Regensburg 2019 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 43: Perovskite and Hybrid Photovolatics II (joint session HL/CPP)

HL 43.5: Talk

Thursday, April 4, 2019, 16:00–16:15, H36

Vacuum-deposited Bismuth and 2D perovskites as absorber material for solar cells — •Martin Kroll, Frederik Nehm, and Karl Leo — TU Dresden, IAPP, Dresden Deutschland

Organic-inorganic halide perovskites are a fast developing absorber material class for thin-film solar cells. The state of the art material combinations with record efficiencies all contain methyl-ammonium (MA) and lead as cations, which both display unfavorable properties. Cells with methyl-ammonium as organic cation all show rapid degradation due to its instability under exposure to light and moisture. Lead is known for its toxicity, which is bound to cause problems during cell marketing and legislation. In order to circumvent these issues, current research discusses less toxic material combinations like MA/Cesium-Bismuth-Iodide as well as self-layering 2D perovskites for better stability, which are formed by introducing large organic cations like butyl-ammonium (BA). So far, these approaches have only been shown using solution processing. We show the prospects of multi-source vacuum evaporation, which excels at material purity and film control. We show first results of multi-source vacuum evaporation of MAPbI3 as well as Cs3Bi2I9. We present XRD and absorption data for thin-films as well as first results for fully vacuum processed solar cells.