Department of Chemistry, Energy Institute and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Hong Kong University of Science and Technology , Clear Water Bay Kowloon, Hong Kong.
State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University , Xi'an 710049, P. R. China.
J Am Chem Soc. 2017 May 10;139(18):6298-6301. doi: 10.1021/jacs.7b01606. Epub 2017 Apr 27.
To achieve efficient non-fullerene organic solar cells, it is important to reduce the voltage loss from the optical bandgap to the open-circuit voltage of the cell. Here we report a highly efficient non-fullerene organic solar cell with a high open-circuit voltage of 1.08 V and a small voltage loss of 0.55 V. The high performance was enabled by a novel wide-bandgap (2.05 eV) donor polymer paired with a narrow-bandgap (1.63 eV) small-molecular acceptor (SMA). Our morphology characterizations show that both the polymer and the SMA can maintain high crystallinity in the blend film, resulting in crystalline and small domains. As a result, our non-fullerene organic solar cells realize an efficiency of 11.6%, which is the best performance for a non-fullerene organic solar cell with such a small voltage loss.
为了实现高效的非富勒烯有机太阳能电池，降低从光学带隙到电池开路电压的电压损耗非常重要。在这里，我们报告了一种具有高效率和高开路电压的非富勒烯有机太阳能电池，其开路电压为 1.08V，电压损耗小至 0.55V。通过使用新型宽带隙（2.05eV）给体聚合物与窄带隙（1.63eV）小分子受体（SMA）配对，实现了这种高性能。我们的形态学特性表明，聚合物和 SMA 都可以在共混膜中保持高结晶度，从而形成结晶和小的畴。因此，我们的非富勒烯有机太阳能电池实现了 11.6%的效率，这是非富勒烯有机太阳能电池在如此小的电压损耗下的最佳性能。
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