Zhao Guoqing, Wang Wei, Bae Tae-Sung, Lee Sang-Geul, Mun ChaeWon, Lee Sunghun, Yu Huashun, Lee Gun-Hwan, Song Myungkwan, Yun Jungheum
Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, School of Materials Science and Engineering, Shandong University, Jinan 250061, China.
Division of Surface Technology, Korea Institute of Materials Science, Changwon, Gyeongnam 641-831, Republic of Korea.
Nat Commun. 2015 Nov 5;6:8830. doi: 10.1038/ncomms9830.
Advances in flexible optoelectronic devices have led to an increasing need for developing highly efficient, low-cost, flexible transparent conducting electrodes. Copper-based electrodes have been unattainable due to the relatively low optical transmission and poor oxidation resistance of copper. Here, we report the synthesis of a completely continuous, smooth copper ultra-thin film via limited copper oxidation with a trace amount of oxygen. The weakly oxidized copper thin film sandwiched between zinc oxide films exhibits good optoelectrical performance (an average transmittance of 83% over the visible spectral range of 400-800 nm and a sheet resistance of 9 Ω sq(-1)) and strong oxidation resistance. These values surpass those previously reported for copper-based electrodes; further, the record power conversion efficiency of 7.5% makes it clear that the use of an oxidized copper-based transparent electrode on a polymer substrate can provide an effective solution for the fabrication of flexible organic solar cells.
柔性光电器件的进展导致对开发高效、低成本、柔性透明导电电极的需求不断增加。由于铜相对较低的光透射率和较差的抗氧化性，基于铜的电极一直难以实现。在此，我们报告通过用痕量氧气进行有限的铜氧化来合成完全连续、光滑的铜超薄膜。夹在氧化锌薄膜之间的弱氧化铜薄膜表现出良好的光电性能（在400 - 800 nm可见光谱范围内平均透过率为83%，方阻为9 Ω sq(-1)）和强抗氧化性。这些值超过了先前报道的基于铜的电极的值；此外，7.5%的创纪录功率转换效率清楚地表明，在聚合物基板上使用氧化铜基透明电极可为柔性有机太阳能电池的制造提供有效的解决方案。
