Wang Yifan, Cong Hailin, Yu Bing, Zhang Zhiguo, Zhan Xiaowei
Institute of Biomedical Materials and Engineering, College of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, China.
Laboratory for New Fiber Materials and Modern Textile, Growing Base for State Key Laboratory, College of Materials Science and Engineering, Qingdao University, Qingdao 266071, China.
Materials (Basel). 2017 Sep 11;10(9):1064. doi: 10.3390/ma10091064.
Indium tin oxide (ITO) is a transparent conductive material which is extensively used in organic solar cells (OSCs) as electrodes. In inverted OSCs, ITO is usually employed as a cathode, which should be modified by cathode buffer layers (CBLs) to achieve better contact with the active layers. In this paper, an amine group functionalized fullerene derivative (DMAPA-C) is used as a CBL to modify the transparent cathode ITO in inverted OSCs based on PTB7 as a donor and PCBM as an acceptor. Compared with traditional ZnO CBL, DMAPA-C exhibited comparable transmittance. OSCs based on DMAPA-C show much better device performance compared with their ZnO counterparts (power conversion efficiencies (PCEs) improved from 6.24 to 7.43%). This is mainly because a better contact between the DMAPA-C modified ITO and the active layer is formed, which leads to better electron transport and collection. Nanoscale morphologies also demonstrate that the surface of DMAPA-C-modified ITO is plainer than the ZnO counterparts, which also leads to the better device performance.
氧化铟锡（ITO）是一种透明导电材料，在有机太阳能电池（OSC）中被广泛用作电极。在倒置的有机太阳能电池中，ITO通常用作阴极，需要通过阴极缓冲层（CBL）进行改性，以实现与活性层更好的接触。在本文中，一种胺基官能化的富勒烯衍生物（DMAPA-C）被用作CBL，以改性基于PTB7作为给体和PCBM作为受体的倒置有机太阳能电池中的透明阴极ITO。与传统的ZnO CBL相比，DMAPA-C表现出相当的透光率。基于DMAPA-C的有机太阳能电池与基于ZnO的电池相比，器件性能要好得多（功率转换效率（PCE）从6.24%提高到7.43%）。这主要是因为在DMAPA-C改性的ITO与活性层之间形成了更好的接触，从而实现了更好的电子传输和收集。纳米级形态也表明，DMAPA-C改性的ITO表面比ZnO的更平整，这也导致了更好的器件性能。
