含EDOTBT结构单元低能隙聚合物的合成及性能  

Synthesis and Characterization of 4,7-Di(3,4-Ethylenedioxythiophene)-2,1,3-Benzothiadiazole Based Low-Band-Gap Copolymer

作　　者：姚尧[1] 徐延明[1] 李坚[1] 任强[1] 汪称意[1] 盛刚 

机构地区：[1]江苏省太阳能电池材料与技术重点实验室常州大学材料科学与工程学院,江苏常州213164 [2]江苏欧密格光电科技股份有限公司,江苏常州213164

出　　处：《高分子材料科学与工程》2015年第11期19-24,共6页Polymer Materials Science & Engineering

基　　金：江苏省大学生实践创新训练计划省级重点项目(201310292004Z)

摘　　要：采用Heck反应制备了以3,4-乙撑二氧噻吩(EDOT)为供体,苯并噻二唑(BT)为受体的D-A型单体4,7-二(3,4-乙撑二氧噻吩)-苯并噻二唑(EDOTBT);采用Suzuki反应合成了一种低能隙的共轭聚合物4,7-二(3,4-乙撑二氧噻吩)-苯并噻二唑-芴共聚物(PEDOTBTF6)。通过核磁共振、热失重、凝胶渗透色谱、紫外-可见光光谱、循环伏安等对其进行了分析研究。结果表明,成功合成了单体EDOTBT及共轭聚合物PEDOTBTF6,所得共聚物具有较高的相对分子质量,在有机溶剂中具有较好的溶解性,且具有良好的热稳定性。PEDOTBTF6具有较低的能带隙,其光学带隙宽为1.65eV。通过循环伏安法测得其HOMO和LUMO能级分别为-5.23eV,-3.58eV。由该共聚物制备的聚合物太阳能电池具有良好的光电性能。初步研究表明,当退火温度为160℃,退火时间为20min时,所得到的聚合物太阳能电池的短路电流(Jsc)为1.6mA/cm2;开路电压(Voc)为0.5V;光电转换效率(PCE)为0.21%。4,7-Di （3,4-Ethylenedioxythiophene）-2, 1,3-benzothiadiazole （EDOTBT） was synthesized by Heck coupling reaction between 3,4-ethylenedioxythiophene （EDOT） and 4,7-dibromo-2,1,3-benzothiadiazole （BT）. The low-band-gap copolymer of poly[ 4,7-di （3,4-ethylenedioxythiophene）-2,1,3-benzothiadiazole-9,9-dihexyl-fluorene ] （PEDOTBTF6） was then synthesized by Suzuki Coupling. The structure and properties of copolymer were investigated by 1H-NMR, GPC, UV-visible absorption spectra and photoluminescence spectra. The results show that a new low-band-gap conjugated copolymer （PEDOTBTF6）is successfully synthesized with the number average molecular weight （Mn） of 22000. It has good solubility in common solvents and good thermal stability. The copolymer exhibits a broad absorption spectra and a relatively low optical band gap of 1.65 eV. The HOMO and LUMO energy levels are - 5.23 eV, - 3.58 eV, respectively, which is estimated by cyclic voltammogram method. The photovoltaic properties of the copolymer with the device structure of ITO/PEDPT：PSS（35 nm）/PEDOTBTF6 ： PCBM（80 nm）/Al（150 nm） were investigated as well. The device has the short current density of 1.6 mA/cm2, open circuit voltage of 0.5 V, fill factor of 0.26 and photoelectric conversion efficiency of 0.21%, respectively when the device is annealed at 160 ℃ for 20 min.

关 键 词：Suzuki偶合反应 D-A型共轭聚合物 低能隙 聚合物太阳能电池 

分 类 号：TQ316.33[化学工程—高聚物工业]