temperature, with the primary objective to disentangle dynamic and static disorder contribution. Both photoluminescence (PL) and electroluminescence (EL) of a large set of complete devices made of both small molecules and polymers are evaluated under weak injection conditions to shed more light on this topic.