Enhancing Optical and Electrical Properties of La- and Al-Codoped ZnO Thin Films Prepared by Sol-Gel Method -La Codoping Effect

Author(s): Hai -Yan He*.

Journal Name: Recent Patents on Nanotechnology

Volume 11 , Issue 2 , 2017

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Graphical Abstract:


Backgroud: The transparent conductive ZnO film is widely used in solar cell. Enhancing the transmittance and electrical conductivity of the films is attracting many attentions to improve cell efficiency.

Methods: This work focuses on the fabrication and potential application of the various cation-doped ZnO materials in recent patents and literature and then presents the La codoping effects of Al-doped ZnO films. Films were deposited by a sol-gel route and characterized by various techniques including X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, UV-vis and luminescent spectroscopies, and electrical conduction analysis.

Results: The UV-vis. transmittance and band gap increased and then decreased, whereas the resistivity decreased and then slightly increased with the increase in La/Al ratio. The La/Al ratio of 0.0105 led to a maximal transmittance, a widest band gap, and a minimal resistivity. The films also illustrated a near band gap emission and some intrinsic defect-related emissions with varied intensity with La/Al ratio.

Conclusion: This work reveal that the electrical and optical properties of the ZnO:Al films can be well enhanced by La codoping. This is significant to the applications of the ZnO:Al materials.

Keywords: Codoping effect, microstructure, optical properties, semiconductors, sol-gel chemistry, thin films, ZnO.

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Article Details

Year: 2017
Page: [146 - 153]
Pages: 8
DOI: 10.2174/1872210510666160929115302
Price: $58

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PDF: 10