Zheng Xiangjun, Zuo Lijian, Zhao Feng, Li Yaokai, Chen Tianyi, Shan Shiqi, Yan Kangrong, Pan Youwen, Xu Bowei, Li Chang-Zhi, Shi Minmin, Hou Jianhui, Chen Hongzheng
State Key Laboratory of Silicon Materials, MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027, P. R. China.
Zhejiang University-Hangzhou Global Scientific and Technological Innovation Center, Hangzhou, 310014, P. R. China.
Adv Mater. 2022 Apr;34(17):e2200044. doi: 10.1002/adma.202200044. Epub 2022 Mar 25.
Developing indium-tin-oxide (ITO)-free flexible organic photovoltaics (OPVs) with upscaling capacity is of great significance for practical applications of OPVs. Unfortunately, the efficiencies of the corresponding devices lag far behind those of ITO-based rigid small-area counterparts. To address this issue, an advanced device configuration is designed and fabricated featuring a top-illuminated structure with ultrathin Ag as the transparent electrode. First, a conjugated polyelectrolyte layer, i.e., PCP-Li, is inserted to effectively connect the bottom Ag anode and the hole transport layer, achieving good photon to electron conversion. Second, charge collecting grids are deposited to suppress the increased resistance loss with the upscaling of the device area, realizing almost full retention of device efficiency from 0.06 to 1 cm . Third, the designed device delivers the best efficiency of 15.56% with the area of 1 cm on polyimide substrate, representing as the record among the ITO-free, large-area, flexible OPVs. Interestingly, the device exhibits no degradation after 100 000 bending cycles with a radius of 4 mm, which is the best result for flexible OPVs. This work provides insight into device structure design and optimization for OPVs with high efficiency, low cost, superior flexibility, and upscaling capacity, indicating the potential for the future commercialization of OPVs.
开发具有放大能力的无铟锡氧化物（ITO）柔性有机光伏电池（OPV）对于OPV的实际应用具有重要意义。不幸的是，相应器件的效率远远落后于基于ITO的刚性小面积同类器件。为了解决这个问题，设计并制造了一种先进的器件结构，其具有以超薄银作为透明电极的顶部照明结构。首先，插入一个共轭聚电解质层，即PCP-Li，以有效地连接底部银阳极和空穴传输层，实现良好的光子到电子的转换。其次，沉积电荷收集网格以抑制随着器件面积放大而增加的电阻损耗，实现从0.06到1平方厘米器件效率几乎完全保持。第三，所设计的器件在聚酰亚胺基板上1平方厘米面积时实现了15.56%的最佳效率，这在无ITO、大面积、柔性OPV中创下记录。有趣的是，该器件在半径为4毫米的100000次弯曲循环后没有退化，这是柔性OPV的最佳结果。这项工作为高效、低成本、卓越柔韧性和放大能力的OPV的器件结构设计和优化提供了见解，表明了OPV未来商业化的潜力。
