含炔键的聚合物给体材料设计合成及在有机太阳能电池中的性能研究  

Design,Synthesis,and Performance Study of Polymer Donor Materials with Alkyne Bonds in Organic Solar Cells

作　　者：李大伟 马雪晴 崔新悦 陈亚男 魏楠 言行 李翠红 刘玉强 刘亚辉 薄志山 Da-wei Li;Xue-qing Ma;Xin-yue Cui;Ya-nan Chen;Nan Wei;Xing Yan;Cui-hong Li;Yu-qiang Liu;Ya-hui Liu;Zhi-shan Bo(Beijing Key Laboratory of Energy Conversion and Storage Materials,College of Chemistry,Beijing Normal University,Beijing 100875;College of Textiles&Clothing,State Key Laboratory of Bio-fibers and Eco-textiles,Qingdao University,Qingdao 266071)

机构地区：[1]北京师范大学化学学院能量转换与存储材料北京市重点实验室,北京100875 [2]青岛大学纺织服装学院生物多糖纤维成形与生态纺织国家重点实验室,青岛266071

出　　处：《高分子学报》2024年第1期48-57,共10页Acta Polymerica Sinica

基　　金：国家自然科学基金(基金号22109080,21975031,51933001)资助项目。

摘　　要：利用结构简单、成本低廉的初始原料,设计合成了主链含炔键的聚合物给体材料PBEA-F和PBEA.由于炔键的强吸电子能力,分子的最高占有轨道能级(HOMO)得以降低,使得聚合物的带隙变宽.同时,引入炔键的聚合物给体材料与受体小分子材料BTP-eC9-4F共混制备有机太阳能电池器件,可实现较低的非辐射能量损失与高的开路电压(open circuit voltage,Voc).最终基于PBEA的器件可得到0.91 eV的Voc、20.70 mA/cm^(2)的短路电流密度(short-circuit current density,Jsc)和10.39%的能量转化效率(power conversion efficiency,PCE),远高于PBEA-F器件的PCE (5.50%).We have successfully developed and synthesized polymer donor materials with alkyne bonds incorporated into the main chain,using structurally simple and cost-effective materials.The incorporation of alkyne bonds significantly enhances the electron-withdrawing ability of the polymer backbone,leading to a lower highest occupied molecular orbital(HOMO)energy level and a wider bandgap for the polymer.To further explore the potential applications of these materials,we fabricated organic solar cell(OSC)devices by blending the polymer donor materials with the small molecule acceptor material BTP-eC9-4F.These devices exhibited remarkably low non-radiative energy losses and achieved a high open circuit voltage(Voc).Notably,the device based on PBEA demonstrated exceptional performance,with a Voc of 0.91 V,a short-circuit current density(Jsc)of 20.70 mA/cm^(2),and a power conversion efficiency(PCE)of 10.39%.In comparison,the PBEA-F device only achieved a PCE of 5.50%.These results highlight the superior performance of our designed polymer donor materials,which can be attributed to the introduction of alkyne bonds.The enhanced electron-withdrawing ability of the polymer backbone contributes to the reduction of non-radiative energy losses and the improvement of device performance.Our findings not only demonstrate the potential of these materials for high-performance organic solar cells but also underscore the importance of rational material design in achieving efficient energy conversion.

关 键 词：有机太阳能电池 炔键 给体材料 简单易合成 

分 类 号：TQ317[化学工程—高聚物工业] TM914.4[电气工程—电力电子与电力传动]