Journal
NANO LETTERS
Volume 17, Issue 10, Pages 6385-6390Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b03225
Keywords
Perovskite solar cells; p-i-n; stability; graphene; functionalized graphene; hydrophobic
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Funding
- National Research Foundation of Korea Grant (NRF) [2016RICIB2016188, 2017R1A2B3010049]
- Creative Research Initiative (CRI) program [2014R1A2069102]
- Development Program of the Korea Institute of Energy Research (KIER) [B7-2421]
- Ulsan National Institute of Science and Technology (UNIST) [1.170003.01, 1.170015.01]
- National Research Foundation of Korea [2017R1A2B3010049] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Edged-selectively fluorine (F) functionalized graphene nanoplatelets (EFGnPs-F) with a p-i-n structure of perovskite solar cells achieved 82% stability relative to initial performance over 30 days of air exposure without encapsulation. The enhanced stability stems from F substitution on EFGnPs; fluorocarbons such as polytetrafluoroethylene are well-known for their superhydrophobic properties and being impervious to chemical degradation. These hydrophobic moieties tightly protect perovskite layers from air degradation. To directly compare the effect of similar hydrophilic graphene layers, edge-selectively hydrogen functionalized graphene nanoplatelet (EFGnPs-H) treated devices were tested under the same conditions. Like the pristine MAPbI(3) perovskite devices, EFGnPs-H treated devices were completely degraded after 10 days. The hydrophobic properties of EFGnPs-F were characterized by contact angle measurement. The test results showed great water repellency compared to pristine perovskite films or EFGnPs-H coated films. This resulted in highly air-stable p-i-n perovskite solar cells.
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