Ag-Ag_2Se共敏化ZnO花-棒异质结构的合成及其光电化学特性  

Synthesis and Photovoltaic Charateristics of Ag-Ag2Se Sensitized ZnO Flower-Rod Heterostructures

作　　者：韩志钟[1,2] 韦力瑗[1,2] 郭晔[1,2] 潘海波[1,2] 陈建中[1] 陈耐生[1,2] 

机构地区：[1]福州大学化学化工学院,福州350108 [2]福州大学功能材料研究所,福州350002

出　　处：《无机化学学报》2013年第9期1856-1862,共7页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.91022025;51072036;21201035);福建省自然基金(No.2012J01204)资助项目

摘　　要：采用水相法合成ZnO花-棒(ZFRs)有序阵列结构,同时利用离子交换法,制备Ag和Ag2Se量子点共敏化光ZnO光阳极(AA-ZFRs)。通过扫描电子显微镜(SEM)、X射线粉末衍射(XRD)、X射线能量色散谱(EDS)和透射电子显微镜(TEM)等手段对样品进行了分析和表征,并测试其光电化学特性以及量子效应。结果表明,Ag-Ag2Se共敏化ZnO花-棒三维有序结构对太阳光的吸收范围延展至近红外区(750 nm),并且在敏化层与ZnO基质界面形成异质结,有效的抑制光生电子-空穴对复合,增强光转换量子效应,从而提高光电化学性能,开路电压达到-0.77 V,短路电流为0.64 mA。ZnO flower-rod ordered arrays （ZFRs） were synthesized via a liquid phase method, and the ZFRs were sensitized with Ag and Ag2Se quantum dots （AA-ZFRs） by ion exchange. Scanning electron microscopy （SEM）, powder X-ray diffraction （XRD）, energy dispersive X-ray spectra （EDS）, and transmission electron microscopy （TEM） were used to characterize Ag and Ag2Se sensitized ZnO flower-rods （AA-ZFRs）. And the photoeleetrochemical properties and quantum efficiency were also investigated. The results indicate that the optical absorption of AA- ZFRs can be eontrollably tuned to cover almost the entire visible spectrum. The sensitization with Ag-Ag2Se restrains the recombination of photogenerated electron-hole pairs due to the heterojunetion between Ag-Ag2Se and ZFRs, and enhances the incident photon-to-electron conversion efficiency. Thus, the as-prepared AA-ZFRs exhibit a higher open-circuit photovoltage （-0.77 V Ag/AgC1） and short-circuit photocurrent （0.64 mA-era-2） under visible light.

关 键 词：ZnO花-棒 Ag-Ag2Se共敏化 量子点 光电化学特性 

分 类 号：O649[理学—物理化学]