Band alignment by ternary crystalline potential-tuning interlayer for efficient electron injection in quantum dot-sensitized solar cells

被引：27

作者：

Chen, Zhenhua ^{[1
]}

Peng, Wenqin ^{[1
]}

Zhang, Kun ^{[1
]}

Zhang, Jing ^{[1
]}

Yang, Xudong ^{[1
]}

Numata, Youhei ^{[1
]}

Han, Liyuan ^{[1
,2
]}

机构：

[1] Natl Inst Mat Sci, Photovolta Mat Unit, Tsukuba, Ibaraki 3050047, Japan

[2] Shanghai Jiao Tong Univ, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China

来源：

JOURNAL OF MATERIALS CHEMISTRY A | 2014年 / 2卷 / 19期

基金：

日本科学技术振兴机构;

关键词：

CHARGE-TRANSFER; SEMICONDUCTOR; SIZE; TRANSPORT;

D O I：

10.1039/c3ta15435a

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：

We developed a facile way to enhance electron injection efficiency in CdSe based quantum dot-sensitized solar cells (QDSCs) by introducing a potential-tuning interlayer composed of ternary CdS1-xSex quantum dots (QDs) between TiO2 film and CdSe QDs. A suitable band structure for electron injection was obtained when the composition of Se was 0.43 in the CdS1-xSex interlayer. The TiO2/CdS0.57Se0.43/CdSe QDSCs achieved a photocurrent density 17.8% higher than conventional TiO2/CdS/CdSe QDSCs. The enhanced performance is owing to the tuned energetic driving force simultaneously adequate for both exciton dissociation at CdS1-xSex/CdSe interface and electron injection at TiO2/CdS1-xSex interface. The electron injection also benefited probably from reducing the lattice mismatch between TiO2 film and CdSe QDs by inserting a crystalline CdS1-xSex interlayer. Our findings indicate that introducing a ternary crystalline potential-tuning interlayer with specifically designed band alignment is a promising strategy to enable efficient electron injection in QDSCs.

引用

页码：7004 / 7014

页数：11

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