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A comparative study of the photovoltaic performances of terpolymers and ternary systems

机译：三元共聚物和三元体系光伏性能的比较研究

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Random terpolymers were synthesized from the electron-rich unit thiophene as the donor and two electron-deficient units with complementary absorption as the acceptor. Polymer solar cells (PSCs) fabricated from these terpolymers were compared with those fabricated from the ternary blends of two alternating polymers to explore the best strategy for extending the light absorption range. The two approaches showed similar open-circuit voltages (Voc) but different short-circuit current densities (Jsc). The terpolymer strategy broadened the light absorption range and provided a high power conversion efficiency (PCE) of 5.8%. This is due to a high Jsc and high hole mobility. The device fabricated from the ternary blend exhibited a lower PCE (3.5%) compared to those fabricated from the terpolymers and alternating polymer blends due to the morphological incompatibility of the donor polymers. Our results illustrate the potential of the terpolymer systems as a promising strategy to effectively increase the light absorption and thereby performance of PSCs by combining two morphologically incompatible polymers.
机译：由富电子单元噻吩作为供体和两个具有互补吸收的缺电子单元作为受体合成无规三元共聚物。将由这些三元共聚物制成的聚合物太阳能电池（PSC）与由两种交替聚合物的三元共混物制成的聚合物太阳能电池进行比较，以探索扩大光吸收范围的最佳策略。两种方法显示出相似的开路电压（ V oc ），但短路电流密度不同（ J sc ）。三元共聚物策略拓宽了光吸收范围，并提供了5.8％的高功率转换效率（PCE）。这是由于高 J sc 和高空穴迁移率。与三元共聚物和交替的聚合物混合物制成的装置相比，由三元混合物制成的装置显示出较低的PCE（3.5％），这是由于供体聚合物的形态不相容。我们的结果说明了三元共聚物体系作为通过组合两种形态不相容的聚合物有效提高光吸收从而提高PSC性能的有前景策略的潜力。

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