科研之友
微信
新浪微博
Facebook
分享链接
摘要
Two polymer donor materials, namely pBDT-BTI-EH and pBDT-BTI-ME, were synthesized by copoly. merizing benzodithiophene (BDT) unit with bithiophene imide (BTI) unit containing 2-ethylhexyl and methyl alkyl side chains, respectively. Compared to pBDT-BTI-EH:Y6 based organic solar cells (OSCs), the pBDT-BTI-ME:Y6-based device exhibited higher charge mobilities, reduced charge recombination, more efficient exciton dissociation, and favorable film morphology, which leaded to increased short current density (J(sc)), fill factor (FF) and thus a significant improvement in power conversion efficiency (PCE) from 9.31% to 15.69%.
