物理化学学报 >> 2015, Vol. 31 >> Issue (7): 1331-1337.doi: 10.3866/PKU.WHXB201505072

电化学和新能源 上一篇    下一篇

耦联剂辅助吸附法制备CuInS2量子点敏化太阳电池

王楠1,2, 梁柱荣2,3, 王欣1,2, 徐雪青2,3, 方军1, 王军霞2,3, 郭华芳2,3   

  1. 1 厦门大学化学与化工学院化工与生物工程系, 福建厦门361005;
    2 中国科学院广州能源研究所, 中国科学院可再生能源与天然气水合物重点实验室, 广州510640;
    3 中国科学院大学, 北京100049
  • 收稿日期:2015-04-13 修回日期:2015-05-07 发布日期:2015-07-08
  • 通讯作者: 徐雪青, 方军 E-mail:Xuxq@ms.giec.ac.cn;jfang@xmu.edu.cn
  • 基金资助:

    国家自然科学基金(21073193, 21273241, 21376195), 广东省教育部产学研结合重大科技专项项目(2012B091100476)及广州市科技计划项目(2014J4100218)资助

CuInS2 Quantum Dot-Sensitized Solar Cells Fabricated via a Linker-Assisted Adsorption Approach

WANG Nan1,2, LIANG Zhu-Rong2,3, WANG Xin1,2, XU Xue-Qing2,3, FANG Jun1, WANG Jun-Xia2,3, GUO Hua-Fang2,3   

  1. 1 Department of Chemical & Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian Province, P. R. China;
    2 Renewable Energy and Gas Hydrate Key Laboratory of Chinese Academy of Sciences, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, P. R. China;
    3 University of Chinese Academy of Sciences, Beijing 100049, P. R. China
  • Received:2015-04-13 Revised:2015-05-07 Published:2015-07-08
  • Contact: XU Xue-Qing, FANG Jun E-mail:Xuxq@ms.giec.ac.cn;jfang@xmu.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21073193, 21273241, 21376195), Project on the Integration of Industry, Education and Research of Guangdong Province, China (2012B091100476), and Science and Technology Research Project of Guangzhou, China (2014J4100218).

摘要:

分别以CuI 和InAc3 作为铜源和铟源, 十二硫醇(DDT)作为硫源, 采用直接加热法合成不同尺寸的CuInS2 (CIS)量子点. 运用X射线衍射(XRD), 拉曼光谱(Raman), 高分辨率透射电镜(HRTEM), 紫外-可见(UVVis)吸收光谱表征其相结构、形貌及光学性能. 结果表明: 制备的CIS量子点为黄铜矿结构, 且随着时间的延长, 量子点逐渐长大, 吸收光谱的激子吸收峰逐渐红移, 表现出量子尺寸效应. 采用巯基乙酸为双功能耦联剂辅助吸附法制备CIS敏化的TiO2薄膜. 通过衰减全反射红外光谱(ATR-FTIR)分析得出, 巯基乙酸上的羧基与TiO2表面羟基连接, 另一端上的巯基代替长链的DDT与CIS 耦联, 将CIS 成功锚定在TiO2表面. 该方法不仅操作简单, 而且容易实现CIS在TiO2表面的吸附. 太阳电池光电性能测试表明, 粒径大小约为3.6 nm的CIS量子点表现出最优的吸附能力以及光电转换性能. 进一步采用连续离子吸附层法对CIS敏化的TiO2薄膜进行CdS包覆, 光电转换性能大大提高, 其效率达到2.83%, 这主要源于CdS的包覆钝化了CIS 的表面缺陷, 有效地降低了电子复合.

关键词: 铜铟硫, 量子点, 敏化太阳电池, 多功能耦联剂, 巯基乙酸, 辅助吸附

Abstract:

Colloidal chalcopyrite CuInS2 (CIS) quantum dots (QDs) were synthesized using copper(I) iodine (CuI) and indium(III) acetate (InAc3) as metal cationic precursors, and dodecanethiol (DDT) as the sulfur source and solvent. The microstructure and optical properties of the prepared CIS QDs were characterized by X-ray diffraction (XRD), Raman spectroscopy, high-resolution transmission electron microscopy (HRTEM), and UVVis absorption spectroscopy. The results showed that the CIS consisted of chalcopyrite phase and exhibited Cu-Au ordering. With prolonged reaction time, the grain sizes of the QDs became larger and the absorption edges of the CIS QDs showed a red-shift owing to the size-induced quantum confinement effect. For the first time, DDT-capped CIS QDs with narrow size distribution were connected to the inner surface of mesoporous TiO2 films via a thioglycolic acid (TGA)-assisted adsorption approach, which was simple and easy to carry out. The adsorption behaviors of both TGA and the CIS QDs on the TiO2 films were detected by attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy. The results indicated that TGA was adsorbed onto the surface of TiO2 via COOH groups while the ―SH group was exposed outside, and replaced DDT at the surface of the CIS QDs, leading to the attachment between TiO2 and CIS. It was revealed that the CIS QDs of ~3.6 nm in size exhibited the best light absorption capacity and photovoltaic performance. An over-coating of CdS significantly improved the performance of the QDS

Key words: CuInS2, Quantum dot, Sensitized solar cell, Bifunctional linker, Thioglycolic acid, Assisted adsorption

MSC2000: 

  • O649