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Control of Hot Carrier Relaxation in CsPbBr<sub>3</sub> Nanocrystals Using Damping Ligands

Control of Hot Carrier Relaxation in CsPbBr3 Nanocrystals Using Damping Ligands

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ZENG, Peng, Xinjian REN, Linfeng WEI, Haifeng ZHAO, Xiaochun LIU, Xinyang ZHANG, Yanmin XU, Lihe YAN, Klaus BOLDT, Trevor A. SMITH, 2022. Control of Hot Carrier Relaxation in CsPbBr3 Nanocrystals Using Damping Ligands. In: Angewandte Chemie. Wiley-Blackwell. 134(15), e202111443. ISSN 0932-2159. eISSN 1521-3757. Available under: doi: 10.1002/ange.202111443

@article{Zeng2022Contr-56356, title={Control of Hot Carrier Relaxation in CsPbBr3 Nanocrystals Using Damping Ligands}, year={2022}, doi={10.1002/ange.202111443}, number={15}, volume={134}, issn={0932-2159}, journal={Angewandte Chemie}, author={Zeng, Peng and Ren, Xinjian and Wei, Linfeng and Zhao, Haifeng and Liu, Xiaochun and Zhang, Xinyang and Xu, Yanmin and Yan, Lihe and Boldt, Klaus and Smith, Trevor A.}, note={Article Number: e202111443} }

Xu, Yanmin 2022 Zeng, Peng terms-of-use Yan, Lihe Zhang, Xinyang Smith, Trevor A. Zhang, Xinyang Liu, Xiaochun Boldt, Klaus 2022-01-26T09:09:38Z Wei, Linfeng Zeng, Peng Xu, Yanmin Zhao, Haifeng Ren, Xinjian Yan, Lihe eng Zhao, Haifeng Ren, Xinjian Wei, Linfeng 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 CsPbBr 3 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 CsPbBr 3 nanocrystals is elucidated based on a damped oscillation model. This supplements the conventional polaron-based CPC model, by involving a damping effect on the CPC from the resistance of the ligands against nanocrystal lattice vibrations. The model also accounts for the observed linear temperature-dependence of the CPC strength. Our work enables predictions about the effect of the ligands on the performance of perovskite nanocrystals in future applications. Smith, Trevor A. 2022-01-26T09:09:38Z Liu, Xiaochun Control of Hot Carrier Relaxation in CsPbBr<sub>3</sub> Nanocrystals Using Damping Ligands Boldt, Klaus

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