Insights into the influence of fluorination positions on polymer donor materials on photovoltaic performance
作者:Xue Gong、Guangwu Li、Jianya Chen、Shiyu Feng、Danyang Ma、Ran Hou、Cuihong Li、Wei Ma、Zhishan Bo
DOI:10.1016/j.orgel.2017.04.009
日期:2017.7
containing two fluorine atoms on the polymer main chain exhibited a slightly narrower absorption ranging from 350 to 650 nm. In addition, fluoro substitution on the polymer main chain can lower the HOMO level of the resulted polymers. As expected, PFH and PFF possess deeper HOMO energy level than PHF. Polymer solar cells (PSCs) were fabricated with these three polymers as donor materials and PC71BM as
为了探索氟取代位置和数量对光学,电化学和光伏性质的影响,通过2,3-二苯基-5,8的Stille缩合反应合成了三种新颖的供体-受体(DA)替代共聚物(PHF,PFH和PFF) -二(噻吩-2-基)喹喔啉(DTQx)受体单元和茚并二噻吩(IDT)供体单元。作为薄膜,在侧向苯基上包含两个氟取代基的PHF和PFF表现出350至700 nm的宽吸收率;而PFH在聚合物主链上含有两个氟原子的聚合物在350至650 nm范围内表现出稍窄的吸收。另外,在聚合物主链上的氟取代可降低所得聚合物的HOMO水平。不出所料,PFH和PFF具有比PHF更深的HOMO能级。用这三种聚合物作为供体材料,PC 71 BM作为受体材料制造了聚合物太阳能电池(PSC)。基于PHF的PSC的功率转换效率(PCE)为7.2%,V oc为0.84 V,J sc为12.46 mA / cm 2,FF为0.69。和PFH基于PSC的PSC的PCE为6