Affiliation:
1. College of Textiles & Clothing, State Key Laboratory of Bio‐fibers and Eco‐textiles Qingdao University Qingdao 266071 P. R. China
2. Beijing Key Laboratory of Energy Conversion and Storage Materials College of Chemistry Beijing Normal University Beijing 100875 P. R. China
3. College of Materials Science and Engineering Qingdao University Qingdao 266071 P. R. China
Abstract
AbstractA series of wide bandgap (WBG) conjugated polymers PTFBDT‐C, PTFBDT‐O and PTFBDT‐S are designed and synthesized with alkyl, alkoxy and thioalkyl side chains. By selecting benzodithiophene derivatives as the donor units and benzothiadiazole derivatives as the acceptor units, PTFBDT‐C, PTFBDT‐O and PTFBDT‐S are all of wide optical bandgaps. Furthermore, low bandgap small molecule L8‐BO‐4F is used as the acceptor to fabricate organic solar cells (OSCs). According to the results, PTFBDT‐C:L8‐BO‐4F blend film displays appropriate phase separation, high hole and electron mobilities, etc. Thus, the power conversion efficiency (PCE) of PTFBDT‐C:L8‐BO‐4F based OSCs is 14.02%, which is much higher than those of PTFBDT‐O:L8‐BO‐4F based (9.06%) and PTFBDT‐S:L8‐BO‐4F based ones (10.45%). These results show that the side chain engineering is an effective strategy to improve photovoltaic performance of wide bandgap polymers.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Shandong Province
Subject
Materials Chemistry,Organic Chemistry,Polymers and Plastics,Physical and Theoretical Chemistry,Condensed Matter Physics