Journal
NANO LETTERS
Volume 20, Issue 5, Pages 3718-3727Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c00663
Keywords
Flexibility; graphene; metal-induced degradation; perovskite solar cell; transparent conductive electrode
Categories
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Future Planning [2019R1A2C1009025]
- Korea government (MSIT) [2019R1A4A1029237]
- Technology Development Program to Solve Climate Changes of the National Research Foundation (NRF) - Ministry of Science and ICT [2019M1A2A2072416]
- 2019 Research Fund of KOREA East-West Power Co., LTD (EWP) [2.190433.01]
- National Research Foundation of Korea [2019M1A2A2072416] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Metal-based transparent conductive electrodes (TCEs) are attractive candidates for application in indium tin oxide (ITO)-free solar cells due to their excellent electrical conductivity and cost effectiveness. In perovskite solar cells (PSCs), metal-induced degradation with the perovskite layer leads to various detrimental effects, deteriorating the device performance and stability. Here, we introduce a novel flexible hybrid TCE consisting of a Cu grid-embedded polyimide film and a graphene capping layer, named GCEP, which exhibits excellent mechanical and chemical stability as well as desirable optoelectrical properties. We demonstrated the critical role of graphene as a protection layer to prevent metal-induced degradation and halide diffusion between the electrode and perovskite layer; the performance of the flexible PSCs fabricated with GCEP was comparable to that of their rigid ITO-based counterparts and also exhibited outstanding mechanical and chemical stability. This work provides an effective strategy to design mechanically and chemically robust ITO-free metal-assisted TCE platforms in PSCs.
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