Optical and Conduction Characteristics of Methylammonium Lead Halides for Understanding Carrier-type and Electronic Structure
William Jo a, Seokhyun Yoon a, Trang Thi Thu Nguyen 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
Oral, Hye Ri Jung, presentation 105
Publication date: 7th November 2016

Organic-inorganic lead halide based perovskite, CH3NH3Pb(Br,I)3, have risen to prominence with regards for their intimate physical properties. Most studies of all, examination on high photo-conversion efficiency thin-films are proceeded to comprehend the conducting characteristics. Grain growth behavior in perovksite is not fully controlled in terms of compositions, textures, and even believed as a trapping source of ionic migration. We investigated perovskite thin-films grown on TiO2 mesoscopic or planar bottom electrodes for the distribution of surface electric potential and current transport by Kelvin probe force microscopy and conductive atomic force microscopy respectively. Surface potentials of iodide and bromide films exhibit distribution around 4.4 eV and 4.6 eV, respectively. Current level of the mono-grain is small but some spots exhibit large current values at high external voltage bias. We also measured its photoluminescence and temperature dependent resistivity in order to estimate electronic structure and transport behaviors of the perovskite thin-films. Consolidated information of the band gap and workfunction will provide a schematic picture on the electronic structure of the perovskite materials. 

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