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ZnO/CdS纳米柱阵列太阳电池中光电转化效率研究

发表时间:2013-03-31  浏览量:1918  下载量:1060
全部作者: 郭道友,王金斌,李培刚,崔灿,钟向丽,王芳,张克栋,黄欢娣,金吉松
作者单位: 湘潭大学材料与光电物理学院;浙江理工大学光电材料与器件中心
摘 要: 采用简易水热法在FTO(F∶SnO2)衬底上制备ZnO纳米柱阵列,并通过连续离子层吸附反应(successive ionic layer adsorption and reaction, SILAR)法在ZnO上原位沉积CdS量子点制备ZnO/CdS光阳极,研究不同SILAR循环次数对电池光电转化效率(incident photon-to-current conversion efficiency,IPCE)的影响。结果表明:CdS拓宽了对可见光区的吸收,增强了对太阳光的利用率,同时,CdS与ZnO构成Ⅱ型异质结增加了电子注入量子效率(ηinj),IPCE显著增加。10次循环前,随着循环次数的增加,ZnO/CdS异质结界面增多,增加了电子和空穴的有效分离,并且CdS量子点增多,增强了对可见光的光捕获效率,IPCE逐渐上升;10次循环后,随着循环次数的进一步增加,CdS量子点层逐渐变厚,增加了光生载流子被缺陷捕获的几率,ηinj开始大幅减小,导致IPCE逐渐下降。
关 键 词: 太阳能;ZnO/CdS纳米柱阵列光阳极;连续离子层吸附反应法;光电转化效率;电子注入量子效率
Title: Study on incident photon-to-current conversion efficiency of the ZnO/CdS nanorod array solar cells
Author: GUO Daoyou, WANG Jinbin, LI Peigang, CUI Can, ZHONG Xiangli, WANG Fang, ZHANG Kedong, HUANG Huandi, JIN Jisong
Organization: Faculty of Materials, Optoelectronics and Physics, Xiangtan University; Center for Optoelectronics Materials and Devices, Zhejiang Sci-tech University
Abstract: Aligned ZnO nanorod arrays were fabricated by a facile hydrothermal method on FTO(F∶SnO2)substrate, and ZnO/CdS photoanodes were prepared through by in situ depositing CdS quantum dots (QDs) on ZnO through a successive ionic layer adsorption and reaction (SILAR) method. Then, the effect of SILAR cycle number on the incident photon-to-current conversion efficiency (IPCE) was investigated. The results showed that CdS broadened the visible light area for absorption and enhanced the utilization rate of the sun energy. Meanwhile, II-type semiconductor heterojunction at the ZnO/CdS interface increased the charge-injection efficiency(ηinj), and IPCE increased significantly. Before 10 cycles, with increasing cycle number, ZnO/CdS heterojunction interface increased, which raised the effective separation of the electron and hole. In addition, the increase of CdS quantum dots enhanced the light harvesting efficiency, and IPCE increased gradually. After 10 cycles, with the further increase of cycle number, CdS quantum dot layer thickened gradually, which increased the capture probability of photogenerated carrier by defect. ηinj began to fall significantly, and thus led to IPCE decrease gradually.
Key words: solar energy; ZnO/CdS nanorod array photoanodes; successive ionic layer adsorption and reaction method; incident photon-to-current conversion efficiency; charge-injection efficiency
发表期数: 2013年3月第6期
引用格式: 郭道友,王金斌,李培刚,等. ZnO/CdS纳米柱阵列太阳电池中光电转化效率研究[J]. 中国科技论文在线精品论文,2013,6(6):534-542.
 
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