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Published on: September 12, 2014
Photon upconversion in degenerately sulfur doped InP nanowires
K Mergenthaler1, S Lehmann1, J Wallentin2
1Department of Solid State Physics/The Nanaometer Structure Consortium, Lund University, Box 118, 221 00 Lund, Sweden. kilian.mergenthaler@ftf.lth.se.
Abstract:
Radiative recombination in degenerately n-doped InP nanowires is studied for excitation above and below the Fermi energy of the electron gas, using photoluminescence. Laser-induced electron heating is observed, which allows absorption below the Fermi energy. We observe photon upconversion where photo-excited holes recombine with high |k| electrons. This can be attributed to hole scattering to high |k|-values, and the temperature dependence of this process is measured. We show that hole relaxation via phonon scattering can be observed in continuous wave excitation luminescence measurements.
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