Hybrid lead halide perovskite possesses attractive properties and outstanding performance. The electronic structure of hybrid lead halide perovskite single crystal can be used to comprehend its intrinsic properties. In this study, the crystal structure of CH3NH3PbBr3 perovskite crystal was elucidated by transmission electron microscopy. Phonon modes and CH3NH3+ rocking modes were analyzed. Band gaps of the crystal were obtained by temperature-dependent Raman scattering spectroscopy and photoluminescence measurement. Surface potential measurement for a (001) plane exhibited a work function of the material and other phases of PbBr2 and CH3NH3Br. From experimentally determined values, an electronic structure of CH3NH3PbBr3 was built. It showed a p-type characteristic.
Bibliographical noteFunding Information:
This research was supported by grants (2014R1A1A4A01004404, 2016R1D1A1B01009032, and 2017R1D1A1B03034293) of the Basic Science Research Program and the Priority Research Centers Program (2009-0093818) through the National Research Foundation (NRF) funded by the Ministry of Education, Republic of Korea. This work was also supported by the Technology Development Program to solve Climate Changes of the National Research Foundation (NRF) funded by the Ministry of Science, ICT & Future Planning (2016M1A2A2936753 and 2016M1A2A29366784).
© 2017 American Chemical Society.