Improving Photovoltaic Performance of the Linear A-Ar-A-type Small Molecules with Diketopyrropyrrole Arms by Tuning the Linkage Position of the Anthracene Core.
Improving Photovoltaic Performance of the Linear A-Ar-A-type Small Molecules with Diketopyrropyrrole Arms by Tuning the Linkage Position of the Anthracene Core.
复制标题
DOI：
10.1021/acsami.5b03338
复制
发表时间：
2015-08
影响因子：
9.5
通讯作者：
Xiongwei Duan;Manjun Xiao;Jianhua Chen;Xiangdong Wang;Wenhong Peng;L. Duan;Hua Tan;G. Lei;Renqiang Yang;Weiguo Zhu
中科院分区：
文献类型：
--
作者：
Xiongwei Duan;Manjun Xiao;Jianhua Chen;Xiangdong Wang;Wenhong Peng;L. Duan;Hua Tan;G. Lei;Renqiang Yang;Weiguo Zhu
以二酮吡咯（DPP）的两个受体臂和不同取代蒽（An）的一个平面芳烃核分别合成了两个a - ar - a型小分子DPP2An（9,10）和DPP2An（2,6）。研究了它们的热稳定性、结晶度、光电性能和光伏性能。与含有9,10取代蒽的DPP2An（9,10）相比，含有2,6取代蒽的DPP2An（2,6）具有明显的红移吸收谱和更高的HOMO能级，因为前者具有更好的平面性和更大的共轭体系。结果表明，在1%的1,8-二碘辛烷添加剂作用下，DPP2An（2,6）和PC71BM （w/w,1:1）溶液处理太阳能电池的功率转换效率显著提高了5.44%，短路电流密度（Jsc）达到11.90 mA/cm(2)。PCE和Jsc分别是优化后DPP2An（9,10）基细胞的3.7倍和2.9倍。这项工作表明，改变a - ar - a型SMs中蒽核的连接位置可以强有力地改善有机太阳能电池的光伏性能。
Two isomeric A-Ar-A-type small molecules of DPP2An(9,10) and DPP2An(2,6), were synthesized with two acceptor arms of diketopyrropyrroles (DPP) and a planar aryl hydrocarbon core of the different substituted anthracene (An), respectively. Their thermal stability, crystallinity, optoelectronic, and photovoltaic performances were investigated. Significantly red-shifted absorption profile and higher HOMO level were observed for the DPP2An(2,6) with 2,6-substituted anthracene relative to the DPP2An(9,10) with 9,10-substituted anthracene, as the former exhibited better planarity and a larger conjugate system. As a result, the solution-processing solar cells based on DPP2An(2,6) and PC71BM (w/w,1:1) displayed remarkably increased power conversion efficiency of 5.44% and short-circuit current density (Jsc) of 11.90 mA/cm(2) under 1% 1,8-diiodooctane additive. The PCE and Jsc values were 3.7 and 2.9 times those of the optimized DPP2An(9,10)-based cells, respectively. This work demonstrates that changing the linkage position of the anthracene core in the A-Ar-A-type SMs can strongly improve the photovoltaic properties in organic solar cells.