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Dye-sensitized solar cells using ion-gel electrolytes for long-term stability

Title
Dye-sensitized solar cells using ion-gel electrolytes for long-term stability
Author
강용수
Keywords
Dye-sensitized solar cell; Ion-gel; Ionic liquid; Triblock copolymer; Dendron
Issue Date
2012-06
Publisher
Elsevier Science B.V., Amsterdam.
Citation
Journal of power sources,Vol.201 No.- [2012],p395-401
Abstract
Dye-sensitized solar cells (DSSCs) with quasi-solid-ion-gel electrolytes are fabricated using a 1-propyl-3-methyl imidazolium iodide (PMII) with a small amount of poly(styrene-block-ethyleneoxide-block-styrene) (SEOS) triblock copolymer. The interaction between the PMII and SEOS changes the liquid state of PMII into a solid state, and the interactions between the imidazolium cation of PMII and the ethyleneoxide of SEOS are confirmed by an ab initio method. The phase change of the electrolyte from an ionic liquid to a quasi-solid ion-gel in a DSSC slightly increases the photoconversion efficiency, and the DSSC containing an ion-gel maintains 92% of its efficiency under more than 1440 h of operation, which is higher than that with the ionic liquid as an electrolyte (78%) in this system. The addition of dendrons as a barrier-forming co-adsorbent increases the short-circuit current density (J(sc)) of the DSSC. Up to a 27% increase in the power conversion efficiency are achieved with the G5 dendron as the co-adsorbent. EIS and IPCE measurements show that the increase in J(sc) is due to the suppression of recombination by the surface coverage of the TiO2 particles. The photocurrent and the conversion efficiency for all DSSCs prepared with quasi-solid ion-gel electrolytes and dendron co-adsorbents are higher than those prepared with an ionic liquid. (C) 2011 Elsevier B.V. All rights reserved.
URI
http://www.sciencedirect.com/science/article/pii/S0378775311022026?via%3Dihubhttp://hdl.handle.net/20.500.11754/39347
ISSN
0378-7753
DOI
10.1016/j.jpowsour.2011.11.012
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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