LVM spectroscopy of carbon and carbon-hydrogen pairs in GaAs grown by MOMBE
- 1 May 1991
- journal article
- Published by IOP Publishing in Semiconductor Science and Technology
- Vol. 6 (5) , 330-334
- https://doi.org/10.1088/0268-1242/6/5/003
Abstract
Cryogenic (4.2 K) infrared absorption measurements of GaAs films grown by MOMBE and containing a high concentration of carbon acceptors ( approximately 2*1020 cm-3) show an asymmetric Fano resonance at the frequency of the CAs local mode (582 cm-1). After rapid transient annealing at 950 degrees C for 12 s in an atmosphere of helium and arsine, there is a reduction in the hole concentration, and localized vibrational mode (LVM) spectroscopy reveals the presence of nearest neighbour H-CAs passivated pairs. Previously unreported lines at 452.8 cm-1 and 563.0 cm-1 may be due to the vibrations of the passivated carbon atoms, or possibly CGa donors.Keywords
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