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Small molecule donors with different conjugated π linking bridges: Synthesis and photovoltaic properties
Journal of Semiconductors Pub Date : 2020-12-18 , DOI: 10.1088/1674-4926/41/12/122201
Xiyue Dong 1, 2 , Dingqin Hu 1 , Pengyu Chen 3 , Xuexin Dai 4 , Chao Hu 1 , Zeyun Xiao 1 , Shirong Lu 1
Affiliation  

Three small molecule (SM) donors, namely B-T-CN, B-TT-CN and B-DTT-CN, with different π conjugated bridges were synthesized in this research. Interestingly, with the conjugated fused rings of the π linking bridge increasing, the SM HOMO levels exhibit a decline tendency with –5.27 eV for B-T-CN, –5.31 eV for B-TT-CN and –5.40 eV for B-DTT-CN. After blending the SM donors with the fullerene acceptor PC71BM, the all SM organic solar cells (OSCs) achieved high V ocs of 0.90 to 0.96 V. However, the phase separation morphology and molecule stacking are also unexpectedly changed together with the enhancement of conjugated degree of π bridges, resulting in a lower power conversion efficiency (PCE) for the B-DTT-CN:PC71BM device. Our results demonstrate and provide a useful way to enhance OSC V oc and the morphology needs to be further optimized.



中文翻译:

具有不同共轭 π 连接桥的小分子供体:合成和光伏特性

本研究合成了三种具有不同π共轭桥的小分子(SM)供体,即BT-CN、B-TT-CN和B-DTT-CN。有趣的是,随着π连接桥的共轭稠环增加,SM HOMO能级呈现下降趋势,BT-CN为–5.27 eV,B-TT-CN为–5.31 eV,B-DTT-CN为–5.40 eV . 在将 SM 供体与富勒烯受体 PC 71 BM 混合后,所有 SM 有机太阳能电池 (OSC) 均实现了 0.90 至 0.96 V 的高V ocs。然而,相分离形态和分子堆叠也随着π 桥的共轭度,导致 B-DTT-CN:PC 71的功率转换效率 (PCE) 较低BM 装置。我们的结果证明并提供了一种增强 OSC V oc的有用方法,并且需要进一步优化形态。

更新日期:2020-12-18
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