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Synthesis and Photovoltaic Properties of a New Low‐Bandgap Polymer Consisting of Benzodithiophene and Fluorinated Benzoselenadiazole Units
Author(s) -
Shin Seung Ah,
Kim JiHoon,
Park Jong Baek,
Kang InNam,
Park MooJin,
Hwang DoHoon
Publication year - 2013
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201300308
Subject(s) - materials science , homo/lumo , conjugated system , acceptor , open circuit voltage , polymer , band gap , polymer chemistry , chemistry , organic chemistry , optoelectronics , composite material , voltage , molecule , physics , quantum mechanics , condensed matter physics
A donor–acceptor‐type conjugated alternating copolymer (PBDT–DFBSe) consisting of benzodithiophene (BDT) and a fluorinated 2,1,3‐benzoselenadiazole derivative (DFBSe) is synthesized using Stille cross‐coupling. The optical, electrochemical, and photovoltaic properties of PBDT–DFBSe are compared with those of its non‐fluorinated analog, PBDT–BSe, which is composed of BDT and 2,1,3‐benzoselenadiazole (BSe). The optical bandgap energies of PBDT–BSe and PBDT–DFBSe are determined from their absorption onsets to be 1.64 and 1.60 eV, respectively. Fluorine‐containing PBDT–DFBSe shows a deeper highest occupied molecular orbital (HOMO) energy level and higher hole mobility than PBDT–BSe. The device incorporating PBDT–DFBSe has a higher open‐circuit voltage ( V oc ), short‐circuit current density ( J sc ), and power conversion efficiency (PCE) than the device incorporating PBDT–BSe.