Enhanced Mobility in InAlN/AlN/GaN HEMTs Using a GaN Interlayer
Artikel i vetenskaplig tidskrift, 2019

© 1963-2012 IEEE. An enhancement of the electron mobility ( \mu ) in InAlN/AlN/GaN heterostructures is demonstrated by the incorporation of a thin GaN interlayer (IL) between the InAlN and AlN. The introduction of a GaN IL increases \mu at room temperature (RT) from 1600 to 1930 cm2/Vs. The effect is further enhanced at cryogenic temperature (5 K), where the GaN IL sample exhibits a \mu of 16000 cm2/Vs, compared to 6900 cm2/Vs without IL. The results indicate the reduction of one or more scattering mechanisms normally present in InAlN/AlN/GaN heterostructures. We propose that the improvement in \mu is either due to the suppression of fluctuations in the quantum well subband energies or to reduced Coulomb scattering, both related to compositional variations in the InAlN. HEMTs fabricated on the GaN IL sample demonstrate larger improvement in dc-and high-frequency performance at 5 K; {f}-{\text {max}} increases by 25 GHz to 153 GHz, compared to an increase of 6 GHz to 133 GHz without IL. The difference in improvement was associated mainly with the drop in the access resistances.

mobility

interlayer (IL)

InAlN

HEMT

GaN

Cryogenic temperature

Författare

Anna Malmros

SweGaN AB

Chalmers, Mikroteknologi och nanovetenskap (MC2), Mikrovågselektronik, Mikrovågselektronik

J. T. Chen

Linköpings universitet

Hans Hjelmgren

Linköpings universitet

Jun Lu

Linköpings universitet

L. Hultman

Linköpings universitet

O. Kordina

Linköpings universitet

E. O. Sveinbjornsson

Háskóli Íslands

Herbert Zirath

Chalmers, Mikroteknologi och nanovetenskap (MC2), Mikrovågselektronik

Niklas Rorsman

Chalmers, Mikroteknologi och nanovetenskap (MC2), Mikrovågselektronik, Mikrovågselektronik

IEEE Transactions on Electron Devices

0018-9383 (ISSN)

Vol. 66 7 2910-2915 8731885

Ämneskategorier

Materialkemi

Annan fysik

Den kondenserade materiens fysik

DOI

10.1109/TED.2019.2914674

Mer information

Senast uppdaterat

2019-07-02