Strong Electronic Coupling and Ultrafast Electron Transfer between PbS Quantum Dots and TiO2 Nanocrystalline Films

被引：87

作者：

Yang, Ye ^{[1
]}

Rodriguez-Cordoba, William ^{[1
]}

Xiang, Xu ^{[1
]}

Lian, Tianquan ^{[1
]}

机构：

[1] Emory Univ, Dept Chem, Atlanta, GA 30322 USA

来源：

NANO LETTERS | 2012年 / 12卷 / 01期

基金：

美国国家科学基金会;

关键词：

PbS quantum dots; TiO2 nanocrystalline films; electronic coupling; electron transfer; Newns-Anderson model; solar cells; SENSITIZED SOLAR-CELLS; SMALL SEMICONDUCTOR CRYSTALLITES; OPTICAL-PROPERTIES; RECOMBINATION DYNAMICS; CHARGE RECOMBINATION; EXCITON DISSOCIATION; CDSE NANOCRYSTALS; CARRIER DYNAMICS; METHYLENE-BLUE; THIN-FILMS;

D O I：

10.1021/nl2035783

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Hot carrier and multiple exciton extractions from lead salt quantum dots (QDs) to TiO2 single crystals have been reported. Implementing these ideas on practical solar cells likely requires the use of nanocrystalline TiO2 thin films to enhance the light harvesting efficiency. Here, we report 6.4 +/- 0.4 fs electron transfer time from PbS QDs to TiO2 nanocrystalline thin films, suggesting the possibility of extracting hot carriers and multiple excitons in solar cells based on these materials.

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页码：303 / 309

页数：7

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