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Atomic-layer Deposition for Improved Performance of III-N Avalanche Photodiodes

Published online by Cambridge University Press:  17 February 2014

John Hennessy ,
L. Douglas Bell ,
Shouleh Nikzad ,
Puneet Suvarna ,
Jeffrey M. Leathersich ,
Jonathan Marini  and
F. (Shadi) Shahedipour-Sandvik
John Hennessy
Affiliation:
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA
L. Douglas Bell
Affiliation:
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA
Shouleh Nikzad
Affiliation:
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA
Puneet Suvarna
Affiliation:
College of Nanoscale Science and Engineering, State University of New York, Albany, NY
Jeffrey M. Leathersich
Affiliation:
College of Nanoscale Science and Engineering, State University of New York, Albany, NY
Jonathan Marini
Affiliation:
College of Nanoscale Science and Engineering, State University of New York, Albany, NY
F. (Shadi) Shahedipour-Sandvik
Affiliation:
College of Nanoscale Science and Engineering, State University of New York, Albany, NY
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Abstract

We have investigated surface modification methods for avalanche photodiodes using dielectrics deposited by atomic layer deposition (ALD). Arrays of mesa GaN APDs were fabricated, and ALD Al2O3 was used for sidewall passivation prior to completing the APD array. The use of ALD Al2O3 in this manner was observed to result in a large average improvement in APD dark current when compared with devices using more conventional SiO2 passivation layers produced by chemical vapor deposition. Co-processed metal-oxide-semiconductor (MOS) capacitors fabricated with the same passivation layers show significant improvement in electrical interface quality for devices with ALD Al2O3.

Keywords

semiconductingatomic layer depositionoxide
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1635: Symposium T – Compound Semiconductor Materials and Devices , 2014 , pp. 23 - 28
Copyright
Copyright © Materials Research Society 2014 

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References

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