Lithuanian Journal of Physics article / Lietuvos fizikos žurnalo straipsnis

[PDF] http://dx.doi.org/10.3952/lithjphys.45609

Open access article / Atviros prieigos straipsnis

Lith. J. Phys. 45, 477–480 (2005)

DRIFT VELOCITY MEASUREMENT AND HOT ELECTRON CAPTURE IN AlGaN / AlN / GaN
O. Kiprijanovič, A. Matulionis, J. Liberis, and L. Ardaravičius
Semiconductor Physics Institute, A. Goštauto 11, LT-01108 Vilnius, Lithuania
E-mail: matulionis@pfi.lt

Received 26 August 2005

Nanosecond technique was used to control the electron density during the electron drift velocity measurement in the absence of channel self-heating. A threshold-type hot electron capture is determined to be reducing the density of mobile electrons: the reduction up to 30% is found in the investigated range of fields below 65 kV/cm at room temperature. No change in electron density is found in the range below 25 kV/cm. The corrected drift velocity data are presented.

Keywords: nitride heterostructures, hot electrons, drift velocity, two-dimensional electron gas, AlGaN / AlN / GaN
PACS: 72.20.-I; 72.20.Ht; 73.21.Fg

KARŠTŲJŲ ELEKTRONŲ PAGAVIMAS IR JŲ DREIFO GREIČIO MATAVIMAS AlGaN / AlN / GaN
O. Kiprijanovič, A. Matulionis, J. Liberis, L. Ardaravičius
Puslaidininkių fizikos institutas, Vilnius, Lietuva

Nanosekundine impulsine technika, leidžiančia išvengti kvantinės protakos kaitimo, buvo matuojamas elektronų dreifo greitis ir elektronų tankio pokytis. Pastebėta, kad dėl karštųjų elektronų pagavimo sumažėja judriųjų elektronų tankis. Sumažėjimas pasiekia net 30% kambario temperatūroje, kai lauko stipris artimas 65 kV/cm. Kai laukai silpnesni už 25 kV/cm, elektronų tankio kitimo nepastebėta. Pateikta pakoreguota, atsižvelgiant į elektronų tankio kitimą, elektronų dreifo greičio priklausomybė nuo elektrinio lauko stiprio.

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