期刊
COMPTES RENDUS CHIMIE
卷 16, 期 2, 页码 195-200出版社
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.crci.2012.10.015
关键词
Dye-sensitized solar cells; Polymer electrolyte; Plastic salt; Electron recombination
资金
- National Natural Science Foundation of China [11004113, 11074135]
- Natural Science Foundation of Zhejiang [Y4090429]
- Technology Innovative Research Team of Zhejiang Province [2009R50010]
- K.C. Wong Magna Fund in Ningbo University
Ionic conductivity and the type of ions are important for the composite polymer electrolyte (CPE) of the dye-sensitized solar cells (DSSCs). Lithium bis(trifluoromethane sulphone)imide (LiTFSI for short) which is easy to dissociate, is added in the composite polymer electrolyte(CPE) as a plasticizer. The LiTFSI acts differently from the conventional LiClO4. LiTFSI changes the conformation of the polymer chain and shows higher ionic conductivity than LiClO4. That contributes to the improvement of the short current density of the DSSC. Furthermore, the DSSCs with LiTFSI modification show higher photovoltage than the LiClO4. The anions of TFSI- prohibit the interface recombination more effectively compared with the LiClO4 as the electrochemical impedance spectroscopy indicated. With the LiTFSI modified electrolyte, the performances of the DSSCs under 1 Sun, AM1.5 are improved and reaches the highest of 4.82% at the LiTFSI:LiI = 0.116:1, much better than the original DSSC(3.6%) and the LiClO4 modified CPE electrolyte DSSC(4.32%). (C) 2012 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.
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