Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 90: Poster III
HL 90.11: Poster
Donnerstag, 10. März 2016, 16:00–19:00, Poster A
Impact of gas exposure on electronic properties of methylammonium lead iodide films — •Bernd Epding1,3, Christian Mueller1,2,3, Robert Lovrincic2,3, and Wolfgang Kowalsky1,2,3 — 1Kirchhoff-Institut für Physik, Universität Heidelberg, Germany — 2Institut für Hochfrequenztechnik, TU Braunschweig, Germany — 3Innovation Lab, Heidelberg, Germany
Over the last few years the power conversion efficiency of organometal-halide perovskite (such as CH3NH3PbI3) based solar cells has skyrocketed at an unprecedented rate to values around 20%. This is even more impressive if we take into account that such high efficiencies can be reached for various cell designs, made from different precursor materials, for both solution and vacuum processed absorber layers. Even though very good devices can already be manufactured, the exact mechanisms, which lead to good charge carrier mobility and extraction, are still not fully understood.
We focus in this work on a comparison between perovskite layers (and solar cells based thereon) in different surrounding atmospheres to investigate the role of intercalated water [1]. Scanning Kelvin probe microscopy was performed under different atmospheric conditions. Thereby we are able to map electronic and structural properties with high spatial resolution. Together with IV measurements, this allows us to directly correlate the obtained data to device performance.
[1] C. Mueller et al., Chem. Mater., 2015, 27 (22), p. 7835-7841