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首页> 外文期刊>Journal of Applied Polymer Science >New low bandgap conjugated polymer derived from 2, 7-carbazole and 5, 6-bis(octyloxy)-4, 7-di(thiophen-2-yl) benzothiadiazole: Synthesis and photovoltaic properties
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New low bandgap conjugated polymer derived from 2, 7-carbazole and 5, 6-bis(octyloxy)-4, 7-di(thiophen-2-yl) benzothiadiazole: Synthesis and photovoltaic properties

机译：由2，7-咔唑和5，6，-双（辛氧基）-4，7-二（噻吩-2-基）苯并噻二唑衍生的新型低带隙共轭聚合物：合成和光电性能

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摘要

To develop conjugated polymers with low bandgap, deep HOMO level, and good solubility, a new conjugated alternating copolymer PC-DODTBT based on N-9′-heptadecanyl-2,7-carbazole and 5, 6-bis(octyloxy)-4,7-di(thiophen-2- yl)benzothiadiazole was synthesized by Suzuki cross-coupling polymerization reaction. The polymer reveals excellent solubility and thermal stability with the decomposition temperature (5% weight loss) of 327°C. The HOMO level of PC-DODTBT is -5.11 eV, indicating that the polymer has relatively deep HOMO level. The hole mobility of PC-DODTBT as deduced from SCLC method was found to be 2.03 × 10~(-4) cm~2/Versus Polymer solar cells (PSCs) based on the blends of PC-DODTBT and [6,6]-phenyl-C_(71)-butyric acid methyl ester (PC_(71)BM) with a weight ratio of 1:2.5 were fabricated. Under AM 1.5 (AM, air mass), 100 mW/cm~(-2) illumination, the devices were found to exhibit an open-circuit voltage (V_(oc)) of 0.73 V, short-circuit current density (J_(sc)) of 5.63 mA/cm~(-2), and a power conversion efficiency (PCE) of 1.44%. This photovoltaic performance indicates that the copolymer is promising for polymer solar cells applications.
机译：为了开发具有低带隙，高HOMO水平和良好溶解性的共轭聚合物，一种基于N-9'-十七烷基-2,7-咔唑和5，6-双（辛氧基）-4的新型共轭交替共聚物PC-DODTBT通过铃木交叉偶联聚合反应合成了7-二（噻吩-2-基）苯并噻二唑。该聚合物在327°C的分解温度下（重量损失5％）显示出优异的溶解性和热稳定性。 PC-DODTBT的HOMO能级为-5.11 eV，表明该聚合物具有相对较深的HOMO能级。根据SCLC方法推导的PC-DODTBT的空穴迁移率是2.03×10〜（-4）cm〜2 /对，基于PC-DODTBT和[6,6]-的聚合物太阳能电池（PSC）。制备了重量比为1：2.5的苯基-C_（71）-丁酸甲酯（PC_（71）BM）。在AM 1.5（AM，空气质量），100 mW / cm〜（-2）的光照下，发现这些器件的开路电压（V_（oc））为0.73 V，短路电流密度为（J_（ sc））为5.63 mA / cm〜（-2），功率转换效率（PCE）为1.44％。这种光伏性能表明该共聚物有望用于聚合物太阳能电池。

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