Asymmetric Side‑Group Engineering of Nonfused Ring Electron Acceptors for High‑Efficiency Thick‑Film Organic Solar Cells (IMAGE)
Caption
- The asymmetric side-group strategy was employed to develop a nonfused ring electron acceptor, designated as TT-Ph-C6, exhibiting enhanced solubility and three-dimensional molecular stacking.
- Strong π–π interactions optimized blend film morphology, enabling TT-Ph-C6-based devices to achieve a power conversion efficiency (PCE) of 18.01% and FF of 80.10%, surpassing the 16.78% PCE of symmetric-chain 2BTh-2F.
- Extended exciton diffusion lengths and accelerated dissociation further endowed TT-Ph-C6 with exceptional thick-film tolerance, delivering 15.18% PCE at 200 nm and 14.64% at 300 nm—among the highest efficiencies reported for non-fused acceptors.
Credit
Dawei Li, Nan Wei, Ya-Nan Chen, Xiaodong Wang, Xu Han, Ziqing Bian, Xinyuan Zhang, Zhe Zhang, Wenkai Zhang, Xinjun Xu, Cuihong Li*, Yahui Liu*, Hao Lu*, Zhishan Bo*.
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CC BY-NC-ND