Conductivity of nanoporous InP membranes investigated using terahertz spectroscopy

Merchant S. K.E.; Lloyd-Hughes James; Sirbu Lilian; Tiginyanu Ion; Parkinson Patrick; Herz Laura; Johnston Michael

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MERCHANT, S. K.E., LLOYD-HUGHES, James, SIRBU, Lilian, TIGINYANU, Ion, PARKINSON, Patrick, HERZ, Laura, JOHNSTON, Michael. Conductivity of nanoporous InP membranes investigated using terahertz spectroscopy. In: Nanotechnology, 2008, vol. 19, p. 0. ISSN 0957-4484. DOI: https://doi.org/10.1088/0957-4484/19/39/395704

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Nanotechnology

Volumul 19 / 2008 / ISSN 0957-4484

Conductivity of nanoporous InP membranes investigated using terahertz spectroscopy

DOI:https://doi.org/10.1088/0957-4484/19/39/395704

Pag. 0-0

Merchant S. K.E.¹, Lloyd-Hughes James¹², Sirbu Lilian³⁴, Tiginyanu Ion³⁴, Parkinson Patrick¹, Herz Laura¹, Johnston Michael¹

¹ University of Oxford,
² Institut für Quantenelektronik ETH Zürich,
³ Technical University of Moldova,
⁴ Academy of Sciences of Moldova

Disponibil în IBN: 10 aprilie 2018

Rezumat

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.

Cuvinte-cheie
Electric conductivity, indium phosphide

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