综合研究DPE添加剂对含5,6-二氟-苯并[1,2,5]噻二唑给-受体共聚物的光伏性能影响（英文）  

Comprehensive Study of the Effect of DPE Additive on Photovoltaic Performance of 5,6-Difluoro-benzo[1,2,5] thiadiazole Based Donor-acceptor Copolymers

作　　者：竹芯 朱凯[2] 孙邦锦 樊健[1] 周祎[2] 宋波[2] 

机构地区：[1]江苏省碳基功能材料与器件重点实验室苏州大学功能纳米与软物质研究院苏州纳米科技协同创新中心,苏州215123 [2]苏州大学材料与化学化工学部,苏州215123

出　　处：《化学学报》2017年第5期464-472,共9页Acta Chimica Sinica

基　　金：国家自然科学基金(Nos.21472135,51303118,51673139,91333204);江苏省自然科学基金(BK20151216,BK20161211);苏州纳米科技协同创新中心(CIC-Nano);江苏省高校优势学科建设工程(PAPD);新型功能高分子材料国家地方联合工程实验室共同资助~~

摘　　要：合成了三个以5,6-二氟-苯并[1,2,5]噻二唑为受体,2,5-双-(2-辛基-十二烷氧基)-1,4-双(噻吩并[3,2-b]噻吩基)苯和2,5-双-(2-辛基-十二烷氧基)-1,4-双(硒吩基)苯为给体的给-受体型共聚物(PBT2F-TT-a,PBT2F-TT和PBT2F-Se).这三个聚合物与PC71BM共混制备成了本体异质结聚合物太阳能电池.通过原子力显微镜(AFM)、透射电子显微镜(TEM)、交流阻抗谱(ACIS)、空间电荷限制电流(SCLC)和短路电流密度-入射光光强(JSC-Plight)测试方法系统研究了二苯醚(DPE)对活性层的形貌、载流子迁移率以及光伏性能的影响.实验结果表明DPE有助于提高共混膜载流子的迁移率,同时器件的光伏性能也得到改善.此外,PBT2F-Se器件的SCLC实验数据揭示了平衡的空穴和电子迁移率有利于提高器件的短路电流密度.Three donor-acceptor polymers PBT2F-TT-a, PBT2F-TT and PBT2F-Se were synthesized via Stille cross-coupling reaction with 5,6-difluoro-benzo[1,2,5]thiadiazole as the acceptor, and 2,5-bis-（2-octyl-dodecyloxy）-1,4- di（thieno[3,2-b]thiophen-2-yl）-benzene and 2,5-bis-（2-octyl-dodecyloxy）-l,4-di（selenophen-2-yl）-benzene as the donors. The conjugated backbones of these polymers were decorated with alkoxyl groups to achieve the chain planarity through S……O and Se……O intramolecular interactions. Furthermore, the intramolecular F……H interaction was helpful to minimize the torsional angles. These three polymers were characterized by UV-vis absorption spectroscopy, thermal gravimetric analysis, cyclic voltammetry, gel permeation chromatography and elemental analysis. All the polymers showed intense absorption in the visi- ble range and demonstrated suitable ELUMO and EHOMO, which match well with the fullerene-based acceptor. Thus these three polymers were applied as donors and incorporated with PCTIBM as active materials in bulk heterojunction polymer solar cells （PSCs）. Polymers PBT2F-TT-a and PBT2F-TT are constructed with the same monomers and the latter has a high molecular weight. A notable enhancement in PCE from 3.48% to 4.22% was observed as the molecular weight was increased from 6.79 kDa （PBT2F-TT-a） to 10.36 kDa （PBT2F-TT）. The effect of diphenyl ether （DPE） additive on photovoltaic performance of PSCs based on these polymers has been comprehensively investigated by means of atomic force microscopy （AFM）, trans- mission electron microscopy （TEM）, alternating current impedance spectrometry （ACIS）, space-charge-limited current （SCLC） analysis and short circuit current density - light intensity （Jsc-Plight） measurement. As revealed by AFM and TEM measurement, PBT2F-Se：PC71BM blend with DPE exhibited a nanoscale phase separation dominated with fibrillar struc-tures. On the other hand, the charge carrier mobilities of these blend films were greatly incre

关 键 词：聚合物太阳能电池 二苯醚 含氟受体 链内相互作用 平衡的载流子传输 

分 类 号：TM914.4[电气工程—电力电子与电力传动]