新型给体-受体型聚合物的合成及其在本体异质结聚合物太阳能电池中的应用

Synthesis of New Donor-Acceptor Copolymer and Its Application in Organic Bulk Hetero-junction Solar Cells

设计、合成了侧链含有强吸电结构的丙二酸二丁酯受体单元与苯并[1,2-b:4,5-b′]二噻吩给体单元交替共聚物PBDTDT,研究了其热学、光学、电化学性质以及与受体PC71BM([6,6]-苯基C71丁酸甲酯)共混作为活性层制备成本体异质结聚合物有机太阳能电池的光伏性质,考察了PBDTDT与PC71BM不同比例时的光伏性能,当聚合物PBDTDT和PC71BM质量比为1∶3制备的器件,其开路电压达到了0.82 V,能量转换效率(PCE)为0.90%,短路电流为3.25 mA/cm2,填充因子FF为0.338,同时将其与同等工艺制备的poly(3-hexylthiophene)(P3HT)太阳能电池的光伏性能进行比较,相同工艺下制备的P3HT电池的开路电压仅为0.55 V,由PBDTDT制备的电池开路电压比P3HT电池的开路电压高出0.29V,同时分析了PBDTDT能量转换效率较P3HT低的原因.

Alternative copolymer （PBDTDT） was synthesized from acceptor unit with strong electro-withdrawing structure of dibutyl malonate in branch chain and donor unit based on benzo[1,2-b：4,5-b＇]dithiophene. And its thermal, optical, electro- chemical properties and photovoltaic properties blending with [6,6]-phenyl-C71 butyric acid methyl ester as the active layer in the bulk hetero-junction devices of organic solar cells were investigated. The influence of different ratio of polymer PBDTDT and PCvIBM on the photovoltaic properties was also studied. And the open voltage reached 0.82 V, when the weight ratio of PBDTDT and PC71BM is 1 ： 3, and its power conversion efficiency （PCE） was 0.90%, with Voc of 0.82 V, Js of 3.25 mAJcm2 and FF of 33.8%. Comparing with the poly（3-hexylthiophene） （P3HT） in the same method, the solar cells with P3HT blending with PCyIBM as the active layer can only get 0.55 V, which can be lower about 0.29 V than that of the PBDTDT. And the possible factors resulting in low PCE and the higher open voltage than that of P3HT were analyzed.