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HL: Fachverband Halbleiterphysik

HL 76: Poster IIIC

HL 76.10: Poster

Donnerstag, 19. März 2020, 15:00–17:30, P2/4OG

Thermally evaporated two dimensional perovskites for photovoltaic applications — •Zongbao Zhang, Ran Ji, Martin Kroll, Changsoon Cho, Tim Schramm, Frederik Nehm, Yana Vaynzof, and Karl Leo — Dresden Integrated Center for Applied Physics and Photonic Materials, Dresden,Germany

Organic-inorganic hybrid perovskite solar cells have demonstrated remarkable progress recently. Despite their excellent photovoltaic performance, their instability upon exposure to oxygen and moisture remains a critical challenge that needs to be mitigated prior to their commercialization. It has been recently shown that two-dimensional (2D) perovskites exhibit excellent stability, far surpassing that of traditional 3D perovskites. Solar cells with 2D perovskite have recently reached a high efficiency of over 18%. Most commonly, these devices are fabricated via solution processing, which has yet to prove feasibility for industrial mass production, with only very few reports of vacuum evaporated 2D perovskites. Here, we fabricate 2D perovskites ((PEA)2(MA)n-1PbnI3n+1, (PEA)2Csn-1PbnI3n+1) via thermal evaporation and analyze their microstructure, crystallinity and optical properties. We find that the crystal structure of evaporated 2D perovskites is in excellent agreement with previous results reported for solution-processed fabrication. Similarly, the optical properties of the evaporated and solution-processed 2D perovskites are very similar. Our results highlight the efficacy of thermal evaporation as a tool for the formation of 2D perovskites of high electronic quality - a promising route for their integration into a range of optoelectronic applications.