Crystal Growth Control and Real-Time Analysis of Organolead-Halide Perovskite
Tetsuhiko Miyadera a, Yuto Auchi b, Kohei Yamamoto a, Noboru Ohashi a, Tomoyuki Koganezawa c, Hiroyuki Yaguchi b, Yuji Yoshida a, Masayuki Chikamatsu a
a National institute of Advanced Industrial Science and Technology (AIST)
b Saitama University, 255 Shimo-Okubo, Sakura, Saitama, 338, Japan
c Japan Synchrotron Radiation Research Institute (JASRI)
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP20)
Tsukuba-shi, Japan, 2020 January 20th - 22nd
Organizers: Michio Kondo and Takurou Murakami
Poster, Tetsuhiko Miyadera, 088
Publication date: 14th October 2019

Perovskite solar cells have been attracting increasing attention during half a decade. The control of the crystal structure and analysis of crystallization dynamics of perovskite is very important research topic from the both standpoint of fundamental analysis and device application. We have been focusing on the fabrication control of perovskite in vacuum by laser deposition method [1]. The use of laser for the deposition of CH3NH3I is beneficial for the deposition-rate control. We also conducted crystallization dynamics analysis of perovskite by grazing incident X-ray diffraction (GIXD) at SPring-8 [2]. In this presentation, we would like to report our recent research results for crystallization control and real-time analysis of CH3NH3PbI3 perovskite deposition.

We designed special vacuum chamber where laser deposition and GIXD measurement can be conducted simultaneously. The chamber was installed at BL46XU in SPring-8 and crystallization dynamics of the deposition process of perovskite was analyzed. Firstly, we found that alternative deposition process, where PbI2 and CH3NH3I were deposited alternatively, results in c-axis oriented perovskite crystal. Additionally, in the PbI2 deposition process, Laue oscillation was observed, which represents the construction of smooth surface. Crystallization dynamics from PbI2 to CH3NH3PbI3 was observed including lattice constant change during the reaction. These results provide the insights into the understanding the perovskite deposition process.

This work is financially supported by NEDO, JST, and JSPS.

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