4.7 Article

Spin-Coating and Aerosol Spray Pyrolysis Processed Zn1-xMgxO Films for UV Detector Applications

Journal

NANOMATERIALS
Volume 12, Issue 18, Pages -

Publisher

MDPI
DOI: 10.3390/nano12183209

Keywords

thin ZnMgO films; spin coating; aerosol spray pyrolysis; crystalline phase structure; band gap; photodetector; current-voltage characteristics; injection photodiode

Funding

  1. National Agency for Research and Development of Moldova [20.80009.5007.02, 22.80013.5007.4BL]
  2. European Commission [810652]

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This study explored the morphology, composition, nano-crystalline structure, and optical and vibration properties of Zn1-xMgxO thin films. A device design based on these films as heterostructure photodetectors was proposed and demonstrated in the injection photodiode mode.
A series of Zn1-xMgxO thin films with x ranging from 0 to 0.8 were prepared by spin coating and aerosol spray pyrolysis deposition on Si and quartz substrates. The morphology, composition, nano-crystalline structure, and optical and vibration properties of the prepared films were studied using scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), X-ray diffraction (XRD), and optical and Raman scattering spectroscopy. The optimum conditions of the thermal treatment of samples prepared by spin coating were determined from the point of view of film crystallinity. The content of crystalline phases in films and values of the optical band gap of these phases were determined as a function of the chemical composition. We developed heterostructure photodetectors based on the prepared films and demonstrated their operation in the injection photodiode mode at forward biases. A device design based on two Zn1-xMgxO thin films with different x values was proposed for extending the operational forward bias range and improving its responsivity, detectivity, and selectivity to UV radiation.

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