We report a series of bay substituted perylene diimide based donor-acceptor-donor (D-A-D) type small molecule acceptor derivatives such as S-I, S-II, S-III and S-IV for small molecule based organic solar cell (SM-OSC) applications. The electron rich thiophene derivatives such as thiophene, 2-hexylthiophene, 2,20 - bithiophene, and 5-hexyl-2,20 -bithiophene were used as a donor (D), and perylene diimide was used as an acceptor (A). |