POSSIBLE REARRANGEMENT OF DIALKYL-2H- BENZIMIDAZOLE AND ITS IMPLICATION TO PERFORMANCE OF ORGANIC SOLAR CELLS: A DENSITY FUNCTIONAL THEORY STUDY

摘要

Low band-gap copolymers are used in organic solar cells for better harvesting of the solar spectrum. It is well known that alternating donor and acceptor units generally lowers the band gap of the polymer. A great deal of effort in developing high-efficiency solar cells is focused on finding the optimum combination of donor and acceptor units.