S K E Merchant et al 2008 Nanotechnology 19 395704 doi:10.1088/0957-4484/19/39/395704
S K E Merchant1, J Lloyd-Hughes1,3, L Sirbu2, I M Tiginyanu2, P Parkinson1, L M Herz1 and M B Johnston1
Show affiliationsWe have investigated the terahertz conductivity of extrinsic and photoexcited electrons in nanoporous indium phosphide (InP) at different pore densities and orientations. The form of electronic transport in the film was found to differ significantly from that for bulk InP. While photo-generated electrons showed Drude-like transport, the behaviour for extrinsic electrons deviated significantly from the Drude model. Time-resolved photoconductivity measurements found that carrier recombination was slow, with lifetimes exceeding 1 ns for all porosities and orientations. When considered together, these findings suggest that the surfaces created by the nanopores strongly alter the dynamics of both extrinsic and photoexcited electrons.
73.63.-b Electronic transport in nanoscale materials and structures
61.43.Gt Powders, porous materials
73.50.Gr Charge carriers: generation, recombination, lifetime, trapping, mean free paths
78.70.Gq Microwave and radio-frequency interactions
Condensed matter: electrical, magnetic and optical
Surfaces, interfaces and thin films
Issue 39 (1 October 2008)
Received 12 May 2008, in final form 7 July 2008
Published 11 August 2008
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