High Performance All-Polymer Solar Cell via Polymer Side-Chain Engineering (pages 3767–3772)
Yan Zhou, Tadanori Kurosawa, Wei Ma, Yikun Guo, Lei Fang, Koen Vandewal, Ying Diao, Chenggong Wang, Qifan Yan, Julia Reinspach, Jianguo Mei, Anthony Lucas Appleton, Ghada I. Koleilat, Yongli Gao, Stefan C. B. Mannsfeld, Alberto Salleo, Harald Ade, Dahui Zhao and Zhenan Bao
Version of Record online: 24 MAR 2014 | DOI: 10.1002/adma.201306242
An average PCE of 4.2% for all-polymer solar cells from 20 devices with an average J SC of 8.8 mA cm−2 are obtained with a donor-acceptor pair despite a low LUMO-LUMO energy offset of less than 0.1 eV. Incorporation of polystyrene side chains into the donor polymer is found to assist in reducing the phase separation domain length scale, and results in more than 20% enhancement of PCE. We observe a direct correlation between the short circuit current (J SC) and the length scale of BHJ phase separation, which is obtained by resonance soft X-ray scattering.