《Table 1 The performance parameters of ternary PSCs with various mass ratios of donors under 100 mW

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《A chlorinated polymer promoted analogue co-donors for efficient ternary all-polymer solar cells》

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a) Average value±standard deviation were calculated from 20 independent devices

The Figure 1（a）depicts the chemical structures of PTB7-Th，PBClT and NDP-V-C7，respectively.The polymer NDP-V-C7 as an efficient acceptor was reported before[32].The PTB7-Th and PBClTare the analogs in PTB family polymers with only two chlorine atoms difference in polymer conjugated side chains.The PBClT shows slightly blue-shifted absorb spectra and rather deep HOMO level compared with PTB7-Th because of chlorination on the on side-chains of BDT unit as reported in previous study[41].The molecular weight and molecular weight distribution of the polymers are summarized in Table S1（Supporting Information online）.The Figure 1（b）shows the normalized UV-Vis absorptions and molecular energy levels of PTB7-Th，PBCl T and NDP-V-C7.Owing to the strong electrophilic effect of the two chlorine atoms，the LUMO and HOMO levels of PBCl T were obvious declined compared to PTB7-Th from Figure 1（c）.As discussed in this ternary system，the final lowest unoccupied molecular orbital（LUMO）and HOMO levels of PBClT just fall in between those of PTB7-Th and NDP-V-C7.The stepped molecular energy levels of three polymers form a cascade charge transfer for electrons and holes in operation of ternary all-PSCs.The enough energy offsets among the two donors and a acceptor provide the sufficient driving force to dissociate the excitons[39].