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Biaxially-extended side-chain engineering of benzodithiophene-based conjugated polymers and their applications in polymer solar cells
Organic Electronics ( IF 2.7 ) Pub Date : 2020-01-15 , DOI: 10.1016/j.orgel.2020.105630
Yu-Tai Wong , Po-Chen Lin , Chien-Wei Tseng , Yen-Wen Huang , Yu-An Su , Wen-Chang Chen , Chu-Chen Chueh

Herein, three benzodithiophene (BDT)-based conjugated polymers, PBDTT-FBT, P3TBDT-FBT, and PTBOT-FBT, with gradually increased biaxially-extended side-chain conjugation are synthesized. The increase in the side-chain conjugated plane is revealed to enhance the π-π* transition and intramolecular charge transfer (ICT) of the polymer to result in improved absorption at near-ultraviolet region. Besides, the electron-withdrawing ability of the large side-chain conjugation effectively downshifts the energy levels of the derived polymer. Through providing complementary absorption spectra and suitable cascade energy levels, PTBOT-FBT with the largest side-chain conjugation is demonstrated as an effective third photoactive component for both fullerene and non-fullerene-acceptor (NFA) binary bulk-heterojunction (BHJ) systems, which enables a respective improvement of 2.5% and 11.8% in PCE of the studied fullerene- and NFA-based ternary solar cell devices. Moreover, it is found that the ternary NFA-based BHJ film exhibits a more favorable morphology after adding PTBOT-FBT as compared to the fullerene-based film, suggesting the higher tolerance of the polymers with bulky sidechains in the NFA system.



中文翻译:

苯并二噻吩基共轭聚合物的双轴延伸侧链工程及其在聚合物太阳能电池中的应用

在此,合成了三种苯并二噻吩(BDT)基共轭聚合物PBDTT-FBTP3TBDT-FBTPTBOT-FBT,它们的双轴延伸侧链共轭逐渐增加。揭示了侧链共轭平面的增加可增强聚合物的π-π*跃迁和分子内电荷转移(ICT),从而改善近紫外区域的吸收。此外,大侧链共轭的吸电子能力有效地降低了衍生聚合物的能级。通过提供互补的吸收光谱和合适的级联能级,PTBOT-FBT具有最大侧链共轭的化合物被证明是富勒烯和非富勒烯受体(NFA)二元本体-异质结(BHJ)系统的有效第三种光敏组分,可使PCE的PCE分别提高2.5%和11.8%。研究了基于富勒烯和NFA的三元太阳能电池器件。此外,发现与基于富勒烯的膜相比,基于PTAOT-FBT的三元基于NFA的BHJ膜表现出更有利的形态,表明在NFA体系中具有大侧链的聚合物具有更高的耐受性。

更新日期:2020-01-15
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