Variation of Open-Circuit Voltage by Electrical Polarization in Hybrid Perovskite Absorber Solar Cells
William Jo a, Hye-Jin Jin a, Juran Kim a, Bich Phuong Nguyen a, Hye Ri Jung a
a Ewha Womans University, 52, Ewhayeodae-gil, Seodaemun-gu, Seoul, 120, Korea, Republic of
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics (AP-HOPV17)
Yokohama-shi, Japan, 2017 February 2nd - 4th
Organizers: Tsutomu Miyasaka and Iván Mora-Seró
Poster 104
Publication date: 7th November 2016

Hybrid lead halide perovksite, MAPbX3(MA=CH3NH3+, X=Br- or I-) emerged with remarkable efficiency increasing and examination on its physical properties are of particular concern. One of the issues is hysteresis phenomenon in current-voltage characteristics. Current-voltage curves tend to show a strong dependence on the sweep rate and direction. Several mechanisms have been proposed including difference in trapping efficiency, ion migration, imbalance between electron and hole fluxes into an electron transfer layer and a hole transfer layer, and ferroelectricity or spontaneous polarization of the perovskites. We report our observations on the non-free charge behaviors in the thin films by measuring piezoelectric responses using piezoelectric force microscopy. In addition, we verify the details of the crystal structure in terms of configuration of the methylammonium ligands. We propose a device model to enhance charge transfer through increasing open circuit voltage in the perovskite solar cells when we have a preferred polarization in the materials.

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