Carrier lifetime and mobility enhancement in nearly defect-free core-shell nanowires measured using time-resolved terahertz spectroscopy

Patrick Parkinson; Hannah J. Joyce; Qiang Gao; Hark Hoe Tan; Xin Zhang; Jin Zou; Chennupati Jagadish; Laura M. Herz; Michael B. Johnston

doi:10.1021/nl9016336

Carrier lifetime and mobility enhancement in nearly defect-free core-shell nanowires measured using time-resolved terahertz spectroscopy

Patrick Parkinson, Hannah J. Joyce, Qiang Gao, Hark Hoe Tan, Xin Zhang, Jin Zou, Chennupati Jagadish, Laura M. Herz, Michael B. Johnston

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

274 Citations (Scopus)

Abstract

We have used transient terahertz photoconductivity measurements to assess the efficacy of two-temperature growth and core-shell encapsulation techniques on the electronic properties of GaAs nanowires. We demonstrate that two-temperature growth of the GaAs core leads to an almost doubling in charge-carrier mobility and a tripling of carrier lifetime. In addition, overcoating the GaAs core with a larger-bandgap material is shown to reduce the density of surface traps by 82%, thereby enhancing the charge conductivity.

Original language	English
Pages (from-to)	3349-3353
Number of pages	5
Journal	Nano Letters
Volume	9
Issue number	9
DOIs	https://doi.org/10.1021/nl9016336
Publication status	Published - 9 Sept 2009

Access to Document

10.1021/nl9016336

Cite this

@article{ca4c1904466b4e7592ec665a859a6e9a,

title = "Carrier lifetime and mobility enhancement in nearly defect-free core-shell nanowires measured using time-resolved terahertz spectroscopy",

abstract = "We have used transient terahertz photoconductivity measurements to assess the efficacy of two-temperature growth and core-shell encapsulation techniques on the electronic properties of GaAs nanowires. We demonstrate that two-temperature growth of the GaAs core leads to an almost doubling in charge-carrier mobility and a tripling of carrier lifetime. In addition, overcoating the GaAs core with a larger-bandgap material is shown to reduce the density of surface traps by 82\%, thereby enhancing the charge conductivity.",

author = "Patrick Parkinson and Joyce, \{Hannah J.\} and Qiang Gao and Tan, \{Hark Hoe\} and Xin Zhang and Jin Zou and Chennupati Jagadish and Herz, \{Laura M.\} and Johnston, \{Michael B.\}",

year = "2009",

month = sep,

day = "9",

doi = "10.1021/nl9016336",

language = "English",

volume = "9",

pages = "3349--3353",

journal = "Nano Letters",

issn = "1530-6984",

publisher = "American Chemical Society",

number = "9",

}

TY - JOUR

T1 - Carrier lifetime and mobility enhancement in nearly defect-free core-shell nanowires measured using time-resolved terahertz spectroscopy

AU - Parkinson, Patrick

AU - Joyce, Hannah J.

AU - Gao, Qiang

AU - Tan, Hark Hoe

AU - Zhang, Xin

AU - Zou, Jin

AU - Jagadish, Chennupati

AU - Herz, Laura M.

AU - Johnston, Michael B.

PY - 2009/9/9

Y1 - 2009/9/9

N2 - We have used transient terahertz photoconductivity measurements to assess the efficacy of two-temperature growth and core-shell encapsulation techniques on the electronic properties of GaAs nanowires. We demonstrate that two-temperature growth of the GaAs core leads to an almost doubling in charge-carrier mobility and a tripling of carrier lifetime. In addition, overcoating the GaAs core with a larger-bandgap material is shown to reduce the density of surface traps by 82%, thereby enhancing the charge conductivity.

AB - We have used transient terahertz photoconductivity measurements to assess the efficacy of two-temperature growth and core-shell encapsulation techniques on the electronic properties of GaAs nanowires. We demonstrate that two-temperature growth of the GaAs core leads to an almost doubling in charge-carrier mobility and a tripling of carrier lifetime. In addition, overcoating the GaAs core with a larger-bandgap material is shown to reduce the density of surface traps by 82%, thereby enhancing the charge conductivity.

UR - https://www.scopus.com/pages/publications/70349943996

U2 - 10.1021/nl9016336

DO - 10.1021/nl9016336

M3 - Article

SN - 1530-6984

VL - 9

SP - 3349

EP - 3353

JO - Nano Letters

JF - Nano Letters

IS - 9

ER -

Carrier lifetime and mobility enhancement in nearly defect-free core-shell nanowires measured using time-resolved terahertz spectroscopy

Abstract

Access to Document

Other files and links

Fingerprint

Cite this