Facet Engineering for Decelerated Carrier Cooling in Polyhedral Perovskite Nanocrystals

被引：21

作者：

Acharjee, Debopam ^{[1
]}

Das, Ayendrila ^{[1
]}

Panda, Mrinal Kanti ^{[1
]}

Barai, Manas ^{[1
]}

Ghosh, Subhadip ^{[1
,2
,3
]}

机构：

[1] OCC Homi Bhabha Natl Inst HBNI, Natl Inst Sci Educ & Res, Sch Chem Sci, Khurja 752050, Orissa, India

[2] OCC Homi Bhabha Natl Inst HBNI, Natl Inst Sci Educ & Res NISER, Sch Chem Sci, Khurja 752050, Orissa, India

[3] OCC Homi Bhabha Natl Inst HBNI, Natl Inst Sci Educ & Res NISER, Ctr Interdisciplinary Sci CIS, Khurja 752050, Orissa, India

来源：

NANO LETTERS | 2023年 / 23卷 / 05期

关键词：

facet engineering; hot hole extraction; carrier cooling; femtosecond upconversion; polyhedral perovskite nanocrystals; EXCITATION-WAVELENGTH DEPENDENCE; ULTRAFAST INTERFACIAL ELECTRON; PEO TRIBLOCK COPOLYMER; SOLVATION DYNAMICS; HALIDE PEROVSKITES; CSPBBR3; NANOCRYSTALS; COUMARIN DYES; QUANTUM DOTS; EFFICIENT; CSPBX3;

D O I：

10.1021/acs.nanolett.2c05107

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report here the hot carrier (HC) cooling time scales within polyhedral CsPbBr3 nanocrystals (NCs) characterized by different numbers of facets (6 to 26) utilizing a femtosecond upconversion setup. Interestingly, the observed cooling time scale slows many-fold (> 10 times) upon opening the new facets on the NC surface. Furthermore, a temperature-dependent study reveals that cooling in multifaceted NCs is polaron mediated, where newly opened polar facets and the soft lattice of CsPbBr3 NCs play pivotal roles. Our hallmark result of slow cooling in polyhedral NCs renders an excellent opportunity for harvesting high-energy carriers by a carefully chosen molecular system. To this end, employing the hole scavenger molecule aniline, we successfully extracted hot holes from optically pumped NCs. We believe that several intriguing properties of the polyhedral NCs, including rapid polaron formation, defect-tolerant nature, and the capability of soft lattice to support slow diffusion of charge carriers, resulted in decelerated cooling.

引用

页码：1946 / 1953

页数：8

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