Gd^(3+)掺杂TiO_(2)电子传输层的制备及其电池性能

Preparation and properties of Gd^(3+) doped TiO_(2) electron transport layer

电子传输层在钙钛矿太阳能电池中起着十分重要的作用,影响着最终电池的光伏性能.TiO_(2)是钙钛矿太阳能电池电子传输层中应用最广泛的材料之一,其储量丰富、化学稳定性较好.但是在空穴和电子的分离程度以及导电性方面还有待提高.采用溶胶-凝胶法对TiO_(2)进行稀土离子Gd^(3+)掺杂,以此作为钙钛矿太阳能电池的电子传输层.通过XRD、SEM等对材料进行表征.结果表明:微量Gd^(3+)掺杂不会影响TiO_(2)的晶体结构和微观形貌.通过UV-Vis、线性扫描伏安等测试对其光电性能进行表征分析.结果显示:掺杂之后TiO_(2)的紫外吸收强度增加、改变了TiO_(2)的带隙结构,促进光生电子-空穴的分离,提高了电池的短路电流密度,从而提升了器件的转化效率.此工作证明了Gd^(3+)掺杂可以有效地改善钙钛矿太阳能电池的性能.

The electron transport layer plays a very important role in perovskite solar cells,which affects the photovoltaic performance of the final cell.TiO_(2) is one of the most widely used materials in the electron transport layer of perovskite solar cells,with abundant reserves and good chemical stability.However,the degree of separation between holes and electrons and the electrical conductivity need to be improved.The rare earth ion Gd^(3+)doped TiO_(2) was used as the electron transport layer of perovskite solar cells by sol-gel method.The materials were characterized by XRD,SEM,et al.The results show that the doping of Gd^(3+)does not affect the crystal structure and microstructure of TiO_(2).Its photoelectric properties were characterized by UV-Vis and linear sweep voltammetry tests.The results showed that the UV absorption intensity of TiO_(2) increased after doping,the band gap structure of TiO_(2) was changed,the separation of photogenerated electrons and holes was promoted,the short-circuit current density of the battery was improved and the conversion efficiency of the device was improved.This work proves that the doping of Gd^(3+)can effectively improve the performance of perovskite solar cells.