Proceedings of International Conference on Perovskite and Organic Photovoltaics and Optoelectronics (IPEROP19)
DOI: https://doi.org/10.29363/nanoge.iperop.2019.079
Publication date: 23rd October 2018
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 study and device application. We have been focusing on the fabrication control of perovskite in vacuum by laser deposition method [1] and 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 of crystallization dynamics analysis during laser deposition process or perovskite.
Using laser deposition method, material-supply rate of CH3NH3I and PbI2 was well controlled, which is beneficial for the crystallization control of perovskite. We succeeded in the epitaxial growth of CH3NH3PbI3 on rubrene single crystal, where CH3NH3PbI3 oriented commensurate along with the rubrene crystal direction and atomically flat surface was constructed. The benefit of laser deposition method for perovskite fabrication was demonstrated. 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, PbI2 film was deposited on glass substrate and c-axis oriented crystal was observed. CH3NH3I was supplied on the film and CH3NH3PbI3 perovskite was constructed, where its [1 1 0] axis was oriented perpendicular to the substrate. Based on this analysis, transition of crystal orientation can be discussed.
This work is financially supported by NEDO, JST, and JSPS.
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