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Holmium hafnate : an emerging electronic device material

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Scott_2015_APL_HolmiumHafnate_FinalPubVersion.pdf (1.358Mb)
Date
16/03/2015
Author
Pavunny, Shojan P.
Sharma, Yogesh
Kooriyattil, Sudheendran
Dugu, Sita
Katiyar, Rajesh K.
Scott, James F.
Katiyar, Ram S.
Keywords
Pyrochlores
QC Physics
NDAS
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Abstract
We report structural, optical, charge transport, and temperature properties as well as the frequency dependence of the dielectric constant of Ho2Hf2O7 (HHO) which make this material desirable as an alternative high-k dielectric for future silicon technology devices. A high dielectric constant of similar to 20 and very low dielectric loss of similar to 0.1% are temperature and voltage independent at 100 kHz near ambient conditions. The Pt/HHO/Pt capacitor exhibits exceptionally low Schottky emission-based leakage currents. In combination with the large observed bandgap Eg of 5.6 eV, determined by diffuse reflectance spectroscopy, our results reveal fundamental physics and materials science of the HHO metal oxide and its potential application as a high-k dielectric for the next generation of complementary metal-oxide-semiconductor devices.
Citation
Pavunny , S P , Sharma , Y , Kooriyattil , S , Dugu , S , Katiyar , R K , Scott , J F & Katiyar , R S 2015 , ' Holmium hafnate : an emerging electronic device material ' , Applied Physics Letters , vol. 106 , no. 11 , 112902 . https://doi.org/10.1063/1.4915503
Publication
Applied Physics Letters
Status
Peer reviewed
DOI
https://doi.org/10.1063/1.4915503
ISSN
0003-6951
Type
Journal article
Rights
© 2015 AIP Publishing LLC. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at: https://dx.doi.org/10.1063/1.4915503
Description
Financial support from DOE Grant No. DE-FG02-08ER46526 is acknowledged. S.P.P. is grateful to NSF for financial assistance under Grant No. NSF-EFRI RESTOR #1038272. Y.S. is thankful to IFN-NSF for doctoral fellowship under NSF-RII-0701525 grant.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/8815

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