Star-shaped and linear ?-conjugated oligomers consisting of a tetrathienoanthracene core and multiple diketopyrrolopyrrole arms for organic solar cells.

ABSTRACT: Solution-processable star-shaped and linear ?-conjugated oligomers consisting of an electron-donating tetrathienoanthracene (TTA) core and electron-accepting diketopyrrolopyrrole (DPP) arms, namely, TTA-DPP4 and TTA-DPP2, were designed and synthesized. Based on density functional theory calculations, the star-shaped TTA-DPP4 has a larger oscillator strength than the linear TTA-DPP2, and consequently, better photoabsorption property over a wide range of visible wavelengths. The photovoltaic properties of organic solar cells based on TTA-DPP4 and TTA-DPP2 with a fullerene derivative were evaluated by varying the thickness of the bulk heterojunction active layer. As a result of the enhanced visible absorption properties of the star-shaped ?-conjugated structure, better photovoltaic performances were obtained with relatively thin active layers (40-60 nm).

SUBMITTER: Komiyama H 

PROVIDER: S-EPMC4979874 | biostudies-literature | 2016

REPOSITORIES: biostudies-literature