Lee, Sun Hong Chae, Sang Youn Hwang, Yun Jeong Koo, Kee-Kahb Joo, Oh-Shim 2024-01-20T11:33:39Z 2024-01-20T11:33:39Z 2021-09-05 2013-09 0947-8396 https://pubs.kist.re.kr/handle/201004/127715 Dye-sensitized solar cells (DSSCs) were fabricated using TiO2 nanoparticles (NPs), TiO2 nanotube arrays (NTAs), and surface-modified NTAs with a TiCl4 treatment. The photovoltaic efficiencies of the DSSCs using TiO2 NP, NTA, and TiCl4-treated NTA electrodes are 4.25, 4.74, and 7.47 %, respectively. The highest performance was observed with a TiCl4-treated TiO2 NTA photoanode, although in the case of the latter two electrodes, the amounts of N719 dye adsorbed were similar and 68 % of that of the NP electrode. Electrochemical impedance measurements show that the overall resistance, including the charge-transfer resistance, was smaller with NTA morphologies than with NP morphologies. We suggest that a different electron transfer mechanism along the one-dimensional nanostructure of the TiO2 NTAs contributes to the smaller charge-transfer resistance, resulting in a higher short circuit current (J (sc)), even at lower dye adsorption. Furthermore, the TiCl4-treated NTAs showed even smaller charge-transfer resistance, resulting in the highest J (sc) value, because the downward shift in the conduction band edge improves the electron injection efficiency from the excited dye into the TiCl4-treated TiO2 electrodes. English SPRINGER NANOPOROUS TIO2 RECOMBINATION ELECTRODES FILMS PHOTOCARRIERS REPLACEMENT TITANIA CO Influence of TiO2 nanotube morphology and TiCl4 treatment on the charge transfer in dye-sensitized solar cells Article 10.1007/s00339-013-7786-0 1 APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, v.112, no.3, pp.733 - 737 APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING 112 3 733 737 scie scopus 000322669000028 2-s2.0-84881308397 Materials Science, Multidisciplinary Physics, Applied Materials Science Physics Article NANOPOROUS TIO2 RECOMBINATION ELECTRODES FILMS PHOTOCARRIERS REPLACEMENT TITANIA CO