钙钛矿敏化TiO_2-SrTiO_3纳米棒太阳能电池的制备及性能研究

Synthesis of TiO_2-SrTiO_3 Nanorod Arrays and Their Photoelectrical Performance in Perovskite Sensitized Solar Cells

采用简单的水热法在FTO(掺杂氟的SnO_2导电玻璃(SnO_2:F))衬底上直接合成了一维取向的单晶金红石型二氧化钛薄膜,然后使用二氧化钛纳米棒作为模板和反应物Sr(OH)_2作为锶源,通过水热反应成功在TiO_2纳米棒阵列的表面沉积了SrTiO3立方纳米颗粒。并以TiO_2-SrTiO_3作为工作电极,钙钛矿型的CH_3NH_3PbI_3和CsSnI_(2.95)-F_(0.05)分别作为光敏剂和电解质组装敏化太阳能电池。通过调整煅烧温度和二次水热反应中Sr(OH)_2溶液的浓度,钙钛矿敏化太阳能电池的光电转换性能有明显改善,最高效率达到0.34%,是未经SrTiO_3修饰样品的2倍。

In this study,the heterostructured TiO2-SrTiO3 nanorod array films were synthesized through a two-step hydrothermal method.Perovskite SrTiO3 cubic nanoparticles were evenly deposited on the surface of single-crystal TiO2 nanorod arrays.Allsolid-state solar cells were fabricated with TiO2-SrTiO3 heterostructured composite as the photoanode,perovskite CH3NH3PbI3 and CsSnI（2.95）F（0.05） as the sensitizer and electrolyte respectively.From photoelectrical measurement,the performance of solar cells was highly improved through changing sintering temperature and the concentration of strontium precusor.The highest photoelectrical conversion efficiency of SrTiO3-TiO2 system reached 0.34%,which was about twice of the undecorated TiO2 system.