Lloyd-Hughes, J.; Merchant, S. K. E.; Lan, F.; Tan, H. H.; Jagadish, C.; Castro-Camus, E.; Johnston, M. B.
The carrier dynamics of photoexcited electrons in the vicinity of the surface
of (NH₄)₂S-passivated GaAs were studied via terahertz (THz) emission
spectroscopy and optical-pump THz-probe spectroscopy. THz emission spectroscopy
measurements, coupled with Monte Carlo simulations of THz emission, revealed
that the surface electric field of GaAs reverses after passivation. The
conductivity of photoexcited electrons was determined via optical-pump
THz-probe spectroscopy, and was found to...[Show more]
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