Illumination dependent carrier dynamics of CH3NH3PbBr3 perovskite

Sheng Chen; Xiaoming Wen; Shujuan Huang; Rui Sheng; Martin A. Green; Anita Ho-Baillie

doi:10.1117/12.2202176

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22 December 2015 Illumination dependent carrier dynamics of CH₃NH₃PbBr₃ perovskite

Sheng Chen, Xiaoming Wen, Shujuan Huang, Rui Sheng, Martin A. Green, Anita Ho-Baillie

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Proceedings Volume 9668, Micro+Nano Materials, Devices, and Systems; 96681R (2015) https://doi.org/10.1117/12.2202176
Event: SPIE Micro+Nano Materials, Devices, and Applications, 2015, Sydney, New South Wales, Australia

Abstract

The excellent light harvesting properties and potentially low cost fabrication of organometal halide perovskites have attracted great attention in their application as solar cell device. Apart from the general advantages of organic-inorganic perovskite, CH₃NH₃PbBr₃ has a larger bandgap (~2.3eV) suitable to be the top cell in a tandem solar device. Here we use steady-state and time-resolved photoluminescence (PL) techniques to investigate the photophysical behaviour of CH₃NH₃PbBr₃ perovskite including its carrier dynamics under continuous illumination. Samples were studied under different illumination conditions and the following observations were made: (1) defect assisted recombination is dominant under low excitation under nano-second scale measurement, (2) bimolecular and Auger recombinations dominate under high excitation under the minute timescale measurement, (3) the magnitude PL decay traces decrease over time under continuous excitation. We propose that both the density of photo-generated free carriers and the density of mobile ions have an impact on the carrier dynamic of CH₃NH₃PbBr₃. This finding provides insights into the photophysical properties of perovskite materials.

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Sheng Chen, Xiaoming Wen, Shujuan Huang, Rui Sheng, Martin A. Green, and Anita Ho-Baillie "Illumination dependent carrier dynamics of CH₃NH₃PbBr₃ perovskite", Proc. SPIE 9668, Micro+Nano Materials, Devices, and Systems, 96681R (22 December 2015); https://doi.org/10.1117/12.2202176

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