期刊
SYNTHETIC METALS
卷 160, 期 23-24, 页码 2618-2622出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2010.10.013
关键词
Polymer; Photovoltaic cells; Thiophene; 2H-benzimidazole
资金
- Korea government (MEST) [2010-0015069, 2007-0056301]
- Korea Ministry of Knowledge Economy (MKE) [2008-N-PV08-P-01]
- National Research Foundation of Korea [2007-0056301] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A series of new semiconducting polymers with 3-(hexyloxy)thiophene, 2,2-dihexyl-2H-benzimidazole (HBI) and thiophene units was synthesized using Stille polymerization. These random copolymers show good solubility at room temperature in organic solvents owing to the long alkyl chain in new acceptor, 2,2-dihexyl-2H-benzimidazole. In HBI, the sulfur at 2-position of 2,1,3-benzothiadiazole (BT) unit was replaced with the carbon to make a highly soluble electron deficient moiety while keeping the 1,2-quinoid form of BT unit. The spectra of the solid films show absorption bands with maximum peaks at about 408-526 nm and the absorption onsets at 550-692 nm, corresponding to band gaps of 1.79-2.25 eV. The onset wavelengths of the absorption spectra in thin films exhibit a gradual red-shift with decreased amount of dihexyl-2H-benzimidazol unit, that is, from 550 nm with PHOTDTHBI-9 to 692 nm with PHOTDTHBI-1. Under white light illumination (AM 1.5G. 100 mW/cm(2)), the device with PHOTDTHBI-3:PCBM blend demonstrated a V-OC value of 0.36 V. a J(SC) value of 1.20 mA/cm(2), and a FF of 0.37, leading to the efficiency of 0.16%. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved.
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