Physics – Condensed Matter – Materials Science
Scientific paper
2006-10-20
Physics
Condensed Matter
Materials Science
4 pages, 3 figures, to appear in Applied Physics Letters
Scientific paper
10.1063/1.2398915
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 double after passivation. These experiments demonstrate that passivation significantly reduces the surface state density and surface recombination velocity of GaAs. Finally, we have demonstrated that passivation leads to an enhancement in the power radiated by photoconductive switch THz emitters, thereby showing the important influence of surface chemistry on the performance of ultrafast THz photonic devices.
Castro-Camus E.
Jagadish Chennupati
Johnston M. B.
Lan F.
Lloyd-Hughes James
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