CuInS2量子点敏化太阳能电池中尺寸依赖的电子注入和光电性质

doi:10.3866/PKU.WHXB201408044

Acta Phys. -Chim. Sin. ›› 2014, Vol. 30 ›› Issue (10): 1861-1866.doi: 10.3866/PKU.WHXB201408044

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles Next Articles

Size-Dependent Electron Injection and Photoelectronic Properties of CuInS₂ Quantum Dot Sensitized Solar Cells

ZHU De-Hua¹, ZHONG Rong¹, CAO Yu¹, PENG Zhi-Hui¹, FENG Ai-Xin¹, XIANG Wei-Dong², ZHAO Jia-Long¹

1. Key Laboratory of Laser Manufacturing Technology and Equipment, College of Mechanical and Electrical Engineering, Wenzhou University, Wenzhou 325035, P. R. China;
2. College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, Zhejiang Province, P. R. China

Received:2014-04-30 Revised:2014-07-28 Published:2014-09-30
Contact: ZHAO Jia-Long E-mail:zhaojl@wzu.edu.cn
Supported by:
The project was supported by the National Natural Science Foundation of China (61405147, 11274304, 51375348) and Research Project of Education Department of Zhejiang Province, China (Y201430387).

Abstract

Abstract:

Size-dependent electron injection processes in CuInS₂ (CIS) quantum dot sensitized solar cells (QDSSCs) were studied. CuInS₂ quantum dots (QDs) with various diameters were synthesized and sensitized on TiO₂ films. The energy levels of the CuInS₂ QDs were measured by cyclic voltammetry. The rates and efficiencies of electron transfer from CuInS₂ QDs to TiO₂ films were determined by time-resolved photoluminescence spectroscopy. It was found that the rate of electron injection increased with a decrease in QD size while the efficiency of electron injection decreased. Furthermore, the power conversion efficiency, the short-circuit photocurrent, and the fill factor (FF) of the QDSSCs increased with an increase in QD size. The enhanced performance of the QDSSCs was attributed to the increase in electron injection efficiency. These results indicate that the performance of the QDSSCs could be optimized by varying the size of the QDs.

Key words: Quantum dot sensitized solar cell, CuInS₂ quantum dot, Electron transfer, Photoluminescence lifetime, Time-resolved photoluminescence spectroscopy

ZHU De-Hua, ZHONG Rong, CAO Yu, PENG Zhi-Hui, FENG Ai-Xin, XIANG Wei-Dong, ZHAO Jia-Long. Size-Dependent Electron Injection and Photoelectronic Properties of CuInS₂ Quantum Dot Sensitized Solar Cells[J]. Acta Phys. -Chim. Sin. 2014, 30(10), 1861-1866. doi: 10.3866/PKU.WHXB201408044

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Size-Dependent Electron Injection and Photoelectronic Properties of CuInS₂ Quantum Dot Sensitized Solar Cells

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Size-Dependent Electron Injection and Photoelectronic Properties of CuInS₂ Quantum Dot Sensitized Solar Cells