Annealing-Free Efficient Vacuum-Deposited Planar Perovskite Solar Cells with Evaporated Fullerenes as Electron-Selective Layers

Mengjin Yang, Kai Zhu, Dewei Zhao, Weijun Ke, Corey Grice, Alexander Cimaroli, Xinxuan Tan, Robert Collins, Hongmei Zhang, Yanfa Yan

Research output: Contribution to journalArticlepeer-review

124 Scopus Citations

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 languageAmerican English
Pages (from-to)88-97
Number of pages10
JournalNano Energy
Volume19
DOIs
StatePublished - 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

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