期刊
ACS PHOTONICS
卷 5, 期 6, 页码 2408-2417出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.8b00185
关键词
electroabsorption; lead halide perovskite; photovoltaic cell; electric dipole moment; nonlinear susceptibility
类别
资金
- Center for Interdisciplinary Science of NCTU
- Ministry of Science and Technology of Taiwan [MOST 105-2113-M-009-003, MOST 106-2113-M-009-002, MOST 105-2119-M-009-011-MY3]
- MOST [MOST 107-3017-F009-003]
- Center for Emergent Functional Matter Science of National Chiao Tung University from the Featured Areas Research Center Program within Ministry of Education (MOE) in Taiwan
Electroabsorption (E-A) spectra of lead halide perovskites, that is, CH3NH3PbI3-xBrx (x = 0-3), which show large spectral shift depending on the ratio between iodine and bromide, have been measured. By analyzing E-A spectra with the S. integral method, spectral shape of the absorption spectra for the first exciton band and binding energy of exciton have been determined. Magnitudes of the change in electric dipole moment and molecular polarizability following excitation into the exciton state have been also evaluated in these perovskites. The binding energy of electron and hole in exciton of these materials as well as the magnitude of change in electric dipole moment following exciton absorption is roughly the same, suggesting that the difference of the photoenergy conversion in photovoltaic cells using these materials comes from the difference in light harvesting effect and difference in carrier mobility, not from the difference in carrier generation efficiency. The frequency-dependent third-order nonlinear susceptibility chi((3)) has also been calculated, based on the E-A spectra.
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