Coulomb-Enhanced Radiative Recombination of Biexcitons in Single Giant-Shell CdSe/CdS Core/Shell Nanocrystals

被引：23

作者：

Hiroshige, Nao ^{[1
]}

Ihara, Toshiyuki ^{[1
]}

Saruyama, Masaki ^{[1
]}

Teranishi, Toshiharu ^{[1
]}

Kanemitsu, Yoshihiko ^{[1
]}

机构：

[1] Kyoto Univ, Inst Chem Res, Uji, Kyoto 6110011, Japan

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2017年 / 8卷 / 09期

关键词：

SEMICONDUCTOR QUANTUM DOTS; AUGER RECOMBINATION; FLUORESCENCE INTERMITTENCY; COLLOIDAL NANOCRYSTALS; SPECTRAL DIFFUSION; EMISSION; EXCITON; BLINKING; INTERFACE; NANORODS;

D O I：

10.1021/acs.jpclett.7b00547

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Giant-shell CdSe/CdS core/shell nanocrystals have attracted much attention due to their unique quasi-type-II band alignment, where a large valence band offset confines holes strongly to the core but electrons are delocalized due to a small conduction band offset. Here, we report the observation of the relative enhancement in the radiative recombination rate of a biexciton compared to that of an exciton in giant-shell CdSe/CdS nanocrystals. We found a clear correlation between the shell thickness of the CdSe/CdS nanocrystals and the ratio between the radiative recombination rates of the biexciton and exciton. Our finding can be explained by a picture in which the biexciton emission efficiency is enhanced through electron localization around the core due to the strong Coulomb potential of the two holes confined in the core.

引用

页码：1961 / 1966

页数：6

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