三元体系化学水浴法制备ZnS薄膜结晶性能的研究

太阳薄膜电池ZnS缓冲层一般以氨水为主络合剂、水合肼为辅助络合剂二元络合体系化学水浴法制备。实验发现以氨水为主络合剂、水合肼和柠檬酸为辅助络合荆三元体系制备的ZnS薄膜质量明显要比氨水、水合肼二元体系的ZnS薄膜好。薄膜表面更加光亮、平整，光透过率能得到明显提高。从实验现象和测试结果来看，随柠檬酸浓度增加，在反应溶液中无定形态白色沉淀明显减少，ZnS薄膜结晶性能也得到明显提高，ZnS薄膜光透过率升高。柠檬酸浓度为0．15mol／L时，薄膜光透过率达到85％左右，完全满足太阳能电池的要求；继续增加柠檬酸的量，薄膜光透过率趋于一致，光透过率略有回落。

Crystallization properties of ZnS films by chemical bath deposition in the ternary system of ammonia, hydrazine hydrate and citric acid

ZnS thin films as buffer layers in thin films solar cell are usually deposited by chemical bath deposition in the binary system of ammonia and hydrazine hydrate. The results indicate that quality of ZnS films prepared in the ternary system of ammonia, hydrazine hydrate and citric acid are better than in the binary system of ammonia and hydrazine hydrate. With the increasing the concentration of citric acid in the solution, it is found the amount of amorphous precipitation in the reactive solution remarkably reduce, accordingly the surface roughness of ZnS films reduces and the transmission index of ZnS films can rise up. when the concentration of citric acid in the solution is 0.15 mol/L, transmission index of ZnS films rise up to 85 % in the range of visible spectrum, it is suitable to fabricate solar cell, if continue to increasing the concentration of citric acid in the solution, transmission index of ZnS films tend to fall after a rise.