Advances in nano research

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Synthesis and optical properties of ZnO thin films prepared by SILAR method with ethylene glycol

  • Lee, Pay-Yu (Institute of Microelectronics and Department of Electrical Engineering, National Cheng Kung University) ;
  • Chang, Sheng-Po (Institute of Microelectronics and Department of Electrical Engineering, National Cheng Kung University) ;
  • Chang, Shoou-Jinn (Institute of Microelectronics and Department of Electrical Engineering, National Cheng Kung University)
  • Received : 2013.03.03
  • Accepted : 2013.07.15
  • Published : 2013.06.25
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Abstract

An ultrasonic-mediated assisted stepwise method has been developed for depositing transparent ZnO films from aqueous solution. Rinsing in low ethylene glycol temperature was easy to produce intermediate phase of $Zn(OH)_2$, rinsing in $120^{\circ}C$ ethylene glycol was observed the diffraction peak of intermediate $Zn(OH)_2$ in early report, the rinsing temperature plays an important role in the process of $Zn(OH)_2$ phase transformed to ZnO, high rinsing temperature actually improved the intermediate phase. However, the effect of rinsing on the intermediate phase is yet to be understood clearly. The effect of different rinsing procedures, involving either of or a combination of successive ionic layer adsorption and reaction (SILAR) and ultrasonic-assisted rinsing, prior to hydrolysis in ethylene glycol was found to improve the occurrence $Zn(OH)_2$ in ZnO thin films. In the zinc complex ($[Zn(NH_3)_4]^{2+}$) solution, excess ($[Zn(NH_3)_4]^{2+}$) absorbed in glass substrate transformed incompletely to ZnO and exist as $Zn(OH)_2$ phase in thin films. In films deposited at low temperature, rinsing procedure is applied to improve excess $Zn(OH)_2$ and obtain smoother transparent thin films.

Keywords

References

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