A series of low band-gap conjugated polymers (PDTC, PDTSi and PDTP) containing electron-rich C-, Si-, and N-bridged bithiophene and electron-deficient thienopyrroledione units were synthesized viaStille coupling polymerization. All these polymers possess a low-lying energy level for the highest occupied molecular orbital (HOMO) (as low as −5.44 eV). As a result, photovoltaic devices derived from these polymers show high open circuit voltage (Voc as high as 0.91 V). These rigid polymers also possess respectable hole mobilities of 1.50 × 10−3, 6.0 × 10−4, and 3.9 × 10−4 cm2 V−1s−1 for PDTC, PDTSi, and PDTP, respectively. The combined high Voc and good hole mobility enable bulk hetero-junction photovoltaic cells to be fabricated with relatively high power conversion efficiency (PCE as high as 3.74% for the PDTC-based device).
通过Stille偶联聚合反应,合成了一系列含有富电子C-、Si-和N-桥联双
噻吩以及缺电子
噻吩吡咯二酮单元的低带隙共轭聚合物(PDTC、PD
TSi和PDTP)。所有这些聚合物都具有较低的最高占据分子轨道(HOMO)能量
水平(低至 −5.44 eV)。因此,由这些聚合物衍生出的光伏器件显示出较高的开路电压(Voc高达0.91 V)。这些刚性聚合物还分别具有可观的空穴迁移率,PDTC、PD
TSi和PDTP的空穴迁移率分别为1.50 × 10−3、6.0 × 10−4和3.9 × 10−4 cm2 V−1s−1。高Voc和良好的空穴迁移率的结合,使得能够制备出具有相对较高功率转换效率(PCE,PDTC基器件的PCE高达3.74%)的体异质结光伏电池。