基于Zn_2SnO_4纳米线固态染料敏化太阳能电池光生电荷分离与光电性质研究

Separation of Photogenerated Charges and Photoelectric Properties in Solid State Dye-Sensitized Solar Cells with Zn_2SnO_4 Nanowires

采用水热法在不锈钢滤网上制备出Zn2SnO4纳米线.首次通过制备Zn2SnO4纳米线/CBS异质结构来提高复合体系的光生电荷分离效率;逐步改变CBS厚度系统研究了Zn2SnO4纳米线/CBS染料敏化太阳能电池的光电转换效率.结果表明Cu4Bi4S9为1.0μm时,Zn2SnO4纳米线/Cu4Bi4S9异质结具有最强稳态和电场诱导表面光伏效应,对应染料敏化电池最高光电转换效率为4.12%.从光吸收、薄膜厚度、内建电场和能级匹配等几个方面,讨论了异质结和固态染料敏化电池中光生电荷分离的影响因素以及光生电荷传输机制.

Zn2SnO4 nanowires were synthesized on stainless steel filter with hydrothermal method. Zn2 SnO4 nanowires/ Cut Bi4S9 heterojunction was first prepared to increase the separation efficiency of photogenerated charges in composite system. Here, the overall light-to-electricity efficiencies of several Zn2 SnO4 nanowires/Cu4 Bi4 S9 dye-sensitized solar cells were studied systematically with changing Cu4 Bi4 S9 thickness gradually. With Cu4 Bi4 29 of 1.0μm thickness, there are the highest steady state and electric field induced surface photovoltage, and the corresponding Zn2 SnO4 nanowires/Cth Bi4S9 solar cells exhihits the highest photoelectric conversion efficiency of 4. 12%. From the absorption, thickness of film, build-in electric field and energy level matching, etc. , the separation process and transport mechanism of photogenerated charges in Zn2SnO4nanowires/Zn- Fe2O4 heterojunetions and solid state dye-sensitized solar ceils were analysed in detail.