Spectroscopic analysis of NIR-dye sensitization in bulk heterojunction polymer solar cells

Abstract

The photovoltaic conversion efficiency for nearinfrared (NIR) sunlight is improved successfully by dye sensitization of bulk heterojunction polymer solar cells, in which the active layer was prepared by a ternary blend of poly(3- hexylthiophene), a fullerene derivative (1-(3-methoxycarbonyl) propyl-1-phenyl-[6,6]-methanofullerene), and an NIR dye, silicon phthalocyanine bis(trihexylsilyl oxide). The mechanism of the NIR-dye sensitization is studied by femtosecond transient absorption spectroscopy. © Royal Swedish Academy of Sciences 2012.