CdS薄膜结构表征与光电化学性能研究  

Structural and Photoelectrochemical Characterization of CdS Thin Film Electrodes in Photoelectrochemical Water Splitting System

作　　者：苏进展[1] 李明涛[1] 张西民[1] 郭烈锦[1] 

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安710049

出　　处：《武汉理工大学学报》2006年第E02期568-573,共6页Journal of Wuhan University of Technology

基　　金：国家重点基础研究发展规划项目（2003CB214500）.

摘　　要：以超声喷雾热分解方法成功地制备了低成本高质量的CdS薄膜，用XRD、SEM、拉曼光谱、紫外可见吸收光谱，研究了4个不同沉积温度下制备的CdS薄膜的结构性质，并对其进行光电化学产氢性能测试。实验发现，薄膜结晶程度随着沉积温度的升高而增加，但禁带宽度保持不变。SEM测试显示薄膜均匀致密。表明此方法是一种有效的半导体薄膜电极制备方法。光电化学活性随着沉积温度的升高先增大后减小，在300℃为最佳，在187mW/cm^2的光照下此温度制备的电极的光电流密度饱和值约为4．imA／cm^2，且在电极电势为-0．13V（vsSCE）处的能量转化效率为0．68％。The structural properties of CdS thin films obtained by ultrasonic spray pyrolysis at different substrate temperature were studied by X-ray diffraction （XRD）, scan electron microscope （SEM）, Raman spectrum and Uv-vis absorption spectrum. The experimental results show that the crystallinity level gets higher with increasing substrate temperature while the bandgap remains constant. This deposition method should be an effective method as the deposited film looks uniform and smooth in the SEM image. Furthermore, the photoelectrochemlcal activities of CdS thin films used as electrode to split water to hydrogen and oxygen were investigated. The photoelectrochemical activity increases and then decreases with increasing substrate temperature which forms a peak value at 300℃. Under a light intensity of 187 mW/cm^2, the electrode deposited at 300℃ gives a saturated photocurrent of 4.1 mA/cm^2 with increasing electrode potential. The highest energy conversion efficiency was calculated as 0.68 % at electrode potential of -0.13 V（vs SCE）.

关 键 词：喷雾热分解 光电化学 CDS 太阳能制氢 

分 类 号：O649[理学—物理化学]