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Influence of Mixed Organic Cations on the Structural and Optical Properties of Lead Tri-Iodide Perovskites

Abstract

Perovskites with mixed organic cations possess better properties in some aspects compared to their pure counterparts. However, the investigation of structural and optical properties for these mixed-type perovskites is scarce. In this work, probable structures of mixed organic cation perovskites MAxFA1-xPbI3 (x = 1, 0.8, 0.6, 0.4 and 0.2) are comparatively discussed. A saturation of excitonic emission at 1.66 eV indicates limited orthorhombic phase at 30 K in MAPbI3, which confirms the co-existence of orthorhombic and tetragonal phases at low temperature. Based on the comprehensive temperature and power dependent measurements, it is found that defects are activated in mixed organic cation perovskites under low excitation power at room temperature, while no such process is observed in pure MAPbI3. Under high excitation power, free exciton recombination is suppressed due to the exciton-exciton interaction for all samples. Analysis of stability against temperature based on these photoemission processes shows that the structure with comparable organic cation proportion is more stable, which could be explained by uniformly distributed strains existing at boundaries between MAPbI3 and FAPbI3 molecules. These analyses of structural and optical properties for mixed organic cation perovskites are meaningful in dictating future optoelectronic devices.

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Publication details

The article was received on 04 Dec 2018, accepted on 28 Dec 2018 and first published on 02 Jan 2019


Article type: Paper
DOI: 10.1039/C8NR09795J
Citation: Nanoscale, 2019, Accepted Manuscript
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    Influence of Mixed Organic Cations on the Structural and Optical Properties of Lead Tri-Iodide Perovskites

    G. Pang, X. Lan, R. Li, Z. He and R. Chen, Nanoscale, 2019, Accepted Manuscript , DOI: 10.1039/C8NR09795J

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