摘要/Abstract
利用微波协助的Stille缩合聚合反应方法合成了基于双噻吩苯并噻二唑和异靛单元的受体-受体聚合物HFTBT-DA865，并对其热稳定性、光物理性能、电化学性质和本体异质结太阳能电池性能进行了研究.该聚合物易溶于邻二氯苯和邻二甲苯等溶剂，具有优异的溶液加工性能.5%热分解温度为389℃，玻璃化转变温度为168℃，说明其具有较好的热稳定性能.对旋涂速度和温度进行优化，所得太阳能电池器件的光电转换效率为2.28%，开路电压为0.83 V，短路电流为-5.70 mA/cm2，填充因子为48.9%.电化学性能和密度泛函理论估算结果表明，聚合物与受体材料PC71BM相近的最低未占分子轨道（LUMO）值及其平面性可能是影响光伏性质的重要因素.通过调控共聚单体或优化受体材料，器件性能可进一步提高.对受体-受体（A-A）类聚合物材料太阳能电池性能的研究表明，此类材料是一类潜在的聚合物太阳能电池材料.
关键词: 4,7-二噻吩苯并噻二唑, 异靛, 受体-受体共轭聚合物, 光伏, 性质
An acceptor-acceptor polymer HFTBT-DA865 based on dithiophene benzothiadiazole and isoindigo units has been synthesized by Stille polymerizaiton condensation reaction assisted with microwave. The thermal stability, photophysical properties, electrochemical properties and bulk heterojunction solar cells have been researched in details. This polymer is easily soluble in o-dichlorobenzene, o-xylene and so on, and has excellent solution processing properties. Its 5% thermal decompostion is 389℃ and glass transition temperature is 168℃, which show that the polymer has excellent thermal stability. By optimizing spin coating speed and temperature, the maximum photoelectric conversion efficiency of the polymer solar cell based on HFTBT-DA865 is 2.28%, the open circuit voltage is 0.83 V, the short circuit current is -5.70 mA/cm2, and the filling factor is 48.9%. Electrochemical performance and density functional theory estimates show that the lowest unoccupied molecular orbital (LUMO) values and the planarity of polymer and PC71BM may be the key factors affecting the low power conversion efficiency (PCE). The device performance can be further improved by further optimization of the monomer structure and the acceptor materials. This study about the properties of bulk heterojunction (BHJ) polymer solar cell based on acceptor-acceptor (A-A) typed conjugated polymer shows that this type polymer is a potential polymer solar cell material.
Key words: 4,7-dithiophene benzothiadiazlole, isoindigo, acceptor-acceptor conjugated polymer, photovoltaic, property
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