Premium
Syntheses and Properties of Copolymers with N ‐Alkyl‐2,2′‐bithiophene‐3,3′‐dicarboximide Unit for Polymer Solar Cells
Author(s) -
Kim Juae,
Kim Shin Hyun,
Kim Taehyo,
Shim Joo Young,
Park Dongkyung,
Kim Jinwoo,
Kim Il,
Kim Jin Young,
Suh Hongsuk
Publication year - 2015
Publication title -
bulletin of the korean chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.237
H-Index - 59
ISSN - 1229-5949
DOI - 10.1002/bkcs.10435
Subject(s) - materials science , stille reaction , alkyl , polymer , copolymer , polymerization , conjugated system , absorption spectroscopy , polymer chemistry , polymer solar cell , crystallography , photochemistry , chemistry , organic chemistry , optics , physics , composite material
We report new random copolymers using the electron-deficient unit N-alkyl-2,2'-bithiophene-3,3'-dicarboximide (BTI) for organic solar cells. For absorption over a broader range of the solar spectrum, push-pull types of conjugated polymers PBTIBDT-3, PBTIBDT-5, and PBTIBDT-7, containing 4,8-bis(2-octyldodecyloxy) benzo[1,2-b; 3,4-b'] dithiophene (BDT) as electron-pushing unit and BTI as electron-pulling unit, were synthesized. The polymers were synthesized by coupling electron-pushing and electron-pulling units by Stille polymerization with Pd(0) catalyst. The incorporation of more BTI units induced more red shift of the absorption spectra of the polymer thin films. The device comprising PBTIBDT-5 and PC71BM (1:1) showed V-OC = 0.76 V, J(SC) = 3.28 mA/cm(2), and fill factor (FF) = 0.51, giving a power conversion efficiency of 1.26%open