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Indenothiophene-based asymmetric small molecules for organic solar cells

机译：基于茚并噻吩的不对称小分子用于有机太阳能电池

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The development of organic semiconductors is of key importance in order to improve the performance of organic solar cells (OSCs). Three indenothiophene (IT)-containing small molecules (IT3T, ITFBT and IT2FBT) were designed and synthesized for small molecule OSCs. The thermal, optical, and electrochemical properties of the molecules were investigated. The optical bandgaps of the three small molecules are ranged from 1.80 to 2.20?eV depending on different terminal groups flanked on the IT. We study the photovoltaic performances of the three molecules by fabricating OSCs with PC71BM as an electron acceptor. Among the three molecules, ITFBF exhibited the best power conversion efficiency of 4.57% with a high open circuit voltage (VOC) of 0.98 V. We also briefly discuss structure–property guidelines for small molecules used for OSCs. The results demonstrate that IT-based small molecules are promising for small molecule OSCs with large VOCs.
机译：为了改善有机太阳能电池（OSC）的性能，有机半导体的开发至关重要。设计并合成了三种含茚并噻吩（IT）的小分子（IT3T，ITFBT和IT2FBT）用于小分子OSC。研究了分子的热，光学和电化学性质。三个小分子的光学带隙范围为1.80至2.20？eV，具体取决于IT侧翼的不同末端基团。我们以PC 71 BM为电子受体制备OSC，研究了这三种分子的光电性能。在这三个分子中，ITFBF在0.98 V的高开路电压（ V OC ）下表现出4.57％的最佳功率转换效率。我们还简要讨论了用于OSC的小分子的结构性质指南。结果表明，基于IT的小分子有望用于具有大 V OC s的小分子OSC。

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