Characterization of an abnormal photoluminescence behavior upon crystal-phase transition of perovskite CH3NH3PbI3

Literature Information

Publication Date 2015-05-27
DOI 10.1039/C5CP02605A
Impact Factor 3.676
Authors

Weiguang Kong, Zhenyu Ye, Zhen Qi, Bingpo Zhang, Miao Wang, Arash Rahimi-Iman, Huizhen Wu


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Abstract

Solution-processed hybrid perovskite of CH3NH3PbI3 (MAPbI3) 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 MAPbI3. Both PL and XRD results unambiguously prove the coexistence of the tetragonal and orthorhombic phases of MAPbI3 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 MAPbI3 will benefit the development of new optoelectronic devices.

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