Effect of the surface states on photoluminescence from surface quantum wells
Institute of Physics, National Academy of Sciences of Ukraine - Kiev, 03028, Ukraine
2 U. S. Army Aviation and Missile RDEC - Redstone Arsenal, AL 35898, USA
3 Department of Physics, Jackson State University - Jackson, MS 39217, USA
4 Department of Physics, Duke University - Durham, NC 27708, USA
5 Nitronex Corporation - Raleigh, NC 27703, USA
Corresponding author: firstname.lastname@example.org
We report on photoluminescence (PL) measurements at 85 K for surface quantum wells (SQWs) with a width in the range of 1.51–2.9 nm. The PL spectra show a redshift with decreasing SQW width, in contrast to the blueshift normally observed for conventional GaN QWs of the same width. The effect is attributed to a strong coupling of SQW confined exciton states with surface acceptors. The PL hence originates from the recombination of surface-acceptor-bound () excitons. Two types of acceptors were identified.
PACS: 78.55.-m – Photoluminescence, properties and materials
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