Emission Quenching in PbSe Quantum Dot Arrays by Short-Term Air Exposure

被引：49

作者：

Chappell, Helen E. ^{[1
,2
]}

Hughes, Barbara K. ^{[1
,3
]}

Beard, Matthew C. ^{[1
]}

Nozik, Arthur J. ^{[1
,3
]}

Johnson, Justin C. ^{[1
]}

机构：

[1] Natl Renewable Energy Lab, Golden, CO 80401 USA

[2] Univ Colorado, Dept Phys, Boulder, CO 80309 USA

[3] Univ Colorado, Dept Chem & Biochem, Boulder, CO 80309 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2011年 / 2卷 / 08期

关键词：

MULTIPLE EXCITON GENERATION; ELECTRICAL-PROPERTIES; NANOCRYSTAL FILMS; SOLAR-CELLS; RELAXATION; CORE/SHELL; DYE;

D O I：

10.1021/jz2001979

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：

Clear evidence for two emitting states in PbSe nanocrystals (NCs) has been observed. The flow of population between these two states as temperature increases is interrupted by the presence of nonradiative trap states correlated with the exposure of the NC film to air. Quenching of the higher energy emission begins after only seconds of exposure, with the effect saturating after several days. Unlike short-term oxygen related effects in solution, the emission quenching appears to be irreversible, signaling a distinction between surface reactivity in NCs in films and that in solution. The origin of the two emissive centers and the impact of trapping on other NC film properties (e.g., electron/hole mobilities) remain important issues to be resolved.

引用

页码：889 / 893

页数：5

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