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设计并合成了一种交叉共轭的(cross-conjugated)缺电子型聚合物单体——二溴代噻吩[2,3-b]并噻吩-吡咯[3,4-c]并吡咯(DPPTTZ)二酮,并将其分别与噻吩(T)、硒吩(Se)和N-甲基吡咯(Py)的双锡试剂进行共聚反应,获得了一类新的供体-受体(D-A)型共轭聚合物光电材料.这类材料分子的最高占有轨道(HOMO)能级较低,因此其光电器件具有较高的开路电压(Voc),稳定性好.此外,它们在紫外-可见光区有较宽的吸收,最大吸收位于波长620 nm附近;能带隙(band gap)小,分别为1.86 e V(p DPPTTZ-T)、1.83 e V(p DPPTTZ-Se)和1.85 e V(p DPPTTZ-Py).器件初步测试结果表明,上述聚合物与PC71BM组成的本体异质结聚合物太阳能电池Voc在0.68~0.81 V之间,能量转化效率(PCE)最高达3.05%(p DPPTTZ-T).
A cross-conjugated electron-poor polymer monomer, dibromothieno [2,3-b] thiophene-pyrrolo [3,4- c] pyrrole (DPPTTZ ) Dione was synthesized and a new class of donor - acceptor (DA) was obtained by copolymerization with bis - tin reagent of thiophene (T), selenophene (Se) and N - methylpyrrole (Py) Type of conjugated polymer photoelectric material.HOMO molecules of these materials have lower energy level and therefore have higher Voc and better stability.In addition, The maximum absorption is at a wavelength of 620 nm and the band gaps are 1.86 eV (p DPPTTZ-T), 1.83 e V (p DPPTTZ-Se) and 1.85 e V (p DPPTTZ-Py) .The device preliminary test results show that the bulk heterojunction polymer solar cell composed of the above polymer and PC71BM has a Voc of 0.68-0.81 V and a maximum PCE of 3.05% (p DPPTTZ-T ).