TiO_2包覆层结晶度对染料敏化太阳能电池性能的影响  

Performance of Dye-Sensitized Solar Cell with Ag Nanowire Heterojunction Coated by TiO_2 of Different Crystalline Degrees

作　　者：王鸣[1,2] 杜兆富[1,2] 林玉芳[1,2] 赵栋梁[1,2] 

机构地区：[1]钢铁研究总院功能材料研究所,北京100081 [2]北京精密合金技术北京市重点实验室,北京100081

出　　处：《稀有金属》2016年第4期328-333,共6页Chinese Journal of Rare Metals

基　　金：国家自然科学基金项目(51301041)资助

摘　　要：二氧化钛(TiO_2)纳米颗粒广泛应用于染料敏化太阳能电池的光阳极。设计了一种以TiO_2纳米颗粒包覆Ag纳米线阵列的异质结作为光阳极的新型结构的染料敏化太阳能电池。通过控制水热反应温度制备了两种具有不同结晶度的TiO_2纳米颗粒包覆层,利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射分析(XRD)对包覆层的形貌和晶体结构进行了表征,通过I-V曲线和紫外光电子能谱(UPS)分析了TiO_2包覆层的结晶度对电池性能的影响。结果表明:TiO_2包覆层的结晶度对组装后的电池效率具有显著影响,TiO_2结晶度较低的电池具有较高的开路电压(Voc),结晶度较高的电池具有较大的短路电流密度(Jsc)。理论分析表明:电池开路电压的差异来源于TiO_2包覆层结晶度不同导致的电子结构的变化;而短路电流密度的差异则是由光阳极表面积大小和电子从染料激发态向TiO_2导带注入效率不同造成的。The TiO2 nanoparticles are wildly used in dye sensitized solar cell（ DSSC） serving as the photoanode. A new type of DSSC was designed with TiO2 nanoparticles coated Ag nanowire heterojunction as the photoanode. Photoanodes with different TiO2 crystalline degrees were prepared at different hydro-thermal reaction temperatures. The morphology and microstructure were studied by scanning electron microscope（ SEM）,transmission electron microscope（ TEM）,X-ray diffraction（ XRD） and the effect of TiO2 crystalline degree on the performance of the cells was characterized by current-voltage（ I-V） test and ultraviolet photoelectron spectroscopy（ UPS）. The result showed that the performance of cells was clearly influenced by TiO2 crystalline degree. The cell with lower TiO2 crystalline degree displayed higher open circuit voltage（ Voc）. The one with higher TiO2 crystalline degree showed larger short circuit current density（ Jsc）. Different Vocarised from the change in electronic structure of TiO2 coating layer. While different Jscwas caused by the change in surface area of the photoanodes and electron injecting efficiency from excited states of sensitizers to TiO2 conducting bands.

关 键 词：包覆结构 TIO2纳米颗粒 Ag纳米线阵列 结晶度 光伏特性 

分 类 号：TM914.4[电气工程—电力电子与电力传动]