物理化学学报 >> 2014, Vol. 30 >> Issue (10): 1861-1866.doi: 10.3866/PKU.WHXB201408044

电化学和新能源 上一篇    下一篇

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

朱德华1, 钟蓉1, 曹宇1, 彭志辉1, 冯爱新1, 向卫东2, 赵家龙1   

  1. 1. 温州大学机电工程学院, 激光制造技术与装备重点实验室, 浙江温州 325035;
    2. 温州大学化学与材料工程学院, 浙江温州 325035
  • 收稿日期:2014-04-30 修回日期:2014-07-28 发布日期:2014-09-30
  • 通讯作者: 赵家龙 E-mail:zhaojl@wzu.edu.cn
  • 基金资助:

    国家自然科学基金(61405147,11274304,51375348)及浙江省教育厅科研项目(Y201430387)资助

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. 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).

摘要:

研究了CuInS2(CIS)量子点敏化太阳能电池(QDSSCs)的电子注入和器件性能与粒子尺寸之间的依赖关系. 首先合成了不同尺寸的CuInS2量子点(QDs),制备了CuInS2量子点敏化的TiO2薄膜,并组装了量子点敏化太阳能电池. 通过循环伏安法确定了CuInS2量子点的能级位置. 采用时间分辨荧光光谱分析测量了CuInS2量子点到TiO2薄膜的电子转移速率和效率. 结果发现,随着粒子尺寸从4.0 nm减小到2.5 nm,电子注入速率略微增加而电子注入效率减小,同时量子点敏化太阳能电池的开路电压基本不变,而光电转换效率、短路电流和填充因子(FF)均减小. 上述研究结果表明量子点敏化太阳能电池性能的优化可以通过改变量子点的尺寸来实现.

关键词: 量子点敏化太阳能电池, CuInS2量子点, 电子转移, 荧光寿命, 时间分辨荧光光谱

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

MSC2000: 

  • O649