溶液pH值对化学浴法制备的Cd_xZn_(1-x)S薄膜光电性能的影响  

Influence of Solution pH Value on Photoelectric Property of Cd_xZn_(1-x)S Film Prepared by Chemical Bath Deposition

作　　者：姚函妤 沈鸿烈[1] 焦静[1] 张三洋 李金泽[1] 王威[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院江苏省能量转换材料与技术重点实验室,南京210016

出　　处：《光子学报》2017年第3期42-48,共7页Acta Photonica Sinica

基　　金：国家自然科学基金(No.61176062);江苏省工业支撑项目(No.BE2012103);江苏省前瞻性联合创新项目(No.BY2016003-09);江苏省研究生培养创新工程(No.KYLX16-0342);江苏高校优势学科建设工程项目资助~~

摘　　要：采用氯化镉、氯化锌、硫脲、柠檬酸钠和氨水的溶液体系通过化学浴沉积法合成Cd_xZn_(1-x)S薄膜,利用X射线衍射分析、扫描电子显微镜、能谱仪和紫外可见近红外分光光度计等表征手段研究了Cd_xZn_(1-x)S薄膜的形貌、相结构和光学性能,测试了薄膜的光电流响应曲线并对薄膜的光电性能进行了分析.结果表明:在pH值为10至13范围内成功制备了均匀的Cd_xZn_(1-x)S薄膜;随着pH值升高,薄膜中Zn原子比例与光学带隙减小;制备的薄膜均表现出明显的光电导现象.pH值为11和12时薄膜的表面最为平整致密,结晶性最好,光学带隙分别为2.92eV和2.72eV,光暗电导比均为1.20,光源关闭后电流下降过程最快,10s后电流分别下降了约68.55%和69.39%.Cd_xZn_（1-x）S thin films were prepared by chemical bath deposition in a solution containing cadmium chloride,zinc chloride,thiourea,sodium citrate and ammonia.The morphological,structural and optical properties of Cd_xZn_（1-x）S films were investigated by X-ray diffraction,scanning electron microscopy,energy disperse spectroscopy and UV-vis-NIR spectroscopy.The photo-current response curves were also tested to study their electrical property.It was found that Cd_xZn_（1-x）S thin films were successfully prepared at pH values from 10 to 13.With increasing of pH value,the ratio of zinc atom in the film and optical band gap decreased.All the films showed obvious photoconductive phenomenon.The Cd_xZn_（1-x）S films prepared at pH =11and 12 showed uniform and dense surface morphology and presented good crystallinity.Their optical band gaps were about 2.92 eV and 2.72 eV respectively,with light and dark conductivity ratio of 1.20 both.The photo-currents in the samples fell more quickly when the light was turned off,with current reduction of about 68.55% and 69.39% after10 s.

关 键 词：太阳能电池缓冲层 CdxZn1-xS薄膜 化学浴沉积法 光电流响应 光电导现象 光敏性 

分 类 号：O734[理学—晶体学]