Titanium dioxide thin films as vacuum ultraviolet photoconductive detectors with enhanced photoconductivity by gamma-ray irradiation

0552194 - FZÚ 2022 RIV CH eng J - Článek v odborném periodiku
Cadatal-Raduban, M. - Yamanoi, K. - Olejníček, Jiří - Kohout, Michal - Kato, S. - Horiuchi, Y. - Kato, T. - Haoze, Y. - Sarukura, N. - Ono, S.
Titanium dioxide thin films as vacuum ultraviolet photoconductive detectors with enhanced photoconductivity by gamma-ray irradiation.
Thin Solid Films. Roč. 726, May (2021), č. článku 138637. ISSN 0040-6090. E-ISSN 1879-2731
Grant CEP: GA MŠMT(CZ) EF16_019/0000760
Grant ostatní: OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institucionální podpora: RVO:68378271
Klíčová slova: titanium dioxide * thin film * vacuum ultraviolet * photoconductive detector * gamma-ray irradiation * radiation-hardness
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 2.358, rok: 2021
Způsob publikování: Omezený přístup
https://doi.org/10.1016/j.tsf.2021.138637

We show that titanium dioxide (TiO2) thin films can be used as photoconductive detectors of vacuum ultraviolet (VUV) radiation, with further improvement in performance after recovery from gamma ray irradiation. An initial decrease in photocurrent was observed after irradiation with 3.4 kilo gray gamma rays as oxygen vacancies and trivalent titanium ion states are formed as confirmed by optical and photoluminescence spectroscopies showing a red-shift in the transmission edge, narrowing of the optical band gap, and appearance of a broad absorption band in the 392-528 nm wavelength range. Subsequent recovery of these defects increased the photoconductivity beyond what was displayed by the pristine detector. After recovering, the photosensitivity of the detector increased by a factor of about 8 and 124 compared to its photosensitivity before and immediately after irradiation, respectively.
Trvalý link: http://hdl.handle.net/11104/0327389