Bendable Solar Cells from Stable, Flexible, and Transparent Conducting Electrodes Fabricated Using a Nitrogen-Doped Ultrathin Copper Film
- Authors
- Zhao, Guoqing; Kim, Soo Min; Lee, Sang-Geul; Bae, Tae-Sung; Mun, ChaeWon; Lee, Sunghun; Yu, Huashun; Lee, Gun-Hwan; Lee, Hae-Seok; Song, Myungkwan; Yun, Jungheum
- Issue Date
- 20-6월-2016
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- copper; flexible transparent conducting electrode; organic solar cell; polymer substrate; thin film
- Citation
- ADVANCED FUNCTIONAL MATERIALS, v.26, no.23, pp.4180 - 4191
- Indexed
- SCIE
SCOPUS
- Journal Title
- ADVANCED FUNCTIONAL MATERIALS
- Volume
- 26
- Number
- 23
- Start Page
- 4180
- End Page
- 4191
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/88322
- DOI
- 10.1002/adfm.201600392
- ISSN
- 1616-301X
- Abstract
- Copper has attracted significant interests as an abundant and low-cost alternative material for flexible transparent conducting electrodes (FTCEs). However, Cu-based FTCEs still present unsolved technical issues, such as their inferior light transmittance and oxidation durability compared to conventional indium tin oxide (ITO) and silver metal electrodes. This study reports a novel technique for fabricating highly efficient FTCEs composed of a copper ultrathin film sandwiched between zinc oxides, with enhanced transparency and antioxidation performances. A completely continuous and smooth copper ultrathin film is fabricated by a simple room-temperature reactive sputtering process involving controlled nitrogen doping (<1%) due to a dramatic improvement in the wettability of copper on zinc oxide surfaces. The electrode based on the nitrogen-doped copper film exhibits an optimized average transmittance of 84% over a spectral range of 380-1000 nm and a sheet resistance lower than 20 Omega sq(-1), with no electrical degradation after exposure to strong oxidation conditions for 760 h. Remarkably, a flexible organic solar cell based on the present Cu-based FTCE achieves a power conversion efficiency of 7.1%, clearly exceeding that (6.6%) of solar cells utilizing the conventional ITO film, and this excellent performance is maintained even in almost completely bent configurations.
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Collections - Graduate School of Energy and Environment (KU-KIST GREEN SCHOOL) > Department of Energy and Environment > 1. Journal Articles
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