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Stable ultrathin partially oxidized copper film electrode for highly efficient flexible solar cells

Author:
Guoqing Zhao  Wei Wang  Tae-Sung Bae  Sang-Geul Lee  ChaeWon Mun  Sunghun Lee  Huashun Yu  Gun-Hwan Lee  Myungkwan Song  Jungheum Yun  


Journal:
Nature Communications


Abstract(summary):

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.


Page:
2469-2473


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