无水电化学法制备铜锌锡硫薄膜的研究

项目名称： 无水电化学法制备铜锌锡硫薄膜的研究

项目编号： No.51202227

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 无机非金属材料学科

项目作者： 廖成

作者单位： 中物院成都科学技术发展中心

项目金额： 25万元

中文摘要： 当今影响太阳电池普及应用的主要瓶颈在于成本，而采用电化学法沉积制备铜锌锡硫电池是一个非常有希望的低成本光伏解决方案。然而在常规的水相电沉积工艺中，受制于阴极析氢现象以及其它一些非真空成膜普遍面临的镀层质量问题，在此基础上制备的CZTS电池性能并不理想。针对这个问题，申请人拟采用一种"无水电化学共沉积"的方法，用离子液体代替去离子水作为电解质，利用其较宽的电化学窗口，选择合适的共沉积电位，将金属Cu、Zn、Sn一步沉积到阴极。在这个过程中，通过对电流脉冲的控制和参数优化，实现对镀层形貌的调控，结合超声波等物理辅助条件的引入，获取致密、平整且附着良好的Cu-Zn-Sn预制层。随后，预制层再经过高温硫气氛中的退火，得到物相纯净的高质量CZTS多晶薄膜，为制备高效率CZTS电池打下基础。该项目的开展，将为低成本薄膜光伏技术提供新的思路和方法。

中文关键词： 铜锌锡硫；离子液体；电化学沉积；相变；

英文摘要： Nowadays, the high cost problem becomes a bottleneck of the photovoltaic applications. CZTS thin film solar cell, which is fabricated by inexpensive electrochemical deposition(ED) is regarded as one of the most promising solutions. However, CZTS solar cell prepared by conventional ED with aqueous solution has obtained limited effeciency, which is probably due to the hydrogen evolution at the working eletrode and low quality of layers as many other non-vaccum methods. To solve this problem, a new approach called "electrochemical co-deposition with non-aqueous solvent" is utilized in this project.Copper, zinc and tin is co-deposited onto the substrate with ionic liquid electrolyte,that provides a wide window of electrochemical potential. In the ED process, the pulse parameters will be controlled and optimized to well modify the layer morphology. Together with the assistance of ultrasonic condition, a dense and smooth Cu-Zn-Sn precursor with good adhesion will be obtained.It is followed by annealed in sulfur contained atmosphere to achieve a high quality single phase polycrystalline CZTS film as the absorber of PV device. This project provides a new idea and approach to the low cost thin film photovoltaics.

英文关键词： Cu2ZnSnS4；ionic liquids；electrochemical deposition；phase formation；