Dresden 2020 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 53: Perovskite and photovoltaics II (joint session HL/CPP)
CPP 53.4: Talk
Tuesday, March 17, 2020, 14:45–15:00, POT 251
Lead-free co-evaporated perovskites for photovoltaic applications. — •Tim Schramm, Martin Kroll, Frederik Nehm, Zongbao Zhang, Karl Leo, and Yana Vaynzof — Dresden Integrated Center for Applied Physics and Photonic Materials(IAPP), Technische Universität Dresden
The performance of lead-based perovskites has dramatically increased over the past decade reaching power conversion efficiencies of over 25%. Despite these remarkable advances, lead-based perovskite suffer from serious challenges, most notably lead related toxicity and poor stability, which remain significant obstacles for their integration into industrial applications.
One promising route to circumvent these issues is by turning to novel absorber material systems such as the lead-free double perovskites. Herein, we present our recent results on the formation of Cs2AgBiBr6 perovskites by thermal evaporation. In particular, we employ a triple-source co-evaporation of the precursor materials, followed by thermal annealing and characterize their microstructure, crystallinity and optical properties. We identify processing conditions that lead to high quality crystalline films with large domains and investigate their performance in photovoltaic devices. Our results pave the route for further development of double perovskites for optoelectronic applications.