Organometal Halide Perovskite as Visible-Light Sensitizers for Photovoltaic Cells

　In 2009, Prof. Miyasaka and co-workers reported a novel type solar cell with perovskite materials[1]. The paper, which is now cited for over 8000 times until June 2019 (according to Google Scholar result), has attracted many interests in the world.
　The analysis was carried out at the Segawa Lab in the University of Tokyo. From the energy where the photoelectron emitted, the valence band energy of CH3NH3PbBr3 or CH3NH3PbI3 were calculated as 5.38eV and 5.44eV, respectively. Furthermore, the conductive energy was calculated from the band gap　obtained by photoabsorption measurement and the above valence band energy.
　It was turned out that electrons can be injected from perovskite materials into TiO2. With this result, AC-3 is proved to be so useful that contribute to those novel researches.

Fig.1 Result of WF analysis by AC-3[1].

[1] Akihiro Kojima, Kenjiro Teshima, Yasuo Shirai and Tsutomu Miyasaka,
Organo Metal Halide Perovskites as Visible-Light Sensitizer for Photovoltaic Cells,
J. Am. Chem. Soc., 2009, 131 (17), pp 6050-6051; https://doi.org/10.1021/ja809598r