Enhanced photoelectric efficiency by surface modification of TiO2 thin film using various acidic species

Title
Enhanced photoelectric efficiency by surface modification of TiO2 thin film using various acidic species
Author(s)
강미숙정하림[정하림]이예지[이예지]김영미[김영미]
Keywords
SENSITIZED SOLAR-CELLS
Issue Date
201009
Publisher
KOREAN INST CHEM ENGINEERS+
Citation
KOREAN JOURNAL OF CHEMICAL ENGINEERING, v.27, no.5, pp.1462 - 1468
Abstract
This study examined the photoelectric conversion efficiency of the dye-sensitized solar cell (DSSC) when the surface of a nanometer-sized TiO2 film, which was prepared using the solvothermal method, was modified by five acid compounds. The TiO2 film exhibited an anatase structure with an average particle size in the range of 10-15 nm, and the maximum absorption band was shown in the UV-visible spectrum around 360 nm. The surface colors of the carboxylic acid-modified TiO2 films were changed to light or dark with differing energy conversion efficiencies. Particularly, the conversion efficiency was considerably enhanced from approximately 6.25% for the non-modified TiO2 film to approximately 7.50% for the film treated by acetic acid of 1.0 mole, with the N719 dye under 100 mW/cm(2) of simulated sunlight. FT-IR analysis of the films after N719 dye adsorption confirmed that the IR spectrum of the modified TiO2 showed a sharp and strong band at 500 cm(-1), which was assigned to a metal-O bond, due to the formation of a new Ti-O bond between the O of COO- and the Ti atom, which was relatively weaker in the non-modified TiO2. Furthermore, these results were in agreement with an electrostatic force microscopy (EFM) study showing that the electrons were transferred rapidly to the surface of the acetic acid-modified TiO2 film, compared with that on the non-modified TiO2 film.
URI
http://hdl.handle.net/YU.REPOSITORY/23643http://dx.doi.org/10.1007/s11814-010-0252-1
ISSN
0256-1115
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이과대학 > 화학생화학부 > Articles
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