Han Yunfei, Chen Xiaolian, Wei Junfeng, Ji Guoqi, Wang Chen, Zhao Wenchao, Lai Junqi, Zha Wusong, Li Zerui, Yan Lingpeng, Gu Huiming, Luo Qun, Chen Qi, Chen Liwei, Hou Jianhui, Su Wenming, Ma Chang-Qi
School of Nano-Tech and Nano-Bionics University of Science and Technology of China Hefei 230027 P. R. China.
Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences (CAS) Collaborative Innovation Center of Suzhou Nano Science and Technology Suzhou 215123 P. R. China.
Adv Sci (Weinh). 2019 Sep 30;6(22):1901490. doi: 10.1002/advs.201901490. eCollection 2019 Nov.
With the rapid progress of organic solar cells (OSCs), improvement in the efficiency of large-area flexible OSCs (>1 cm) is crucial for real applications. However, the development of the large-area flexible OSCs severely lags behind the growth of the small-area OSCs, with the electrical loss due to the large sheet resistance of the electrode being a main reason. Herein, a high conductive and high transparent Ag/Cu composite grid with sheet resistance <1 Ω sq and an average visible light transparency of 84% is produced as the transparent conducting electrode of flexible OSCs. Based on this Ag/Cu composite grid electrode, a high efficiency of 12.26% for 1 cm flexible OSCs is achieved. The performances of large-area flexible OSCs also reach 7.79% (4 cm) and 7.35% (9 cm), respectively, which are much higher than those of the control devices with conventional flexible indium tin oxide electrodes. Surface planarization using highly conductive PEDOT:PSS and modification of the ZnO buffer layer by zirconium acetylacetonate (ZrAcac) are two necessary steps to achieve high performance. The flexible OSCs employing Ag/Cu grid have excellent mechanical bending resistance, maintaining high performance after bending at a radius of 2 mm.
随着有机太阳能电池（OSCs）的迅速发展，提高大面积柔性有机太阳能电池（>1平方厘米）的效率对于实际应用至关重要。然而，大面积柔性有机太阳能电池的发展严重滞后于小面积有机太阳能电池的发展，电极的大面电阻导致的电损耗是一个主要原因。在此，制备了一种具有<1Ω/sq的面电阻和84%的平均可见光透明度的高导电、高透明的Ag/Cu复合网格，作为柔性有机太阳能电池的透明导电电极。基于这种Ag/Cu复合网格电极，1平方厘米的柔性有机太阳能电池实现了12.26%的高效率。大面积柔性有机太阳能电池的性能也分别达到了7.79%（4平方厘米）和7.35%（9平方厘米），远高于具有传统柔性氧化铟锡电极的对照器件。使用高导电的PEDOT:PSS进行表面平面化以及用乙酰丙酮锆（ZrAcac）对ZnO缓冲层进行改性是实现高性能的两个必要步骤。采用Ag/Cu网格的柔性有机太阳能电池具有优异的机械抗弯曲性，在半径为2毫米的弯曲后仍能保持高性能。
