A New Ester‐Substituted Quinoxaline‐Based Narrow Bandgap Polymer Donor for Organic Solar Cells,Macromolecular Rapid Communications

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A New Ester‐Substituted Quinoxaline‐Based Narrow Bandgap Polymer Donor for Organic Solar Cells
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2020-12-22 , DOI: 10.1002/marc.202000683
Yue Luo ₁ , Yingtong Luo ₁ , Xuelong Huang ₂ , Shengjian Liu ₁ , Zhixiong Cao ₂ , Lingzhi Guo ₁ , Qingduan Li ₁ , Yue-Peng Cai ₁ , Yang Wang ₃

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The electron‐deficient ester group substitution in the sidechain of the commonly used electron‐withdrawing quinoxaline (Qx) unit is seldom studied, while ester‐substituted Qx units possess easy syntheses and facile modulation of the polymer solubility, and the enhanced electron‐withdrawing property of ester substituted Qx unit can theoretically broaden the optical absorption of the resulting polymers and improve the open circuit voltage in the corresponding organic solar cells (OSCs). In this work, a novel ester‐substituted Qx‐based narrow bandgap polymer (NBG) donor material PBDTT‐EFQx, which exhibits an absorption edge of 790 nm (bandgap < 1.6 eV), is designed and synthesized. Results show that the OSCs composed of PBDTT‐EFQx and PC₇₁BM present the highest power conversion efficiency (PCE) of 6.8%, compared to PCEs of 5.0% for PBDTT‐EFQx:ITIC based devices and 4.1% for PBDTT‐EFQx:N2200 based devices, respectively. Characterizations and analyses indicate that the PC₇₁BM‐based OSCs have well‐matched energy levels, better complementary light absorption, the highest and most balanced carrier mobilities, as well as the lowest degree of recombination losses, and therefore, leading to the highest PCE among the three types of OSCs. This work reveals that the ester‐substituted quinoxaline unit is one of the potential building blocks for NBG polymer donors.

中文翻译：

一种新的基于酯取代喹喔啉的窄带隙聚合物供体，用于有机太阳能电池

很少研究常用的吸电子喹喔啉（Qx）单元侧链中的缺电子酯基取代基，而酯取代的Qx单元具有易于合成且易于调节聚合物溶解度和增强的吸电子性的特点。酯取代的Qx单元的理论上，理论上可以拓宽所得聚合物的光吸收范围，并改善相应有机太阳能电池（OSC）中的开路电压。在这项工作中，设计并合成了一种新型的酯取代的基于Qx的窄带隙聚合物（NBG）供体材料PBDTT-EFQx，它的吸收边缘为790 nm（带隙<1.6 eV）。结果表明，由PBDTT-EFQx和PC ₇₁组成的OSCBM的最高功率转换效率（PCE）为6.8％，而基于PBDTT-EFQx：ITIC的设备的PCE分别为5.0％和基于PBDTT-EFQx：N2200的设备的PCE分别为4.1％。特征和分析表明，基于PC ₇₁ BM的OSC具有良好匹配的能级，更好的互补光吸收，最高和最平衡的载流子迁移率以及最低的重组损失程度，因此导致PCE最高在三种类型的OSC中。这项工作表明，酯取代的喹喔啉单元是NBG聚合物供体的潜在组成部分之一。

更新日期：2020-12-22

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