| 초록 |
We delineate the important role of 2D conjugated alkylthiophene side chains of polymers in manipulating the molecular orientation and ordering at the polymer donor/ polymer acceptor (PD/PA) interface in the all-polymer solar cells (all-PSCs). To systematically investigate the impact of 2D conjugated side chains, we synthesized a series of poly(benzo[1,2-b:4,5-b`]-dithiophene-thieno[3,4-c]pyrrole-4,6-dione) (PBDTTPD) polymer donors with different contents of alkoxy and alkylthiophene side chains, from 0 to 100% (P1, 100% alkoxy side chain to P5, 100 % alkylthiophene side chain). The changes in the side chain composition of the polymers induced a strong increasing trend in the efficiencies of all-PSCs, from 2.85% (P1), to 3.17% (P2), to 4.36% (P3), to 5.38% (P4), and to 6.64% (P5). The 2D conjugated side chains promoted localized molecular orientation and ordering relative to the PD/PA interfaces, which led to enhanced exciton dissociation characteristics of the all-PSCs. |
