Статья

Thermal tolerance of perovskite quantum dots dependent on A-site cation and surface ligand

Shuo WangInstitute of New Energy Material Chemistry, School of Materials Science and Engineering, Nankai University, Tianjin, 300350, ChinaQian ZhaoInstitute of New Energy Material Chemistry, School of Materials Science and Engineering, Nankai University, Tianjin, 300350, China. [email protected]Abhijit HazarikaNational Renewable Energy Laboratory, Golden, CO, 80401, USASimiao LiInstitute of New Energy Material Chemistry, School of Materials Science and Engineering, Nankai University, Tianjin, 300350, ChinaYue WuInstitute of New Energy Material Chemistry, School of Materials Science and Engineering, Nankai University, Tianjin, 300350, ChinaYaxin ZhaiKey Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Department of Physics, Hunan Normal University, Changsha, Hunan, 410081, ChinaXihan ChenSUSTech Energy Institute for Carbon Neutrality, Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, ChinaJoseph M. LutherNational Renewable Energy Laboratory, Golden, CO, 80401, USAGuoran LiInstitute of New Energy Material Chemistry, School of Materials Science and Engineering, Nankai University, Tianjin, 300350, China. [email protected]

2023en

ABI

Аннотация

Abstract A detailed picture of temperature dependent behavior of Cs x FA 1-x PbI 3 perovskite quantum dots across the composition range is constructed by performing in situ optical spectroscopic and structural measurements, supported by theoretical calculations that focus on the relation between A-site chemical composition and surface ligand binding. The thermal degradation mechanism depends not only on the exact chemical composition, but also on the ligand binding energy. The thermal degradation of Cs-rich perovskite quantum dots is induced by a phase transition from black γ-phase to yellow δ-phase, while FA-rich perovskite quantum dots with higher ligand binding energy directly decompose into PbI 2 . Quantum dot growth to form large bulk size grain is observed for all Cs x FA 1-x PbI 3 perovskite quantum dots at elevated temperatures. In addition, FA-rich quantum dots possess stronger electron−longitudinal optical phonon coupling, suggesting that photogenerated excitons in FA-rich quantum dots have higher probability to be dissociated by phonon scattering compared to Cs-rich quantum dots.

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Идентификаторы

DOI: 10.1038/s41467-023-37943-6

Цитирования и источники

Цитирований: 2Использованных источников: 0

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