摘要:近年来，纳米技术的快速发展推动了生物、医药和微电子材料的进步，特别是新能源家族成员——薄膜太阳能电池的迅速发展。发展出了例如Ⅲ-Ⅳ族化合物太阳能电池、铜铟镓硒(CIS/CIGS)薄膜太阳能电池和染料敏化太阳能电池(DSSC)等多种类型的薄膜太阳能电池。Cu-Bi-S体系与CIS/CIGS系半导体材料拥有类似的结构和光电性质，成本更低，制备技术简单，也更为环保，因而受到了各界的广泛关注。61958

本论文针对Cu3BiS3纳米晶体的制备方法开展了研究工作，旨在通过简单的溶剂热方法合成Cu3BiS3纳米晶体并探究其合成的最佳条件以及实验条件对纳米结构的形貌和光电性质的影响。然后，利用实验制备的Cu3BiS3粉体作为原料，分散在松油醇、异丙醇中，制作出符合实验条件的浆料，探索制作薄膜太阳电池吸收层，并对其光电性能进行了表征。

研究结果表明，反应温度为180℃时，形成了单一的Cu3BiS3纳米相，粒径为80~500 nm。随着粒径的增大，纳米晶更易于旋涂成膜。通过X射线衍射(XRD)分析，其各衍射峰与标准PDF卡片的匹配得很好(FOM达到3.7)。通过其光吸收测试发现禁带宽度为1.50 eV，且拥有稳定的光电性能，而具有作为太阳能电池吸收层的潜在价值。

毕业论文关键词：薄膜太阳能电池；Cu-Bi-S；纳米材料的制备;光电性质

Preparation and Photoelectric Properties of Cu3BiS3 Nanomaterials

Abstract: In recent years, the rapid developments of nanotechnology promote the improvement in fields of biology, medicine and micro-electronics materials, especially for the development of thin film solar cells−−one of a portfolio of new energy. It develops various types of thin film solar cells such as the solar cell of Ⅲ-Ⅳ group element, CIS/CIGS compounds solar cell and Dye Sensitized Solar Cell. Cu-Bi-S system is similar to CIS/CIGS compounds in term of structure and properties, however, the former has the advantages of the highly reduced cost and the facile preparation technology. In addition, it is greener and paid widespread attention from all works of life. 

In this paper, the preparation methods of Cu3BiS3 nanocrystals had been studied, aiming at synthesizing Cu3BiS3 nanocrystals through a facile solvothermal route and exploring its best requirement of synthesis and the difference of nanostructure and photoelectric properties made by different experimental condition. As-prepared samples were used as materials to obtain the suitable slurry, dissolving in terpilenol and isopropanol, in order to explore a new thin film solar cell and its characterization of photoelectric properties.

The research shows that the single Cu3BiS3 phase was gained at reaction temperature of 180℃. Cu3BiS3 nanocrystals show well-defined uniform particulates with diameters of 80~500 nm. Cu3BiS3 nanocrystals are easily prepared as thin film with increased particle diameter. Its diffraction peaks matched well with JCPDS No. 71-2115 (FOM value reached 3.7). The band gap was 1.50 eV, according to its absorption spectrum test, and Cu3BiS3 nanocrystals have the stable photoelectric properties. Therefore, Cu3BiS3 nanocrystals have the potentials as absorbing layer of thin film solar cell.

Keywords: thin film solar cell; Cu-Bi-S; preparation of nanomaterials; photoelectric properties 

目  录

1. 引  言 1

1.1. 纳米材料概述 1

1.2. 纳米材料的特征 1

1.2.1. 颗粒组元与界面组元 1

1.2.2. 表面与界面效应