基于氟代喹喔啉D-A型共轭聚合物的合成及其光电性能

分别以噻吩、联二噻吩和三联噻吩为给体单元，氟代噻吩基喹喔啉为受体单元，通过Stille反应合成了三种新型的聚合物太阳电池材料（PT-TFQ， PTT-TFQ和PTTT-TFQ），其结构经¹H NMR表征。研究了不同给电子能力的结构单元对其UV-Vis谱光谱、电化学性质以及光伏性能的影响。结果表明，PT-TFQ， PTT-TFQ和PTTT-TFQ氯仿溶液的最大吸收峰分别位于545 nm, 578 nm和649 nm，而薄膜的最大吸收峰相对于溶液的吸收峰分别红移了81 nm, 97 nm和44 nm； PT-TFQ, PTT-TFQ和PTTT-TFQ的开路电压依次降低，分别为0.86 V, 0.60 V和0.50 V；基于三者的器件效率分别为3.19%， 3.10%和2.63%。

Synthesis and Photoelectric Properties of D-A Copolymers Based on 6,7-Difluoroquinoxaline

A series of conjugated copolymers(PT-TFQ, PTT-TFQ and PTTT-TFQ) based on fluorinated thiophenequinoxaline(TFQ) were designed and synthesized by Stille reaction using thiophene, 2,2′-bithiophene or 2,2′∶5′,2″-terthiophene as the donor, and the fluorinated quinoxaline thiophene as the receptor, respectively. The structures were characterized by ¹H NMR. The effects of different number of thiophene rings on UV-Vis absorption spectra, energy levels, electrochemical behavior and photovoltaic performance were systematically investigated. The results showed that λ_max of PT-TFQ, PTT-TFQ and PTTT-TFQ in CHCl₃ solution were 545 nm, 578 nm and 649 nm, and exhibited a red shift of 81 nm, 97 nm and 44 nm in film, respectively. The open circuit voltage of PT TFQ, PTT TFQ and PTTT TFQ were 0.86 V, 0.60 V and 0.50 V, and the polymer solar cells based on them exhibited power conversion efficiencies of 3.19%, 3.10% and 2.63%, respectively.