Journal
ACS NANO
Volume 14, Issue 2, Pages 1445-1456Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b03268
Keywords
inverted perovskite solar cells; self-assembled inonolayers; stability; interfaces; recombination
Categories
Funding
- Helmholtz Energy Alliance Hybrid Photovoltaics
- Potsdam Graduate School (PoGS)
- HyPer-Cells
- HI-SCORE research school
- Deutsche Forschungsgemeinschaft (DFG) [182087777-SFB 951, 423749265-SPP 2196]
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Perovskite solar cells are among the most exciting photovoltaic systems as they combine low recombination losses, ease of fabrication, and high spectral tunability. The Achilles heel of this technology is the device stability due to the ionic nature of the perovskite crystal, rendering it highly hygroscopic, and the extensive diffusion of ions especially at increased temperatures. Herein, we demonstrate the application of a simple solution-processed perfluorinated self-assembled monolayer (p-SAM) that not only enhances the solar cell efficiency, but also improves the stability of the perovskite absorber and, in turn, the solar cell under increased temperature or humid conditions. The p-i-n-type perovskite devices employing these SAMs exhibited power conversion efficiencies surpassing 21%. Notably, the best performing devices are stable under standardized maximum power point operation at 85 degrees C in inert atmosphere (ISOS-L-2) for more than 250 h and exhibit superior humidity resilience, maintaining similar to 95% device performance even if stored in humid air in ambient conditions over months (similar to 3000 h, ISOS-D-1). Our work, therefore, demonstrates a strategy towards efficient and stable perovskite solar cells with easily deposited functional interlayers.
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