期刊
IEEE JOURNAL OF PHOTOVOLTAICS
卷 5, 期 1, 页码 401-405出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOTOV.2014.2364115
关键词
Photoluminescence; semiconductor devices; solar energy
资金
- Sumitomo Electric Industries Group CSR foundation
- JST-PRESTO
- JST-CREST
Photoelectronic responses of organic-inorganic hybrid perovskite CH3NH3PbI3 on mesoporous TiO2 electrodes are investigated. On the basis of near-band-edge optical absorption and photoluminescence spectra, the bandgap energy and exciton binding energy as a function of temperature are obtained. The exciton binding energy is much smaller than thermal energy at room temperature, which means that most excitons are thermally dissociated, and optical processes are determined by the photoexcited electrons and holes. We determined the temperature dependence of exciton binding energy, which changes from similar to 30 meV at 13 K to 6 meV at 300 K. In addition, the bandgap energy and the exciton binding energy show abrupt changes at 150 K due to structural phase transition. Our fundamental optical studies provide essential information for improving the device performance of solar cells based on halide perovskite semiconductors.
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