Rights statement: © 2014 AIP Publishing LLC
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Research output: Contribution to Journal/Magazine › Journal article
Research output: Contribution to Journal/Magazine › Journal article
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TY - JOUR
T1 - Hydrogenation of GaSb/GaAs quantum rings
AU - Hodgson, Peter
AU - Hayne, Manus
AU - Ahmad Kamarudin, Mazliana
AU - Zhuang, Qiandong
AU - Birindelli, Simone
AU - Capizzi, Mario
N1 - © 2014 AIP Publishing LLC
PY - 2014/8/28
Y1 - 2014/8/28
N2 - We present the results of photoluminescence measurements on hydrogenated type-II GaSb/GaAs quantum dot/ring (QD/QR) samples at temperatures ranging from 4.2K to 400 K. Hydrogenation is found to suppress optically induced charge depletion (associated with the presence of carbon acceptors in this system). A redshift of the QD\QR emission energy of a few tens of meV is observed at temperatures 300 K, consistent with a reduction in average occupancy by 1 hole. These effects are accompanied by a reduction in PL intensity post-hydrogenation. We conclude that although hydrogenation may have neutralized the carbon acceptors, multiple hole occupancy of type-II GaSb/GaAs QD/QRs is very likely a precondition for intense emission, which would make extending the wavelength significantly beyond 1300 nm at room temperature difficult.
AB - We present the results of photoluminescence measurements on hydrogenated type-II GaSb/GaAs quantum dot/ring (QD/QR) samples at temperatures ranging from 4.2K to 400 K. Hydrogenation is found to suppress optically induced charge depletion (associated with the presence of carbon acceptors in this system). A redshift of the QD\QR emission energy of a few tens of meV is observed at temperatures 300 K, consistent with a reduction in average occupancy by 1 hole. These effects are accompanied by a reduction in PL intensity post-hydrogenation. We conclude that although hydrogenation may have neutralized the carbon acceptors, multiple hole occupancy of type-II GaSb/GaAs QD/QRs is very likely a precondition for intense emission, which would make extending the wavelength significantly beyond 1300 nm at room temperature difficult.
KW - Quantum Rings
KW - Hydrogenation
KW - GaSb
U2 - 10.1063/1.4894413
DO - 10.1063/1.4894413
M3 - Journal article
VL - 105
JO - Applied Physics Letters
JF - Applied Physics Letters
SN - 0003-6951
M1 - 081907
ER -