Journal
ACS CENTRAL SCIENCE
Volume 4, Issue 2, Pages 216-222Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscentsci.7b00454
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Funding
- Office of Naval Research, Materials Division [N00014-15-1-2244]
- NSF-CHE [1506839]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1506839] Funding Source: National Science Foundation
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While perovskite solar cells have invigorated the photovoltaic research community due to their excellent power conversion efficiencies (PCEs), these devices notably suffer from poor stability. To address this crucial issue, a solution-processable organic chemical inhibition layer (OCIL) was integrated into perovskite solar cells, resulting in improved device stability and a maximum PCE of 16.3%. Photoenhanced self-doping of the fulleropyrrolidine mixture in the interlayers afforded devices that were advantageously insensitive to OCIL thickness, ranging from 4 to 190 nm. X-ray photoelectron spectroscopy (XPS) indicated that the fulleropyrrolidine mixture improved device stability by stabilizing the metal electrode and trapping ionic defects (i.e., I-) that originate from the perovskite active layer. Moreover, degraded devices were rejuvenated by repeatedly peeling away and replacing the OCIL/Ag electrode, and this repeel and replace process resulted in further improvement to device stability with minimal variation of device efficiency.
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