标题：Bendable Solar Cells from Stable, Flexible, and Transparent Conducting Electrodes Fabricated Using a Nitrogen-Doped Ultrathin Copper Film
作者：Zhao, Guoqing; Kim, Soo Min; Lee, Sang-Geul; Bae, Tae-Sung; Mun, ChaeWon; Lee, Sunghun; Yu, Huashun; Lee, Gun-Hwan; Lee, Hae-Seok; S 更多 作者机构：[Zhao, Guoqing; Yu, Huashun] Shandong Univ, Sch Mat Sci & Engn, Key Lab Liquid Solid Struct Evolut & Proc Mat, Jinan 250061, Peoples R China.; [Zhao 更多
通讯作者地址：[Song, M; Yun, J]Korea Inst Mat Sci, Surface Technol Div, Chang Won 641831, Gyeongnam, South Korea;[Lee, HS]Korea Univ, Dept Mat Sci & Engn, Seoul 136 更多
来源：ADVANCED FUNCTIONAL MATERIALS
摘要：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.