End‐Capping Effect of a Narrow Bandgap Conjugated Polymer on Bulk Heterojunction Solar Cells

Device performances of BHJ solar cells based on poly(4,4-didodecyldithieno[3,2-b:2’,3’-dsilole)-2,6-diyl-alt-(2,1,3-benzoxadiazole)-4,7-diyl]and PC71BM improve by capping the chain ends with thiophene fragments. This structural modification yields materials that are more thermally robust and that can be used in devices with thicker films – important considerations for enabling the mass production of plastic solar cells. Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.