One of them is zinc oxide, which is a II-VI semiconductor with a direct energy gap of 3.37 eV at room temperature. At present, ZnO has many potential applications as solar cells, piezoelectric transducers, ultraviolet light emitters or gas sensors. We show that zinc oxide is also an appropriate material for 3D applications, because monocrystalline ZnO layers can be obtained at temperature below 300⁰C.

 We present structural, morphological and optical properties of zinc oxide thin films grown by the Atomic Layer Deposition method at the temperature range between 200 ⁰C and 350 ⁰C. ZnO layers were deposited on a gallium nitride substrate using water as an oxygen precursor and diethylzinc or dimethylzinc as a zinc precursor. The obtained ZnO films show bright luminescence of excitonic origin. Defect-related luminescence bands observed in red and green spectral regions are correlated with the composition measured by the EDX analysis. A high resolution X-ray diffraction proves that our zinc oxide films are monocrystalline with FWHM of 00.2 peak equal to230 arcsec.

The work was partially supported by EU within the European Regional Development Found thorough grant Innovative Economy No. POIG.01.01.02-00-008/08.

[1] M. Godlewski et al., Microel.Eng. 85, 2434 (2008)

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