期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 17, 期 25, 页码 16405-16411出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5cp02605a
关键词
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资金
- National Key Basic Research Program of China [2011CB925603]
- National Natural Science Foundation of China [61290305, 11374259]
Solution-processed hybrid perovskite of CH3NH3PbI3 (MAPbI(3)) exhibits an abnormal luminescence behavior at around the tetragonal-orthorhombic phase transition temperature. The combination of time resolved photoluminescence (PL), variable excitation power PL, and variable-temperature X-ray diffraction (XRD) allows us to clearly interpret the abnormal luminescence features in the phase transition region of MAPbI(3). Both PL and XRD results unambiguously prove the coexistence of the tetragonal and orthorhombic phases of MAPbI(3) in the temperature range of 150 to 130 K. The two luminescence features observed in the orthorhombic phase at T < 130 K originate from free excitons and donor-acceptor-pair (DAP) transitions, respectively. The comprehensive understanding of optical properties upon phase transition in MAPbI(3) will benefit the development of new optoelectronic devices.
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