Kim, Youngsoo Yoo, Beom Jin Vittal, R. Lee, Yeonhee Park, Nam-Gyu Kim, Kang-Jin 2024-01-21T00:01:43Z 2024-01-21T00:01:43Z 2021-09-03 2008-01-10 0378-7753 https://pubs.kist.re.kr/handle/201004/133822 The effects of low-temperature O-2 plasma treatment of a TiO2 film are studied with the objective of improving the performance of dye-sensitized solar cells (DSSCs). X-ray photoelectron spectra (XPS) reveal that the ratio of titanium dioxide to titanium sub-oxides is increased in the O-2 plasma-treated TiO2 film, compared with that of the untreated TiO2 film. This increase suggests that the oxygen vacancies in the film are effectively reduced. The near-edge X-ray absorption fine structure (NEXAFS) spectra results agree with the XPS result. It is proposed that there is a correlation between the shifts of the peaks in the NEXAFS spectra and the adsorption of N719 dye on the TiO2 particles. A DSSC having an O-2 plasma-treated, 4 mu m thick TiO2 film electrode renders a short-circuit photocurrent of 7.59 mA cm(-2), compared with 6.53 mA cm(-2) for a reference cell with an untreated TiO2 electrode of the same thickness. As a result of these changes, the solar-to-electricity conversion efficiency of the O-2 plasma-treated cell is found to be 4.0% as compared with 3.5% for the untreated cell. This improvement in the performance is rationalized on the basis of increased N719 dye adsorption on to the TiO2, due to the reduction in the number of oxygen vacancies caused by the oxygen plasma treatment. (C) 2007 Elsevier B.V. All rights reserved. English ELSEVIER INTRINSIC DEFECTS SURFACE ELECTRODES ABSORPTION ADSORPTION TIO2(110) TRANSPORT PHOTOCURRENT MORPHOLOGY NEXAFS Low-temperature oxygen plasma treatment of TiO2 film for enhanced performance of dye-sensitized solar cells Article 10.1016/j.jpowsour.2007.09.112 1 JOURNAL OF POWER SOURCES, v.175, no.2, pp.914 - 919 JOURNAL OF POWER SOURCES 175 2 914 919 scie scopus 000252634300029 2-s2.0-36749014064 Chemistry, Physical Electrochemistry Energy & Fuels Materials Science, Multidisciplinary Chemistry Electrochemistry Energy & Fuels Materials Science Article INTRINSIC DEFECTS SURFACE ELECTRODES ABSORPTION ADSORPTION TIO2(110) TRANSPORT PHOTOCURRENT MORPHOLOGY NEXAFS oxygen plasma oxygen vacancy dye-sensitized TiO2 solar cell short-circuit photocurrent conversion efficiency