Annealing-free efficient vacuum-deposited planar perovskite solar cells with evaporated fullerenes as electron-selective layers

作者：Zhao, Dewei^*; Ke, Weijun; Grice, Corey R.; Cimaroli, Alexander J.; Tan, Xinxuan; Yang, Mengjin; Collins, Robert W.; Zhang, Hongmei; Zhu, Kai; Yan, Yanfa^*

来源：Nano Energy, 2016, 19: 88-97.

DOI：10.1016/j.nanoen.2015.11.008

• Perovskite solar cells
• Vacuum-deposition
• Electron-selective layer
• Hole blocking layer
• C-60 and C-70 (fullerenes)

We present efficient metal oxide-free and annealing-free planar perovskite solar cells with the regular cell structure using vacuum-deposited fullerenes C-60 and C-70 as the electron-selective layers and vacuum-processed perovskites as the light absorbers. The devices with an ultrathin C-60 layer (5.5 nm) yielded an average power conversion efficiency of 14.3% and a maximum efficiency of 15.7%. The best-performing cell produced a steady-state efficiency of 14.6%. The high performance is attributed to the efficient blocking of holes and extraction of electrons by C-60 due to a favorable energy level alignment between the C-60 and the fluorine-doped tin oxide electrodes. With the realization of efficient cells, the annealing-free vacuum deposition of perovskite absorbers and C-60 or C-70 electron-selective layers and intermediate layers demonstrates its power for fabricating all-perovskite tandem solar cells.

• 出版日期2016-1
• 单位南京邮电大学