高效、廉价、环保、便携的太阳电池将是未来发展的重要方向。本项目拟以柔性无Cd环保型Cu2ZnSnS4（CZTS）薄膜太阳电池为研究目标，提出以柔性钼箔为衬底和以Zn(O,S)为缓冲层，研究CZTS/Zn(O,S)异质结及其太阳电池的制备工艺和光电性能。拟利用溶胶凝胶法和化学浴法与热处理工艺相结合在柔性Mo衬底上先后制备CZTS和O/S比例可调的Zn(O,S)薄膜，构建CZTS/Zn(O,S)异质结，探究薄膜的制备工艺对该异质结的组成、微结构和光电性能的影响规律，阐明该异质结的界面特性、能带结构、载流子输运和有效收集等相关问题。将理论模拟与实验研究相结合，揭示CZTS太阳电池的制备工艺、表面、界面、膜层结构和物理参数与其性能的内在联系，以期获得效率高于5%的无Cd柔性CZTS太阳电池，研究结果对发展新型的绿色环保太阳电池将有重要的科学意义。

Solar cells with high efficiency, low-cost, friendly-environment and portability will be an important research direction in the future. In this proposal, our object is to develop flexible and environment-friendly Cu2ZnSnS4 (CZTS) thin film solar cells without toxic Cd. Based on flexible Mo foil substrates and Cd-free Zn(O,S) buffer layers, the preparation and photovoltaic properties of CZTS/Zn(O,S) heterojunctions and solar cells will be investigated. CZTS and Zn(O,S) films with variable O/S ratio will be deposited successively on the Mo foil substrates by sol-gel method and chemical bath deposition and then sulphurization (or annealing) to obtain CZTS/Zn(O,S) heterojunctions. The influences of preparation process on the constitutes, micro-structures and photoelectrical properties of the CZTS/Zn(O,S) heterojunctions will be explored. The interfacial characteristics, energy band diagram, transportation mechanism and effective collection of the carriers in the CZTS/Zn(O,S) heterojunction will be clarified. By combining the theoretical simulation with the experimental exploration, the internal relations among the fabrication process, device structures, surfaces, interfaces, physical parameters, and the photovoltaic performances of CZTS solar cells will be revealed in order to obtain flexible and Cd-free CZTS solar cells with an efficiency larger than 5% . The research result will be of important scientific significance for developing new types of green and environment-friendly solar cells.