In this study, low bandgap polymers containing a monofluoroquinoxaline (FQx) or a difluoroquinoxaline (DFQx) as the electron-deficient unit and 2-thiophenylbenzo[1,2-b:4,5-b']dithiophene as the electron-rich unit were synthesized by Stille polymerization. The polymers exhibit satisfactory thermal stability and a broad absorption band from 300 to 650 nm. The HOMO/LUMO energy levels of PB-FQx and PB-DFQx were − 5.62/− 3.64 and − 5.70/− 3.63 eV, respectively. We found that for a high number of fluorine atoms in the conjugated backbone, the HOMO energy levels were deeper, which led to increased V_OC. The PB-DFQx:ITIC-based PSC exhibited the best power conversion efficiency of 6.31%, with its V_OC of 0.99 V, J_SC of 10.61 mA/cm², FF of 60%.

在这项研究中，低带隙聚合物包含单氟喹喔啉（FQx）或二氟喹喔啉（DFQx）作为缺电子单元，并以2-硫代苯基苯并[1,2- b：4,5- b' ]二噻吩作为富电子单元通过Stille聚合反应合成。该聚合物表现出令人满意的热稳定性和300至650 nm的宽吸收带。PB-FQx和PB-DFQx的HOMO / LUMO能级分别为-5.62 /-3.64和-5.70 /-3.63 eV。我们发现，对于共轭主链中的大量氟原子，HOMO能级更深，这导致V _OC增加。基于PB-DFQx：ITIC的PSC的最佳电源转换效率为6.31％，其V _OC为0.99 V，J _SC为10.61mA / cm ²，FF为60％。