Soluble acetylenic molecular glasses based on dithienyldiketopyrrolopyrrole for organic solar cells

摘要: Abstract We present the synthesis and photovoltaic response of soluble glass-forming molecules containing a dithienyldiketopyrrolopyrrole core difluorenylarylamine endgroups, linked through an acetylene bond. Introducing 2,6-naphthylene moiety vs. 1,4-phenylene leads to increased glass transition temperature ( T g ) hole mobility. Thus,  = 107.7 °C, μ h  = 7.95 × 10 −5  cm 2  V −1  s for 1,4- phenylene compound, while  = 119.4 °C,  = 9.17 × 10 compound. Thermal annealing as-cast films both compounds below resulted in little change optical absorption. The preliminary characterization bulk hetero-junction solar cells showed that compound generally provides higher power conversion efficiency than due probably its enhanced transport. photoluminescence experiments show weak exciplex emission around 880 nm blends new dyes PC 61 BM. work may be useful further efforts toward high-performance cost-effective acetylenic organic semiconductors with thermally stable morphology.