Defect engineered blue photoluminescence in ZnO:Al/TiO<sub>2</sub> heterostructures
نویسندگان
چکیده
Tailoring the blue photoluminescence (PL) in Al-doped ZnO (AZO)/TiO 2 heterostructures is demonstrated by a controlled induction of shallow defect centers 50 keV Ar + -ions. This established combination temperature dependent PL and electron paramagnetic resonance spectroscopy. The dominant blue-violet an as-grown sample comprises near band-edge emission, along with peak associated radiative recombination electrons donor levels (Zn interstitials) holes from valence band. However, evolution additional yellow-green band at fluence 1 × 10 15 ions/cm governed deep levels, particularly ionized oxygen vacancies. Irradiation 16 further leads to formation Zn vacancies (shallow acceptors) owing development O-rich surface. structural modifications these samples have been investigated field-emission scanning microscopy , transmission microscopy, Rutherford backscattering. While small micro-cracks are found graded layers obtained highest 5 ballistic intermixing diffusion constituents. Detailed investigation suggests that significant amount Ti atoms diffused AZO complete deterioration AZO/TiO matrix fluence.
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ژورنال
عنوان ژورنال: Journal of Applied Physics
سال: 2022
ISSN: ['1089-7550', '0021-8979', '1520-8850']
DOI: https://doi.org/10.1063/5.0096116