By further modulatingthe molecular structure, BNBP-based polymer acceptor, P-BNBPfBT (P22) (Fig. 7) was developed, which is an alternating copolymer of BNBP unit and 3,30-difluoro-2,20-bithiophene (fBT) unit[101]. Because of the locked planar conformation of fBT unitsinduced by the F–S interaction, P-BNBP–fBT exhibited pseudostraight polymer backbone configuration and good crystallinity.Due to the high electron mobility and matching energy levels,all-PSCs based on PTB7–Th/P-BNBP-fBT exhibited a PCE of6.26% with a remarkable Voc of 1.07 V and low energy loss (Eloss)of 0.51 eV. Beaujuge and coworkers developed an all-thiophenesystem n-type polymer, PTPD[2F]T (P2325) (Fig. 7), which iscomposed of thieno[3,4-c]pyrrole-4,6-dione (TPD) and 3,4-difluorothiophene ([2F]T) motifs [102].
By further modulating<br>the molecular structure, BNBP-based polymer acceptor, P-BNBPfBT (P22) (Fig. 7) was developed, which is an alternating copolymer of BNBP unit and 3,30<br>-difluoro-2,20<br>-bithiophene (fBT) unit<br>[101]. Because of the locked planar conformation of fBT units<br>induced by the F–S interaction, P-BNBP–fBT exhibited pseudostraight polymer backbone configuration and good crystallinity.<br>Due to the high electron mobility and matching energy levels,<br>all-PSCs based on PTB7–Th/P-BNBP-fBT exhibited a PCE of<br>6.26% with a remarkable Voc of 1.07 V and low energy loss (Eloss)<br>of 0.51 eV. Beaujuge and coworkers developed an all-thiophene<br>system n-type polymer, PTPD[2F]T (P2325) (Fig. 7), which is<br>composed of thieno[3,4-c]pyrrole-4,6-dione (TPD) and 3,4-<br>difluorothiophene ([2F]T) motifs [102].
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