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Optimization of Copper Schottky Contacts on Nanocrystalline ZnO thin films by Atomic Layer Deposition

Published online by Cambridge University Press:  16 May 2016

Mei Shen ,
Triratna P. Muneshwar ,
Ken Cadien ,
Ying Y. Tsui  and
Doug Barlage
Mei Shen*
Affiliation:
Deparment of Electrical and Computer Engineering, University of Alberta, Edmonton, T6G 1H9, Canada
Triratna P. Muneshwar
Affiliation:
Department of Chemical and Material Engineering, University of Alberta, Edmonton, T6G 1H9, Canada
Ken Cadien
Affiliation:
Department of Chemical and Material Engineering, University of Alberta, Edmonton, T6G 1H9, Canada
Ying Y. Tsui
Affiliation:
Deparment of Electrical and Computer Engineering, University of Alberta, Edmonton, T6G 1H9, Canada
Doug Barlage
Affiliation:
Deparment of Electrical and Computer Engineering, University of Alberta, Edmonton, T6G 1H9, Canada
*
*(Email: mshen5@ualberta.ca)
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Abstract

Contact metallization is an essential obstacle for utilizing low temperature achievable polycrystalline ZnO in any discrete devices and integrated circuits. To develop ZnO based semiconductor devices with advanced feature of flexibility, transparency and compatibility with low temperature processing, rectifying junctions must be fully developed. In this work, nanoscale polycrystalline ZnO thin films are fabricated with via low temperature (<200 °C) by atomic layer deposition (ALD). A vertical structure of bottom Schottky metallized diode is developed with copper (Cu) sputtered in room temperature. A control of Cu surface oxidation is realized with an in-situ remote plasma treatment. The results indicate that preparation of the copper surface substantially affects the electrical behavior of the diode. Thermal reliability of Cu metallized Schottky diode is subsequently carried out by annealing up to a maximum temperature of 300 °C before it breaks. This work considers the current transport mechanism evolved deviating current vs voltage (I-V) characteristics from conventional thermionic emission theory.

Keywords

Cuthin filmelectrical properties
Type
Articles
Information
MRS Advances , Volume 1 , Issue 50: Electronics and Photonics , 2016 , pp. 3421 - 3427
Copyright
Copyright © Materials Research Society 2016 

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References

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