Journal
SYNTHETIC METALS
Volume 162, Issue 13-14, Pages 1184-1189Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2012.05.004
Keywords
Bulk heterojunction solar cells; Copolymers; Fluorene; Indenofluorene; Thiadiazoloquinoxaline
Funding
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) [20103020010050]
- Ministry of Knowledge Economy, Republic of Korea
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Two new alternating copolymers comprising 4,6,7,9-tetra(thiophen-2-yl)-[1,2,5]thiadiazolo[3,4-giquinoxaline and 6,6',12,12'-tetraoctyl-6,12-dihyroindeno[1,2-b]fluorene (PIFDQ) or 9,9-dioctyl-9H-fluorene (PFDQ) were synthesized via Suzuki polymerization reaction. The optical and electrochemical properties of polymers PIFDQ and PFDQ were found to be quite similar, and their absorption bands were extended from 250 nm to 1100 nm in film. The optical band gaps of the polymers were calculated from the onset wavelength of absorption to be 1.19 eV and 1.16 eV, respectively. The energy conversion ability of the synthesized polymers was tested by making single layer BHJ solar cells with the configuration of ITO/PEDOT:PSS/PIFDQ or PFDQ:PC70BM (1:5, wt%)/TiOx/Al. The overall photovoltaic performance of the device based on PIFDQ was found to be 0.27% with a V-oc of 0.41 V. a J(sc) of 2.39 mA/cm(2), and a FF of 28%, while the device made from PFDQ showed power conversion efficiency (PCE) of 0.16% with a V-oc of 0.43 V. a J(sc) of 1.30 mA/cm(2), and a FF of 28%. (C) 2012 Elsevier B.V. All rights reserved.
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