Abstract
We present efficient metal oxide-free and annealing-free planar perovskite solar cells with the regular cell structure using vacuum-deposited fullerenes C60 and C70 as the electron-selective layers and vacuum-processed perovskites as the light absorbers. The devices with an ultrathin C60 layer (5.5nm) 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 C60 due to a favorable energy level alignment between the C60 and the fluorine-doped tin oxide electrodes. With the realization of efficient cells, the annealing-free vacuum deposition of perovskite absorbers and C60 or C70 electron-selective layers and intermediate layers demonstrates its power for fabricating all-perovskite tandem solar cells.
Original language | American English |
---|---|
Pages (from-to) | 88-97 |
Number of pages | 10 |
Journal | Nano Energy |
Volume | 19 |
DOIs | |
State | Published - 1 Jan 2016 |
Bibliographical note
Publisher Copyright:© 2015 Elsevier Ltd.
NREL Publication Number
- NREL/JA-5900-65583
Keywords
- C and C (fullerenes)
- Electron-selective layer
- Hole blocking layer
- Perovskite solar cells
- Vacuum-deposition