Large branched alkylthienyl bridged naphtho[1,2-c:5,6-c ']bis[1,2,5]thiadiazole-containing low bandgap copolymers: Synthesis and photovoltaic application
Large branched alkylthienyl bridged naphtho[1,2-c:5,6-c ']bis[1,2,5]thiadiazole-containing low bandgap copolymers: Synthesis and photovoltaic application
复制标题
DOI：
10.1080/10601325.2017.1265404
复制
发表时间：
2017
影响因子：
2.5
通讯作者：
Xia Yangjun
中科院分区：
文献类型：
--
作者：
Tong Junfeng;An Lili;Li Jianfeng;Zhang Peng;Guo Pengzhi;Yang Chunyan;Su Qiang;Wang Xunchang;Xia Yangjun
两种供体-受体（D-A）型低带隙（LBG）交替共轭共聚物，具有较大的共轭平面度和较强的电吸能力萘[1,2-c:5,6-c ']和[1,2,5]噻二唑（NT）单元，即聚[4,8-二（5-（正辛基硫基）硫-2-基）-苯并[1,2-b:4,5-b ']二噻吩-2,6-二烷基- 2,9 -二（4-（2-癸基十四烷基）硫-2-基）萘- [1,2-c:5,6-c ']二噻唑-5,5 ' -二基]（PBDT-TS-DTNT-DT）和聚[4,8-二（三异丙基硅乙基）苯并[1,2-b:4,5-b ']二噻吩-2,6-二基-4,9-二（4-（2-癸基十四烷基）硫-2-基）萘[1,2-c:5,6-c ']二噻唑-5,5 ' -二基](PBDT-TIPS-DTNT-DT)，通过凝胶渗透色谱（GPC）、紫外-可见吸收（UV-Vis）、热重分析（TGA）、循环伏安法（CV）等对产物进行了表征。pbdt - ts - dtnt - dt和pbdt - tips - dtnt - dt分别表现出更宽的吸收和更深的最高已占据分子轨道（HOMO）能级，分别约为−5.45和−5.62 eV。以所得聚合物和[6,6]苯基- c61丁酸甲酯（PC61BM）共混物为基础，以ITO/PFN/聚合物：PC61BM/MoO3/Ag为器件构型，制备并研究了块状异质结太阳能电池。结果表明，在AM1.5仿真器（100 mWcm−2）下，pbdt - ts - dtnt - dt /PC61BM （w:w, 1:2）和pbdt - tips - dtnt - dt /PC61BM （w:w, 1:1）的功率转换效率分别为2.67%和0.64%，开路电压（VOC）分别为0.86和1.05 V，短路电流（JSC）分别为5.41和0.97 mA cm−2，填充系数（FF）分别为57.8%和62.4%。
Two donor-acceptor (D-A) type low bandgap (LBG) alternating conjugated copolymers containing larger conjugation planarity and stronger electro-withdrawing ability naphtho[1,2-c:5,6-c′]bis[1,2,5]thiadiazole (NT) unit, namely, poly[4,8-bis(5-(n-octylthio)thien-2-yl)-benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl-alt-4,9-bis(4-(2-decyltetradecyl)thien-2-yl)naphtho- [1,2-c:5,6-c′]bis[1,2,5]thiadiazole-5,5′-diyl] (PBDT-TS-DTNT-DT) and poly[4,8-bis(triiso-propylsilylethynyl)benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl-alt-4,9-bis(4-(2-decyltetradecyl)-thien-2-yl)naphtho[1,2-c:5,6-c′]bis[1,2,5]thiadiazole-5,5′-diyl] (PBDT-TIPS-DTNT-DT), were prepared by the palladium-catalyzed Stille polycondensation and characterized by gel permeation chromatography (GPC), UV-Vis absorption, thermal gravimetric analysis (TGA), cyclic voltammetry (CV)etc.PBDT-TS-DTNT-DTandPBDT-TIPS-DTNT-DTshow the broader absorption and deeper highest occupied molecular orbital (HOMO) energy level approximately −5.45 and −5.62 eV, respectively. Bulk-heterojuction solar cells based on the resulted polymers and [6,6] phenyl-C61butyric acid methyl ester (PC61BM) blends, with the device configuration of ITO/PFN/polymer:PC61BM/MoO3/Ag were prepared and investigated. The results showed the power conversion efficiency (PCE) of 2.67% forPBDT-TS-DTNT-DT/PC61BM (w:w, 1:2) and 0.64% forPBDT-TIPS-DTNT-DT/PC61BM (w:w, 1:1), with relatively high open-circuit voltage (VOC) of 0.86 and 1.05 V, small short-circuit current (JSC) of 5.41 and 0.97 mA cm−2and moderate fill factor (FF) of 57.8% and 62.4%, under an AM1.5 simulator (100 mWcm−2), respectively.