1 research outputs found
Monodisperse Low-Bandgap Macromolecule-Based 5,5′-Bibenzo[c][1,2,5]thiadiazole Swivel Cruciform for Organic Solar Cells
A novel
low bandgap star-like macromolecule was synthesized and applied as
electron donor material in the bulk heterojunction solar cells, in
which the 5,5′-bibenzoÂ[c]Â[1,2,5]Âthiadiazole was used as the
central node, in conjunction with four conjugated donor–acceptor
arms. Compared with the corresponding small molecule with first generation
arms, the macromolecule with second generation branches exhibited
significantly enhanced photovoltaic device performances (blended with
PC71BM as the active layer) due to dramatically improved short-circuit
current density (<i>J</i><sub>sc</sub>) and fill factor
(FF). The improvement in <i>J</i><sub>sc</sub> and FF can
be attributed to the more broad absorption and the more favorable
phase separation when comparing a monodisperse macromolecule with
the second generation arms (SFTBT) with a small molecule with first
generation branches (DFTBT)