|Title||Diselenogermole as a novel donor monomer for low band gap polymers|
|Publication Type||Journal Article|
|Year of Publication||2015|
|Authors||Z. Fei, R.S. Ashraf, Y. Han, S. Wang, C.P. Yau, P.S. Tuladhar, T.D. Anthopoulos, M.L. Chabinyc, and M.J. Heeney|
|Journal||JOURNAL OF MATERIALS CHEMISTRY A|
We report the synthesis of a new diseleno[3,2-b:2',3'-d] germole (DSG) monomer containing branched 2-ethylhexyl sidechains on the bridging germanium group. The utility of this new electron rich monomer is explored by co-polymerisation of a distannylated DSG monomer with N-octylthienopyrrolodione to afford a soluble low band gap polymer. The DSG containing polymer shows a broader and more red-shifted absorption spectrum compared its thiophene analogue. Polymer solar cells are fabricated from blends with PC71BM exhibiting initial power conversion efficiencies of 5.2% in inverted bulk heterojunction solar cells.