This article is cited in 4 papers

CONDENSED MATTER

Charge accumulation layer on the n-GaN (0001) surface with ultrathin Ba coatings

G. V. Benemanskaya, G. É. Frank-Kamenetskaya

Ioffe Physico-Technical Institute, Russian Academy of Sciences

Abstract: The adsorption of Ba on the n-type GaN(0001) surface is studied. It is found that submonolayer Ba coatings induce cardinal changes in the electronic properties of the surface with the formation of a charge accumulation layer in the region of the near-surface band bending. The excitation of the Ba/n-GaN system by light from the region of GaN transparency results in photoemission. The lowest value of the work function corresponds to ∼1.90 eV at a Ba coverage of ∼0.4 ML. Two surface bands induced by Ba adsorption are found in the surface photoemission spectra.

PACS: 73.20.-r, 79.60.Dp

Received: 16.03.2005
Revised: 21.04.2005

 English version: Journal of Experimental and Theoretical Physics Letters, 2005, 81:10, 519–522

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