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The regioisomeric bromination effects of fused-ring electron acceptors: modulation of the optoelectronic property and miscibility endowing the polymer solar cells with 15% efficiency
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-11-03 , DOI: 10.1039/d0ta09707a Jianchao Jia 1, 2, 3, 4, 5 , Jianhua Jing 5, 6, 7, 8, 9 , Tao Jia 5, 6, 7, 8, 9 , Kai Zhang 5, 6, 7, 8, 9 , Jie Zhang 5, 6, 7, 8, 9 , Jiabin Zhang 5, 6, 7, 8, 9 , Fei Huang 5, 6, 7, 8, 9 , Chuluo Yang 1, 2, 3, 4, 5
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-11-03 , DOI: 10.1039/d0ta09707a Jianchao Jia 1, 2, 3, 4, 5 , Jianhua Jing 5, 6, 7, 8, 9 , Tao Jia 5, 6, 7, 8, 9 , Kai Zhang 5, 6, 7, 8, 9 , Jie Zhang 5, 6, 7, 8, 9 , Jiabin Zhang 5, 6, 7, 8, 9 , Fei Huang 5, 6, 7, 8, 9 , Chuluo Yang 1, 2, 3, 4, 5
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Minimizing the trade-off between JSC and VOC has been identified as a critical strategy for optimizing the device performance with the advance of polymer solar cells (PSCs). Here, two regioisomerically brominated fused-ring electron acceptors, namely BTPIC-2Br-5 and BTPIC-2Br-6, were synthesized and the effects of the bromination position on the basic optoelectronic properties, physiochemical properties, charge transport properties, BHJ morphologies, and the photovoltaic performance were investigated. It was found that BTPIC-2Br-6, which had one bromine substitution at the 6-position, showed a narrower absorption, upshifted highest occupied molecular orbital (HOMO), and downshifted lowest unoccupied molecular orbital (LUMO) energy levels in comparison with BTPIC-2Br-5. Such a minute variation provides an opportunity for fine-tuning the VOC–JSC trade-off for a better solar cell. The results showed that the BTPIC-2Br-6-based device realized a very high PCE of over 15% because the higher JSC and FF compensated for the VOC decline. The detailed morphology study revealed that the BTPIC-2Br-6-based blend film had a better phase separation, which mainly resulted in a more balanced charge transport and weaker trap-assisted recombination in the device. The interaction parameter determination for the material combinations further manifested that BTPIC-2Br-6 tends to easily form an intermixed morphology, which established a material structure–morphology relationship. This study underlines the regioisomeric bromination effect of FREAs on the material optoelectronic properties and miscibility, thereby optimizing the photovoltaic efficiency.
中文翻译：
稠环电子受体的区域异构溴化作用：光电子性质的调节和聚合物太阳能电池的混溶性，效率为15％
最小化J SC和V OC之间的权衡随着聚合物太阳能电池（PSC）的发展，已被确定为优化器件性能的关键策略。在这里，合成了两个区域异构溴化的稠环电子受体，分别为BTPIC-2Br-5和BTPIC-2Br-6，并且溴化位置对基本光电性能，理化性能，电荷传输性能，BHJ形态和研究了光伏性能。发现与PICPIC相比，在6位上有一个溴取代的BTPIC-2Br-6显示出更窄的吸收，上移的最高占据分子轨道（HOMO）和下移的最低未占用分子轨道（LUMO）能级。 -2Br-5。这种微小的变化为微调V OC提供了机会–为了获得更好的太阳能电池，需要进行J SC权衡。结果表明，基于BTPIC-2Br-6的器件实现了非常高的PCE，超过15％，因为较高的J SC和FF补偿了V OC下降。详细的形态学研究表明，基于BTPIC-2Br-6的共混膜具有更好的相分离，这主要导致器件中的电荷传输更加平衡，陷阱辅助重组更弱。确定材料组合的相互作用参数进一步表明，BTPIC-2Br-6易于形成相互混合的形态，从而建立了材料结构与形态的关系。这项研究强调了FREA的区域异构溴化对材料的光电性能和可混溶性的影响，从而优化了光伏效率。
更新日期：2020-11-23
中文翻译：
稠环电子受体的区域异构溴化作用：光电子性质的调节和聚合物太阳能电池的混溶性，效率为15％
最小化J SC和V OC之间的权衡随着聚合物太阳能电池（PSC）的发展，已被确定为优化器件性能的关键策略。在这里，合成了两个区域异构溴化的稠环电子受体，分别为BTPIC-2Br-5和BTPIC-2Br-6，并且溴化位置对基本光电性能，理化性能，电荷传输性能，BHJ形态和研究了光伏性能。发现与PICPIC相比，在6位上有一个溴取代的BTPIC-2Br-6显示出更窄的吸收，上移的最高占据分子轨道（HOMO）和下移的最低未占用分子轨道（LUMO）能级。 -2Br-5。这种微小的变化为微调V OC提供了机会–为了获得更好的太阳能电池，需要进行J SC权衡。结果表明，基于BTPIC-2Br-6的器件实现了非常高的PCE，超过15％，因为较高的J SC和FF补偿了V OC下降。详细的形态学研究表明，基于BTPIC-2Br-6的共混膜具有更好的相分离，这主要导致器件中的电荷传输更加平衡，陷阱辅助重组更弱。确定材料组合的相互作用参数进一步表明，BTPIC-2Br-6易于形成相互混合的形态，从而建立了材料结构与形态的关系。这项研究强调了FREA的区域异构溴化对材料的光电性能和可混溶性的影响，从而优化了光伏效率。
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