Regensburg 2016 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 90: Poster III
HL 90.16: Poster
Thursday, March 10, 2016, 16:00–19:00, Poster A
The influence of fabrication process and substrate material on electrical characteristics of methylammonium lead iodide — •Tim Helder1,2, Christian Mueller1,2,3, Wolfgang Kowalsky1,2,3, and Robert Lovrincic2,3 — 1KIP, Universität Heidelberg, Germany — 2InnovationLab, Heidelberg, Germany — 3IHF, TU Braunschweig, Germany
Research interest in halide perovskites such as CH3NH3PbI3 as photovoltaic materials has increased continuously in the last years due to an increase of solar cell efficiencies to over 20%. This development is even more impressive if we take into account the possibilities in variation of substrates, precursor materials and fabrication methods. Despite all these efforts we still lack in understanding fundamental processes in solar cells based on these materials.
Herein we present Kelvin Probe measurements to investigate the impact of fabrication processes on the work function of CH3NH3PbI3 layers. Therefore we deposited CH3NH3PbI3 by spincoating and vacuum evaporation. Moreover, we varied the process parameters of single process steps (e.g. annealing) as well as the substrate materials (e.g. PEDOT, TiO2, Au). Thereby we are able to directly investigate the impact of single changes in the fabrication process on the electrical behavior of the perovskite layer. We will discuss implications of our results for solar cell performance.