Diketopyrrolopyrrole(DPP) was introduced to Donor-acceptor polymers due to its excellent copianarity and strong ability of electron-withdrawing. It controls energy level as well as band gap to broaden responding range of visible spectrum. To date
DPP based polymers have attracted widespread attention and aquired a photoelectric conversion efficiency of 9. 64%. This paper studies the research of donor-acceptor narrow band gap polymers
which
DPP unit act as accepter and some electron-rich group such as thiophene derivatives
benzodithiophene (BDT) as donor. As well as inner relation of structrue of material and properties of polymer solar cells.