Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 11, Issue 16, Pages 6772-6778Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.0c01776
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Funding
- Russian Science Foundation [18-13-00353]
- Russian Ministry of Science and Education [0089-2019-0010/AAAA-A19-119071190044-3]
- Russian Foundation for Basic Research [20-42-660003]
- Ministry of Education and Science of Russia [AAAA-A18-118020190098-5, FEUZ-2020-0060]
- Russian Science Foundation [18-13-00353] Funding Source: Russian Science Foundation
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Hybrid perovskite solar cells attract a great deal of attention due to the feasibility of their low-cost production and their demonstration of impressive power conversion efficiencies (PCEs) exceeding 25%. However, the insufficient intrinsic stability of lead halides under light soaking and thermal stress impedes practical implementation of this technology. Herein, we show that the photothermal aging of a widely used perovskite light absorber such as MAPbI(3) can be suppressed significantly by using polyvinylcarbazole (PVC) as a stabilizing agent. By applying a few complementary methods, we reveal that the PVC additive leads to passivation of defects in the absorber material. Introducing an optimal content of PVC into MAPbI(3) delivers a PCE of 18.7% in combination with a significantly improved solar cell operational lifetime: devices retained similar to 70% of the initial efficiency after light soaking for 1500 h, whereas the control samples without PVC degraded almost completely under the same conditions.
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