Title of article :
Solution processable low bandgap small molecule donors with naphthalene end-groups for organic solar cells
Author/Authors :
Liu، نويسنده , , Ying and Du، نويسنده , , Xiaoyan and Xiao، نويسنده , , Zuo and Cao، نويسنده , , Jiamin and Tan، نويسنده , , Songting and Zuo، نويسنده , , Qiqun and Ding، نويسنده , , Liming، نويسنده ,
Issue Information :
دوماهنامه با شماره پیاپی سال 2012
Abstract :
Three new low bandgap donor–acceptor–donor (D–A–D) type small molecules (M1–M3) containing naphthalene, thiophene, and diketopyrrolopyrrole were synthesized by Suzuki and Stille coupling reactions. The thermal, optical, electrochemical and photovoltaic properties of these molecules were investigated. These materials possess strong absorption at 475–750 nm and low-lying HOMO levels (−5.28 to −5.35 eV). Solution-processed bulk heterojunction solar cells based on M1–M3/PC71BM blends (1:1, w/w) demonstrate power conversion efficiencies (PCEs) as high as 2.59%, with a short-circuit current density (Jsc) of 6.83 mA/cm2, and an open-circuit voltage (Voc) of 0.88 V under AM1.5G irradiation (100 mW/cm2). Naphthalene-ended M1 and M3 show higher photovoltaic performance than M2 due to broad absorption and better morphology of the devices.
Keywords :
Solution-processed organic solar cells , Diketopyrrolopyrrole , naphthalene , Donor–acceptor–donor type molecules
Journal title :
Synthetic Metals
Journal title :
Synthetic Metals