Dresden 2017 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 38: Fundamentals of Perovskite Photovoltaics V (joint session CPP/DS/HL)

CPP 38.4: Talk

Wednesday, March 22, 2017, 11:15–11:30, ZEU 250

Polarization of Methylammonium Lead Halide Perovskite Films on Microstructured Arrays — •Martina Stumpp^1,3, Raffael Ruess^1,3, Jan Muessener^2,3, and Derck Schlettwein^1,3 — 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(I_3−xCl_x)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.