Title

Electron irradiation-induced increase of minority carrier diffusion length, mobility, and lifetime in Mg-doped AlN/AlGaN short period superlattice

Authors

Authors

O. Lopatiuk-Tirpak; L. Chernyak; B. A. Borisov; V. V. Kuryatkov; S. A. Nikishin;K. Gartsman

Comments

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Abbreviated Journal Title

Appl. Phys. Lett.

Keywords

GAN; GAAS; Physics, Applied

Abstract

Minority carrier diffusion length in a p-type Mg-doped AlN/Al(0.08)Ga(0.92)N short period superlattice was shown to undergo a multifold and persistent (for at least 1 week) increase under continuous irradiation by low-energy beam of a scanning electron microscope. Since neither the diffusion length itself nor the rate of its increase exhibited any measurable temperature dependence, it is concluded that this phenomenon is attributable to the increase in mobility of minority electrons in the two-dimensional electron gas, which in turn is limited by defect scattering. Cathodoluminescence spectroscopy revealed similar to 40% growth of carrier lifetime under irradiation with an activation energy of 240 meV. (C) 2007 American Institute of Physics.

Journal Title

Applied Physics Letters

Volume

91

Issue/Number

18

Publication Date

1-1-2007

Document Type

Article

Language

English

First Page

3

WOS Identifier

WOS:000250643600046

ISSN

0003-6951

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