Development of Large Band-Gap Conjugated Copolymers for Efficient Regular Single and Tandem Organic Solar Cells
Development of Large Band-Gap Conjugated Copolymers for Efficient Regular Single and Tandem Organic Solar Cells
复制标题
用于高效常规单层和串联有机太阳能电池的大带隙共轭共聚物的开发
DOI：
10.1021/ja406220a
复制
发表时间：
2013-09-11
影响因子：
15
通讯作者：
Peng, Qiang
中科院分区：
文献类型：
--
作者：
Li, Kai;Li, Zuojia;Peng, Qiang
我们证明了两个共轭共聚物，PBDTFBZO和PBDTFBZS，由二烷基硫醇取代的苯并[1，2-B：4，5-b ']二噻吩供体和单氟化苯并三唑受体嵌段组成的合成和表征。所得共聚物显示出大的带隙，深HOMO和LUMO能级。同时获得了改进的V-oc、J（sc）和FF，以提高其单层和叠层聚合物太阳能电池的总体效率。通过在聚合物主链上引入二烷基硫醇和氟取代基，可以将增强的V-oc归因于低HOMO能级。J（sc）和FF的改善可能是由于高载流子迁移率、抑制的电荷复合和精细的纳米结构形态。基于PBDTFBZS：PC 71 BM共混膜和3%1，8-二碘辛烷（DIO）添加剂的常规单个器件实现了7.74%PCE。与基于低带隙二酮基吡咯并吡咯（DPP）的共聚物组合，基于PBDTFBZS的串联器件表现出高达9.40%的PCE。结果表明，PBDTFBZO和PBDTFBZS是未来大面积聚合物太阳能电池应用的有前途的聚合物给体材料。
We demonstrated the synthesis and characterization of two conjugated copolymers, PBDTFBZO and PBDTFBZS, consisting of dialkylthiol substituted benzo[1,2-b:4,5-b']dithiophene donor and monofluorinated benzotriazole acceptor blocks. The resulting copolymers show large band gaps, deep HOMO and LUMO energy levels. Improved V-oc, J(sc), and FF were obtained at the same time to increase overall efficiencies of their single and tandem polymer solar cells. The enhanced V-oc can be ascribed to a low-lying HOMO energy level by incorporating dialkylthiol and fluorine substituents on the polymer backbone. The improvement in J(sc) and FF are likely due to high carrier mobility, suppressed charge recombination, and fine nanostructure morphology. A 7.74% PCE was achieved from the regular single device based on PBDTFBZS:PC71BM blend film with 3% 1,8-diiodooctane (DIO) additive. In combination with low band gap diketopyrrolopyrrole (DPP)-based copolymer, tandem devices based on PBDTFBZS exhibited high PCE up to 9.40%. The results indicate that PBDTFBZO and PBDTFBZS are promising polymer donor materials for future application of large-area polymer solar cells.