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- Title
Synthesis and Photovoltaic Properties of a New Low-Bandgap Polymer Consisting of Benzodithiophene and Fluorinated Benzoselenadiazole Units.
- Authors
Shin, Seung Ah; Kim, Ji‐Hoon; Park, Jong Baek; Kang, In‐Nam; Park, Moo‐Jin; Hwang, Do‐Hoon
- Abstract
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 ( Voc), short-circuit current density ( Jsc), and power conversion efficiency (PCE) than the device incorporating PBDT-BSe.
- Subjects
BENZOSELENADIAZOLE; BAND gaps; ALTERNATING copolymers; BENZODIAZEPINE receptors; FLUOROPOLYMERS; ALTERNATING copolymerization
- Publication
Macromolecular Chemistry & Physics, 2013, Vol 214, Issue 16, p1780
- ISSN
1022-1352
- Publication type
Article
- DOI
10.1002/macp.201300308