Polymer solar cells (PSCs)are composed of a blend film (active layer) of a conjugated polymer donor and a fullerene derivative acceptor sandwiched between a transparent ITO positive electrode and a low workfunction metal negative electrode. PSCs have become the hot research field in recent years

due to their unique advantages of simple fabrication

low cost

light weight and capability to be fabricated into flexible devices. The present research focus is to improve their photovoltaic power conversion efficiency (PCE)

and the key aspects for improving PCE are high efficiency photovoltaic materials. In this paper

I will mainly introduce the recent research progress of Institute of Chemistry

Chinese Academy of Sciences (ICCAS) on the new conjugated polymer donor and fullerene derivative photovoltaic materials

including the donor materials of two-dimensional conjugated polymers with conjugated side chains

conjugated polymers with electron-withdrawing substituents for lower HOMO energy levels

D-A copolymer with broad absorption and lower HOMO energy levels

and the acceptor materials of indene-C

60

bisadduct (ICBA) and indene-C

70

bisadduct. The highest PCE of the PSCs based on the conjugated polymer donor materials reached 7.59 %

which is one of the highest efficiencies reported in literatures so for. The PSCs based on P3HT as donor and our ICBA as acceptor showed PCE higher than 7%

which is the highest efficiency for the PSCs based on P3HT.