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Influence of the anatase/rutile phase ratio on the photoresponse of TiO2 thin films.

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Title: Influence of the anatase/rutile phase ratio on the photoresponse of TiO2 thin films.
Authors: Perillo, P. M.1 (AUTHOR) pato.dulce@gmail.com, Rodriguez, D. F.1 (AUTHOR)
Source: Journal of Solid State Electrochemistry. Mar2026, Vol. 30 Issue 3, p1233-1241. 9p.
Subjects: Titanium dioxide films, Photosensitivity, Anodic oxidation of metals, Titanium dioxide, Optical properties
Abstract: In this work, TiO₂ thin films were fabricated on a gold-interdigitated silicon substrate by electrochemical anodization. The samples were annealed in air for 6 h at 450 °C and 550 °C, obtaining the coexistence of the anatase and rutile phases. The influence of the anatase/rutile phases ratio on the photoresponse at different wavelengths was analyzed. The optical and electrical properties, as well as the morphology of the TiO₂ thin film, were studied by scanning electron microscopy, X-ray diffraction, impedance spectroscopy, and UV–vis spectroscopy. Unlike most TiO₂ films, which exhibit good photoresponse only in UV light, we were able to extend the photoresponse to a wide range of wavelengths. Controlling the ratio of the anatase/rutile phases by annealing temperature significantly improved the sensitivity of the thin film. It was observed that the sample with approximately 80% anatase phase by weight exhibited a better photoresponse than the sample with a reduced anatase value of 25%. In particular, sensitivity increased by an order of magnitude. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:In this work, TiO₂ thin films were fabricated on a gold-interdigitated silicon substrate by electrochemical anodization. The samples were annealed in air for 6 h at 450 °C and 550 °C, obtaining the coexistence of the anatase and rutile phases. The influence of the anatase/rutile phases ratio on the photoresponse at different wavelengths was analyzed. The optical and electrical properties, as well as the morphology of the TiO₂ thin film, were studied by scanning electron microscopy, X-ray diffraction, impedance spectroscopy, and UV–vis spectroscopy. Unlike most TiO₂ films, which exhibit good photoresponse only in UV light, we were able to extend the photoresponse to a wide range of wavelengths. Controlling the ratio of the anatase/rutile phases by annealing temperature significantly improved the sensitivity of the thin film. It was observed that the sample with approximately 80% anatase phase by weight exhibited a better photoresponse than the sample with a reduced anatase value of 25%. In particular, sensitivity increased by an order of magnitude. [ABSTRACT FROM AUTHOR]
ISSN:14328488
DOI:10.1007/s10008-025-06466-z