Synthetic Metals ( IF 4.0 ) Pub Date : 2020-12-19 , DOI: 10.1016/j.synthmet.2020.116655 Sangha Keum , Suhee Song , Hye Won Cho , Chan Beom Park , Seong Soo Park , Won-Ki Lee , Jin Young Kim , Youngeup Jin
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 VOC. The PB-DFQx:ITIC-based PSC exhibited the best power conversion efficiency of 6.31%, with its VOC of 0.99 V, JSC of 10.61 mA/cm2, FF of 60%.
中文翻译:
基于具有氟原子的喹喔啉单元的非富勒烯聚合物太阳能电池
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%。