ZnO/BiVO_4-V_2O_5异质结构光生电荷性质及可见光下表面光电流行为  

Properties of Photogenerated Charge Carriers and Visible-Light Surface Photocurrent of Heterogeneous ZnO/BiVO_4-V_2O_5Structures

作　　者：张宇[1] 林申[1] 张钰[1] 宋溪明[1] 

机构地区：[1]辽宁大学化学院,绿色合成与先进材料制备化学辽宁省重点实验室,沈阳110036

出　　处：《物理化学学报》2013年第11期2399-2404,共6页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(21203082;51273087;21071070);辽宁省教育厅自然科学基金(LT2011001);辽宁省科技厅自然科学基金(201102084);辽宁大学青年基金(2011LDQN02)资助项目~~

摘　　要：利用水热法合成了花状和球状ZnO微纳材料,并与硝酸铋和偏钒酸铵溶液体系反应构筑了ZnO/BiVO4-V2O5复合体系.利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)及X射线衍射(XRD)对材料进行了系统的表征.利用表面光伏(SPV)、表面光电流(SPC)和瞬态光伏(TPV)技术研究了ZnO/BiVO4-V2O5表面光生电荷的产生和传输机制.结果显示该复合材料在可见区产生了良好的光电响应,获得了较高的光生载流子的分离效率,光生电荷的寿命也同时增加.在单色弱可见光(波长500 nm)照射下,复合材料产生良好重复性的表面光电流响应.Spherical and flower-like ZnO micro/nanomaterials are synthesized through a hydrothermal method. ZnO/BiVO4-V2Os composite structures are then prepared in a solution containing Bi（NO3）3 and NH,VO3. The samples were characterized by scanning electron microscopy （SEM）, transmission electron microscopic （TEM）, and X-ray diffraction （XRD）. Surface photovoltage （SPV）, surface photocurrent （SPC）, and transient photovoltage （TPV） techniques were used to investigate the generation and transport mechanisms of the photogenerated charge carriers in the heterogeneous ZnO/BiVO,-V20, structure. The composite materials show good photoelectric response to visible light. Highly efficient separation of photogenerated charge carriers is observed, and the so-formed charge carriers are long lived. Measurements of surface photocurrent by comb-like electrode were performed on the ZnO/BiVO,-V2Os system. Under irradiation by weak monochromatic light （wavelength： 500 nm）, the ZnO/BiVO,-V20, composite materials generate surface photocurrent responses with good reproducibility.

关 键 词：异质结构 表面光电流 表面光伏 瞬态光伏 光生电荷 

分 类 号：O649[理学—物理化学]