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ZnO不同微结构/Cu4Bi4S9异质结光生电荷分离机制与光电性质
供稿: 赵涛涛 时间: 2018-11-12 次数:

作者:赵涛涛

作者单位:河南大学外语学院

摘要:采用不同方法分别制备出ZnO纳米颗粒、纳米线、纳米棒、纳米管等4种微结构薄膜,以Cu4Bi4S9(CBS)纳米带为电子给体制备出ZnO不同微结构/CBS异质结。稳态光电压谱结果表明各异质结构都具有优于单一组分的光伏响应,而且光伏性质呈现出,ZnO纳米管/CBS>ZnO纳米棒/CBS>ZnO纳米线/CBS>ZnO纳米颗粒/CBS的特点。较弱正外电场诱导下各异质结构仍然保持稳态下的光伏响应特性。随着外电场逐步提高,ZnO纳米颗粒/CBS光伏性质增加显著,+2 V电压诱导下,ZnO纳米颗粒/CBS已接近ZnO纳米管/CBS光伏响应强度,并明显高于另外2类异质结构光伏性质。从电子受体微结构、异质结厚度、内建电场、能级匹配等方面,分析了关键因素的综合作用对光生电荷分离和收集效率的影响。

基金:国家自然科学基金资助项目(U1204211,51372069); 河南省高校科技创新团队支持计划项目(13IRTSTHN017); 河南省自然科学基金资助项目(2011A140002); 河南省自然科学基金资助项目(132300410236);

关键词:表面光电压谱; 光伏响应; ZnO/Cu4Bi4S9; 异质结;

DOI:10.16186/j.cnki.1673-9787.2016.06.022

分类号:O484

Abstract:ZnO films with several microstructures including nanoparticles,nanowires arrays,nanorods arrays and nanotubes arrays were prepared with different methods. With Cu_4Bi_4S_9( CBS) as electron donor,different ZnO microstructures / CBS heterojunctions were fabricated. The steady state surface photovoltage( SPV) indicates that all of heterostructures exhibit the higher photovoltaic response than two components. Moreover,the SPVs present that ZnO nanotubes / CBS is higher than ZnO nanorots / CBS,ZnO nanorots / CBS higher than ZnO nanowires / CBS and ZnO nanowires / CBS higher than ZnO nanoparticles / CBS. Under the low positive bias,the SPVs exhibit the same changing tendency as the steady state. With bias increasing,the surface photovoltage of ZnO nanoparticles / CBS increases quickly. Under + 2 V,the SPV of nanoparticles / CBS is similar with ZnO nanotubes / CBS,and higher than other two types of heterojunctions. From microstructure of electron acceptor,thickness of heterojunction,build-in electric field,energy level matching,the comprehensive effect of main fac-tors on the separation and collection efficiency of photogenerated charges were analysed.

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