摘要
Herein, we for the first time doped Nb^5+into the low-temperature(<100°C) SnO2sol-gel route to tailor the electrical property of SnO2 layers and the band alignment between SnO2 and the normally used mixed perovskites. The results revealed that proper Nb5+doping increased the conductivity of the SnO2 electron transport layer(ETL), and the conduction band(CB) level of the SnO2 ETL was shifted down to approach the CB level of perovskites, which facilitated the electron injection from perovskite to SnO2, accelerated the charge transport, and reduced the non-radiative recombination, leading to improved power conversion efficiency from18.06% to 19.38%. The Nb^5+doping process provided an efficient route for fabricating high-efficiency perovskite solar cells(PSCs) at a temperature lower than 100°C, and promoted the commercialization progress of PSCs.
本文中我们首次在低温(<100°C)SnO_2溶胶-凝胶中通过掺杂Nb^(5+)调控SnO_2电学性质,使SnO_2与混合离子钙钛矿之间形成更匹配的能级.掺杂Nb^(5+)后SnO_2电子传输层导电率明显提升,导带位置下移更加接近混合离子钙钛矿导带,有效促进了电子由SnO_2向钙钛矿层的注入,并加速了电子传输过程,二者的共同作用使非辐射复合几率降低,器件效率由18.06%提升至19.38%. Nb^(5+)掺杂SnO_2为低温(<100°C)制备高效率钙钛矿太阳能电池提供了有效参考途径,有望进一步推动钙钛矿太阳能电池的产业化进程.
作者
Jing Liu
Nan Li
Qingshun Dong
Jiangwei Li
Chao Qin
Liduo Wang
刘京;李楠;董庆顺;李江伟;秦超;王立铎(Key Lab of Organic Optoelectronics & Molecular Engineering of Ministry of Education, Department of Chemistry,Tsinghua University;Key Laboratory of Polyoxometalate Science of Ministry of Education, Department of Chemistry, Northeast Normal University)
基金
supported by the National Natural Science Foundation of China (51273104 and 91433205)
