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TiO2 surface engineering with multifunctional oligomeric polystyrene coadsorbent for dye-sensitized solar cells

Title
TiO2 surface engineering with multifunctional oligomeric polystyrene coadsorbent for dye-sensitized solar cells
Author
강용수
Keywords
HIGHLY EFFICIENT; PERFORMANCE; RECOMBINATION; ELECTROLYTES; PHOTOVOLTAGE; DEPOSITION; TITANIA; FILMS; ACID
Issue Date
2015-08
Publisher
ROYAL SOC CHEMISTRY
Citation
RSC ADVANCES, v. 5, NO 84, Page. 68413-68419
Abstract
Oligomeric, hydrophobic coadsorbents based on polystyrene (o-PS, M-n = 2600) terminated by a carboxylic acid exhibit dual functions in dye-sensitized solar cells (DSCs): suppression of electron recombination at the TiO2 surface, and enhanced concentration of the strongly-anchored dye, N719, which has two carboxylic acid groups. Engineering the TiO2 surface via o-PS results in the concurrent and significant enhancement of photovoltage and photocurrent, consequently increasing the energy conversion efficiency of DSCs by as much as 28.7%. The electron recombination rate was largely reduced via the blockage of vacant sites with o-PS chains on the TiO2 surface due to the physical hindrance to I(3)(-)s in electrolyte. In addition, the formation of the o-PS:I-2 charge transfer complex at the photoanode/electrolyte interface lessened the effective concentrations of free I-3(-) and/or I-2 for electron recombination. Upon sequential o-PS coadsorption, the concentration of the strongly-anchored dyes on the TiO2 surface was increased via deprotonation of the weakly-anchored dyes, giving rise to an increase in the electron injection efficiency and, subsequently, the overall power conversion efficiency. The dual functions of the o-PS coadsorbent have been therefore demonstrated to increase the overall efficiency of DSCs.
URI
http://pubs.rsc.org/en/Content/ArticleLanding/2015/RA/C5RA12889G#!divAbstracthttp://hdl.handle.net/20.500.11754/26948
ISSN
2046-2069
DOI
10.1039/c5ra12889g
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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