title: Improving the efficiency of polymer solar cells based on furan-flanked diketopyrrolopyrrole copolymer via solvent additive and methanol treatment.
abstract: We present a furan-flanked DPP copolymer, poly{3,6-difuran-2-yl-2,5-di(2-octyldodecyl)-pyrrolo [3,4-c]pyrrole-1,4-dione-altthienylenevinylene} (PDVF-8), and highlight the improvement in the power conversion efficiency (PCE) of polymer solar cells (PSCs) based on the PDVF-8 as an electron donor via solvent additive and methanol treatment. When 3 vol% 1,8-diiodooctane (DIO) or 1-chloronaphthalene (CN) were used as a solvent additive to the PDVF-8:PC71BM solution in chloroform (CF), the PCE can increase from 0.79% to 3.73% or 4.26%. Methanol treatment (MT) can further enhance the PCE to 4.03% (DIO) and 4.69% (CN). The effect of the solvent additives (DIO and CN) and MT on the phase separation of the PDVF-8:PC71BM thin film has been investigated in detail using atomic force microscopy, transmission electron microscopy (TEM), TEM-energy dispersive spectroscopy and X-ray photoemission spectroscopy depth profiling.
authors.affiliation: State Key Laboratory of Supramolecular Structure and Materials, Institute of Theoretical Chemistry, Jilin University, Changchun 130012, P. R. China. fhli@jlu.edu.cn.
authors.forename: Weilong
authors.initials: W
authors.lastname: Zhou
authors.forename: Huajie
authors.initials: H
authors.lastname: Chen
authors.forename: Junjie
authors.initials: J
authors.lastname: Lv
authors.forename: Youchun
authors.initials: Y
authors.lastname: Chen
authors.forename: Weifeng
authors.initials: W
authors.lastname: Zhang
authors.forename: Gui
authors.initials: G
authors.lastname: Yu
authors.forename: Fenghong
authors.initials: F
authors.lastname: Li