Journal article
Control of Hot Carrier Relaxation in CsPbBr3 Nanocrystals Using Damping Ligands
Peng Zeng, Xinjian Ren, Linfeng Wei, Haifeng Zhao, Xiaochun Liu, Xinyang Zhang, Yanmin Xu, Lihe Yan, Klaus Boldt, Trevor A Smith, Mingzhen Liu
Angewandte Chemie International Edition | Wiley | Published : 2022
Abstract
In photon-conversion processes, rapid cooling of photo-induced hot carriers is a dominant energy loss channel. We herein report a 3-fold reduced hot carrier cooling rate in CsPbBr3 nanocrystals capped with a cross-linked polysiloxane shell in comparison to single alkyl-chain oleylamine ligands. Relaxation of hot charge carriers depends on the carrier-phonon coupling (CPC) process as an important channel to dissipate energies in nanostructured perovskite materials. The CPC strengths in the two samples were measured through cryogenic photoluminescence spectroscopic measurements. The effect of organic ligands on the CPC in CsPbBr3 nanocrystals is elucidated based on a damped oscillation model. ..
View full abstractGrants
Awarded by National Key R&D Program of China
Awarded by National Natural Science Foundation of China
Awarded by Special Program for Sichuan Youth Science and Technology Innovation Research Team
Awarded by Fundamental Research Funds for the Central Universities of China
Awarded by Australian Research Council Centre of Excellence in Exciton Science
Funding Acknowledgements
This work was supported by the National Key R&D Program of China (2017YFA0207400), the National Natural Science Foundation of China (61905037 and 62104027), the Special Program for Sichuan Youth Science and Technology Innovation Research Team (2019JDTD0006), and the Fundamental Research Funds for the Central Universities of China (ZYGX2019 J028). K.B. acknowledges support by the Zukunftskolleg Konstanz through a 5-Year Research Fellowship. T.A.S. acknowledges support by the Australian Research Council Centre of Excellence in Exciton Science (CE170100026).