氮桥连星型稠环电子受体的合成与光伏性能  

Synthesis and photovoltaic performance of nitrogen-bridged starshaped fused-ring electron acceptors

作　　者：王卫杰 安睿琪 王统 吴晓甫[1] 童辉[1] 王利祥[1] Weijie Wang;Ruiqi An;Tong Wang;Xiaofu Wu;Hui Tong;Lixiang Wang(Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China)

机构地区：[1]中国科学院长春应用化学研究所,高分子物理与化学国家重点实验室,长春130022

出　　处：《中国科学：化学》2022年第11期2104-2112,共9页SCIENTIA SINICA Chimica

基　　金：国家自然科学基金(51973211,51833009,22075272)资助项目。

摘　　要：采用苯并三(二噻吩并吡咯)为稠环骨架,5,6-二氯-3-(二氰基亚甲基)靛酮为拉电子端基,设计合成了一种氮桥连星型稠环电子受体.利用强给电子苯并三(二噻吩并吡咯)稠环骨架与氯取代拉电子端基结合,增强分子内电荷转移,导致电子受体分子的吸收位于500~800 nm、摩尔消光系数为3.2×10^(5)Mcm、光学带隙为1.56 eV.将其分别与吸收互补的宽带隙聚合物给体PM6和D18共混作为活性层,制备了有机太阳能电池器件.相比PM6为给体,受体分子与D18的共混膜具有更强的结晶性和合适的纤维状互穿网络相分离结构.通过对比两组器件载流子输运与复合特性,发现采用D18作为给体使电荷传输更平衡、复合减弱、激子解离和电荷收集更有效,其电池器件的能量转换效率为12.0%.A new nitrogen-bridged star-shaped fused-ring electron acceptor(BTDTP-C8C9-6Cl)with benzo[1,2-b:3,4-b′-5,6-b′′]tri(4-H-dithieno[3,2-b:2′,3′-d]pyrrole)as a fused ring skeleton and 5,6-dichloro-3-(dicyano methylene)indone as end groups has been designed and synthesized.The electron acceptor shows a strong intramolecular charge transfer absorption in the range of 500–800 nm with the molar extinction coefficient of 3.2×10^(5)Mcmand the optical bandgap of 1.56 eV.Two wide bandgap polymer donors,PM6 and D18,which have complementary absorption spectra with BTDTP-C8C9-6Cl,are blended with BTDTP-C8C9-6Cl to fabricate organic solar cell devices,respectively.Compared with the blend film based on PM6 and BTDTP-C8C9-6Cl,the blend film based on D18 and BTDTP-C8C9-6Cl shows stronger crystallinity and more suitable fibrous interpenetrating network phase separation morphology.The investigation of the charge transport and recombination behaviors reveals that the device based on D18:BTDTP-C8C9-6Cl exhibits more balanced charge transport,weakened recombination,and effective exciton dissociation and charge collection.Finally,the organic solar cell device based on D18:BTDTP-C8C9-6Cl achieves power conversion efficiencies of 12.00%.

关 键 词：星型结构 稠环电子受体 氮桥 有机太阳能电池 能量转换效率 

分 类 号：O626[理学—有机化学] TM914.4[理学—化学]