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,respect...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(Jsc),fill factor(FF)and thus a significant improvement in power conversion efficiency(PCE)from 9.31%to 15.69%.展开更多
文摘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(Jsc),fill factor(FF)and thus a significant improvement in power conversion efficiency(PCE)from 9.31%to 15.69%.
