Dresden 2017 – wissenschaftliches Programm
CPP 38.4: Vortrag
Mittwoch, 22. März 2017, 11:15–11:30, ZEU 250
Polarization of Methylammonium Lead Halide Perovskite Films on Microstructured Arrays — •Martina Stumpp1,3, Raffael Ruess1,3, Jan Muessener2,3, and Derck Schlettwein1,3 — 1Justus-Liebig-University Giessen, Institute of Applied Physics — 2Justus-Liebig-University Giessen, 1st Physics Institute — 3Justus-Liebig-University Giessen, Laboratory for Materials Science
Despite the great advances of methylammonium lead halide perovskites in photovoltaics, many properties such as the I-V hysteresis of such films are not fully understood and, therefore, need detailed investigation. In the current study, CH3NH3PbI3 and CH3NH3Pb(I3−xClx)3 films were prepared on microstructured gold or platinum electrode arrays on SiO2/Si wafers in order to use symmetric contacts and widely inert substrates. The perovskite films were poled with high voltages and the current was measured under variation of ambient parameters and analyzed in detail. Following the poling of the samples, voltage sweeps were performed. The I-V characteristics during these sweeps showed clearly that the perovskite films were polarized and that the polarization had a persistent character. Additionally, different hysteresis characteristics were observed. The origin of regular and inverted characteristics will be discussed.