Achieving Over 15% Efficiency in Organic Photovoltaic Cells via Copolymer Design

作者：Yong Cui, Huifeng Yao, Ling Hong, Tao Zhang, Ye Xu, Kaihu Xian, Bowei Gao, Jinzhao Qin, Jianqi Zhang, Zhixiang Wei, Jianhui Hou · 发表于：Advanced Materials · 年份：2019 · DOI：10.1002/adma.201808356 · 被引用次数：451 · 研究领域：Organic Electronics and Photovoltaics、Conducting polymers and applications、Perovskite Materials and Applications

Ternary blending and copolymerization strategies have proven advantageous in boosting the photovoltaic performance of organic solar cells. Here, 15% efficiency solar cells using copolymerization donors are demonstrated, where the electron-withdrawing unit, ester-substituted thiophene, is incorporated into a PBDB-TF polymer to downshift the molecular energy and broaden the absorption. Copolymer-based solar cells suitable for large-area devices can be fabricated by a blade-coating method from a nonhalogen and nonaromatic solvent mixture. Although ternary solar cells can achieve comparable efficiencies, they are not suitable for environment-friendly processing conditions and show relatively low photostability compared to copolymer-based devices. These results not only demonstrate high-efficiency organic photovoltaic cells via copolymerization strategies but also provide important insights into their applications in practical production.