Size Effect of Two-Dimensional Conjugated Space in Photovoltaic Polymers' Side Chain: Balancing Phase Separation and Charge Transport
Size Effect of Two-Dimensional Conjugated Space in Photovoltaic Polymers' Side Chain: Balancing Phase Separation and Charge Transport
复制标题
光伏聚合物侧链二维共轭空间的尺寸效应：平衡相分离和电荷传输
DOI：
10.1021/acsami.9b23499
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发表时间：
2020-04-08
影响因子：
9.5
通讯作者：
Yang, Renqiang
中科院分区：
文献类型：
--
作者：
Li, Xiaoming;Huang, Gongyue;Yang, Renqiang
Various two-dimensional (2D) side-chain-substituted benzo-(1,2-b:4,5-b')dithiophene (BDT) blocks have been used to construct donor polymers, whereas the size effect of the side chains on the photovoltaic performance was overlooked in the past few years. In this work, three size-varied conjugated spaces (benzene, naphthalene, and biphenyl) were introduced into the corresponding polymers PBDB-Ph, PBDB-Na, and PBDB-BPh. This space engineering has a significant impact on the extent of phase separation in the active layer which blended with the polymer and the acceptor ITCPTC and preserved the desired morphology. The varied space size in the side chains lead to distinct balance mobility ratios of holes to electrons (benzene, 0.21; naphthalene, 0.75; and biphenyl, 0.57). Finally, PBDB-Na-based polymer solar cells (PSCs) delivered the highest power conversion efficiency of 12.52% when compared to the PSC performances of PBDB-Ph (8.48%) and PBDB-BPh (11.35%). The method in tailoring the side chain structures could fabricate a balance between phase separation and charge transport, providing an enlightenment for the development of photovoltaic devices.
