Engineering Auger recombination in colloidal quantum dots via dielectric screening

Hou, Xiaoqi; Kang, Jun; Qin, Haiyan; Chen, Xuewen; Ma, Junliang; Zhou, Jianhai; Chen, Liping; Wang, Linjun; Wang, Lin-Wang; Peng, Xiaogang

doi:10.1038/s41467-019-09737-2

Engineering Auger recombination in colloidal quantum dots via dielectric screening

Journal Article · Mon Apr 15 04:00:00 EDT 2019 · Nature Communications

DOI:https://doi.org/10.1038/s41467-019-09737-2· OSTI ID:1546670

Hou, Xiaoqi ^[1]; ^[2]; ^[1]; Chen, Xuewen ^[3]; Ma, Junliang ^[1]; Zhou, Jianhai ^[1]; Chen, Liping ^[1]; ^[1]; Wang, Lin-Wang ^[2]; ^[1]

Zhejiang Univ., Hangzhou (China).
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Huazhong Univ. of Science and Technology, Wuhan (China)

Auger recombination is the main non-radiative decay pathway for multi-carrier states of colloidal quantum dots, which affects performance of most of their optical and optoelectronic applications. Outstanding single-exciton properties of CdSe/CdS core/shell quantum dots enable us to simultaneously study the two basic types of Auger recombination channels-negative trion and positive trion channels. Though Auger rates of positive trion are regarded to be much faster than that of negative trion for II-VI quantum dots in literature, our experiments find the two rates can be inverted for certain core/shell geometries. This is confirmed by theoretical calculations as a result of geometry-dependent dielectric screening. By varying the core/shell geometry, both types of Auger rates can be independently tuned for ~1 order of magnitude. Experimental and theoretical findings shed new light on designing quantum dots with necessary Auger recombination characteristics for high-power light-emitting-diodes, lasers, single-molecular tracking, super-resolution microscope, and advanced quantum light sources.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1546670

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 10; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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