Wide bandgap semiconductors have appeared as promising materials suitable for hightemperature,
high-frequency and high power operations in electronic as well as optoelectronic devices
because of their exceptional material characteristics. More specifically, ZnO and CdO films possess an
outstanding ability to materialize short wavelength light emitting devices due to their large band gap
energy. ZnO and CdO nanocrystals are widely used for optoelectronic applications in the shortwavelength
visible-light region especially for laser diodes (LDs) and light emitting diodes (LEDs). In
spite of this, it is challenging to grow high-purity high-quality single crystals since these crystals have
very strong bonding with a nearly equal balance of covalent and ionic bonding. The present review focuses
on the properties and applications of pure and doped ZnO and CdO thick films synthesized by
screen printing techniques with tunable morphology and composition. Screen printing method has
been a novel, simple, quicker and an eco-friendly method for film preparation on large area substrates
with maximum utilization as compared to the other expensive methods. We have outlined currently
employed major techniques for the characterization of pure and doped ZnO and CdO thick films.
Their structural, optical and electrical properties have been studied and we have tried to synchronize
the results with recent works done by several authors in past five years. An interesting correlation
among such properties of these two films has been reported.
Keywords: CdO, electroluminescent, optoelectronic applications, screen printing, thick films, ZnO.
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