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Long-term Room Temperature Instability in Thermal Conductivity of InGaZnO Thin Films

Published online by Cambridge University Press:  22 February 2016

Boya Cui ,
D. Bruce Buchholz ,
Li Zeng ,
Michael Bedzyk ,
Robert P. H. Chang  and
Matthew Grayson
Boya Cui
Affiliation:
Applied Physics Program, Northwestern University, Evanston, IL 60208, U.S.A Electrical Engineering and Computer Science, Northwestern University, Evanston, IL 60208, U.S.A
D. Bruce Buchholz
Affiliation:
Material Science and Engineering, Northwestern University, Evanston, IL 60208, U.S.A
Li Zeng
Affiliation:
Applied Physics Program, Northwestern University, Evanston, IL 60208, U.S.A
Michael Bedzyk
Affiliation:
Applied Physics Program, Northwestern University, Evanston, IL 60208, U.S.A Material Science and Engineering, Northwestern University, Evanston, IL 60208, U.S.A
Robert P. H. Chang
Affiliation:
Applied Physics Program, Northwestern University, Evanston, IL 60208, U.S.A Material Science and Engineering, Northwestern University, Evanston, IL 60208, U.S.A
Matthew Grayson*
Affiliation:
Applied Physics Program, Northwestern University, Evanston, IL 60208, U.S.A Electrical Engineering and Computer Science, Northwestern University, Evanston, IL 60208, U.S.A
*
*(Email: mgrayson@eecs.northwestern.edu)
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Abstract

The cross-plane thermal conductivities of InGaZnO (IGZO) thin films in different morphologies were measured on three occasions within 19 months, using the 3ω method at room temperature 300 K. Amorphous (a-), semi-crystalline (semi-c-) and crystalline (c-) IGZO films were grown by pulsed laser deposition (PLD), followed by X-ray diffraction (XRD) for evaluation of film quality and crystallinity. Semi-c-IGZO shows the highest thermal conductivity, even higher than the most ordered crystal-like phase. After being stored in dry low-oxygen environment for months, a drastic decrease of semi-c-IGZO thermal conductivity was observed, while the thermal conductivity slightly reduced in c-IGZO and remained unchanged in a-IGZO. This change in thermal conductivity with storage time can be attributed to film structural relaxation and vacancy diffusion to grain boundaries.

Keywords

thermal conductivitythin filmtransparent conductor
Type
Articles
Information
MRS Advances , Volume 1 , Issue 22: Electronics and Photonics , 2016 , pp. 1631 - 1636
Copyright
Copyright © Materials Research Society 2016 

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References

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