Conductivity of nanoporous InP membranes investigated using terahertz spectroscopy

S K E Merchant; J Lloyd-Hughes; L Sirbu; I M Tiginyanu; P Parkinson; L M Herz; M B Johnston

doi:10.1088/0957-4484/19/39/395704

Conductivity of nanoporous InP membranes investigated using terahertz spectroscopy

S K E Merchant, J Lloyd-Hughes, L Sirbu, I M Tiginyanu, P Parkinson, L M Herz, M B Johnston

Research output: Contribution to journal › Article › peer-review

Abstract

We 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.

Original language	English
Journal	Nanotechnology
Volume	19
Issue number	39
DOIs	https://doi.org/10.1088/0957-4484/19/39/395704
Publication status	Published - 11 Aug 2008

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10.1088/0957-4484/19/39/395704

http://www.ncbi.nlm.nih.gov/pubmed/21832605

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title = "Conductivity of nanoporous InP membranes investigated using terahertz spectroscopy",

abstract = "We 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.",

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AU - Merchant, S K E

AU - Lloyd-Hughes, J

AU - Sirbu, L

AU - Tiginyanu, I M

AU - Parkinson, P

AU - Herz, L M

AU - Johnston, M B

PY - 2008/8/11

Y1 - 2008/8/11

N2 - We 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.

AB - We 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.

U2 - 10.1088/0957-4484/19/39/395704

DO - 10.1088/0957-4484/19/39/395704

M3 - Article

SN - 0957-4484

VL - 19

JO - Nanotechnology

JF - Nanotechnology

IS - 39

ER -

Conductivity of nanoporous InP membranes investigated using terahertz spectroscopy

Abstract

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