Impact of proton irradiation on photoluminescent properties of C-doped ZrO2 films prepared by ALD

Sytchkova, Anna; Protopapa, Maria Lucia; Kolev, Hristo; Burresi, Emiliano; Olivero, Paolo; Dunatov, Toni; Siketić, Zdravko; Tapfer, Leander; Wang, Zhihao; He, Hongbo; Wang, Yanzhi (2024) Impact of proton irradiation on photoluminescent properties of C-doped ZrO2 films prepared by ALD. Vacuum, 224 . ISSN 0042-207X

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Abstract

Amorphous C-doped zirconia thin films grown by ALD technique on fused silica substrates have high transmittance and significant photoluminescence (PL) capacity suitable for application as a transparent material to convert high energy into lower energy photons as well as an optical sensor of radiation. Due to carbon doping, zirconia films present three main PL transitions: Transition I and II at lambda em = 450 nm (lambda exc = 200 and 270 nm), related to sp3 and sp2 C-C bonds, and Transition III at lambda em = 450 nm (lambda exc = 300 nm) that can be assigned to C--O bonds which introduce n levels in the 7c- 7c* gap. Protons with energy of 100 keV and two values of fluence (1 center dot 1012 p+/cm2 and 5 center dot 1014 p+/cm2) were used to modify the film properties. The changes induced by the radiation in the chemical composition of the films have been monitored as a function of irradiation dose using indepth resolved XPS analysis which evidenced modification of C-Zr, Zr-O, C-H, C-C/C--C and C--O bonds. We demonstrate that C-Zr bonds formed in the film depth are cleaved by protonation in favor of Zr-O, C-H and C--O bonds establishment. As a consequence, more defect levels are formed in the 7c- 7c* gap of carbon. Consequently, the emission due to Transitions III becomes more intense for high energy doses, getting intensity values close to Transitions I/II.

Item Type:	Article
Uncontrolled Keywords:	optical coatings ; space radiation ; photoluminescence ; oxide
Subjects:	NATURAL SCIENCES > Physics
Divisions:	Division of Experimental Physics
Depositing User:	Zdravko Siketić
Date Deposited:	17 Apr 2025 08:43
URI:	http://fulir.irb.hr/id/eprint/9700
DOI:	10.1016/j.vacuum.2024.113083

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