Chlorinated Polythiophene-Based Donors with Reduced Energy Loss for Organic Solar Cells  

作　　者：Huixue Li Junzhen Ren Lijiao Ma Zhihao Chen Yue Yu Jianqiu Wang Shaoqing Zhang 

机构地区：[1]School of Chemistry and Biological Engineering,University of Science and Technology Beijing,Beijing 100083,China [2]State Key Laboratory of Polymer Physics and Chemistry,Beijing National Laboratory for Molecular Sciences,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China [3]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Chinese Journal of Chemistry》2024年第24期3405-3413,共9页中国化学(英文版)

基　　金：supported by the National Natural Science Foundation of China(22075017).

摘　　要：The industrialization of organic solar cells(OSCs)faces challenges due to complex synthesis routes and high costs of organic photovoltaic materials.To address this,we designed and synthesized a series of polythiophene-based donor materials,PTVT-T-xCl(20%Cl,50%Cl and 100%Cl),by introducing different degrees of chlorine substitution within their conjugated skeletons.The incorporation of chlorine atoms does not change the planar conformation of the conjugated main chain of the control polymer,PTVT-T,but effectively reduces their HOMO energy levels(≤–5.3 eV)and alters the crystallinity of the polymers.In addition,when preparing OSC by blending with non-fused electron acceptor A4T-16,the non-radiative energy loss of the three photovoltaic devices gradually decreased with the increase of chlorine content(0.343,0.278 and 0.189 eV,respectively).Notably,PTVT-T-20%Cl exhibited a more moderate nanoscale phase separation with the acceptor,leading to efficient exciton dissociation,lower bimolecular recombination,and thus a favorable current in the OSCs.Consequently,the photovoltaic device based on PTVT-T-20%Cl:A4T-16 achieved a remarkable photovoltaic efficiency of 11.8%.In addition,the PTVT-T-xCl series polymers show much lower material-only-cost(MOC)values than the other reported photoactive material systems.This work provides the way for the development of low-cost photovoltaic materials and the industrial application of OSC,overcoming previous limitations posed by high energy losses in polythiophene-based donors.

关 键 词：Organic solar cell Low energy loss Simple chemical structure Conjugated polymers Poly(thienylene vinylene) 

分 类 号：O62[理学—有机化学]