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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 90: Perovskite and photovoltaics V (joint session HL/CPP)

CPP 90.4: Vortrag

Donnerstag, 19. März 2020, 10:15–10:30, POT 251

Differences between vacuum deposition and solution processing of lead halide perovskites — •Martin Kroll, Ran Ji, Zongbao Zhang, Tim Schramm, Changsoon Cho, Frederik Nehm, Yana Vaynzof, and Karl Leo — TU Dresden, IAPP, Nöthnitzer Straße 61, 01187 Dresden

Vacuum deposition is the preparation technique of choice for large scale production of organic thin film solar cells, due to the superior control it offers over film formation and deposition of multilayers. It is also possible to deposit perovskite materials by thermal evaporation, however motivated by its simplicity and low associated costs, most research groups focus on solution processed perovskites. Nevertheless, recent reports show that power conversion efficiencies of vacuum deposited perovskite solar cells surpassed 20%, making them comparable to solution processed devices. The fabrication of perovskite thin films by thermal evaporation in vacuum faces different challenges that solution processing and often results in different film properties. We compare the properties and performance of perovskites fabricated by the two methods and report on the deviations we observe in morphology, stability and photovoltaic device performance. We discuss the influence of processing conditions during vacuum and solution processing on the properties of the perovskites films as well as their effect on the device performance, stability and reproducibility.