Although the combination of wide band gap polymer donors and narrow band gap small-molecule acceptors achieved state-of-the-art performance as bulk heterojunction (BHJ) active layers for organic solar cells, there have been only several of the wide band gap polymers that actually realized high-efficiency devices over >10%. Herein, we developed high-efficiency, low-energy-loss fullerene-free organic solar cells using a weakly crystalline wide band gap polymer donor, PBDTTPD-HT, and a nonfullerene small-molecule acceptor, ITIC. The excessive intermolecular stacking of ITIC is efficiently suppressed by the miscibility with PBDTTPD-HT, which led to a well-balanced nanomorphology in the PBDTTPD-HT/ITIC BHJ active films. The favorable optical, electronic, and energetic properties of PBDTTPD-HT with respect to ITIC achieved panchromatic photon-to-current conversion with a remarkably low energy loss (0.59 eV).

中文翻译：

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基于富噻吩[3,4- c ]吡咯-4,6-二酮宽带隙聚合物供体的无富勒烯有机太阳能电池，效率为10.2％，能量损失为0.59 eV

尽管宽带隙聚合物供体和窄带隙小分子受体的结合作为有机太阳能电池的本体异质结（BHJ）活性层获得了最先进的性能，但只有几种宽带隙聚合物实际上实现了超过10％的高效设备。本文中，我们使用弱结晶宽带隙聚合物供体PBDTTPD-HT和非富勒烯小分子受体ITIC开发了高效，低能耗的无富勒烯有机太阳能电池。与PBDTTPD-HT的混溶性有效地抑制了ITIC的分子间过度堆积，从而在PBDTTPD-HT / ITIC BHJ活性薄膜中形成了良好平衡的纳米形态。有利的光学，电子，