Cold field emission dominated photoconductivity in ordered three-dimensional assemblies of octapod-shaped CdSe/CdS nanocrystals

Yang Zhang; Karol Miszta; Liberato Manna; Enzo M. Di Fabrizio; Roman Krahne

doi:10.1039/c3nr01588b

Cold field emission dominated photoconductivity in ordered three-dimensional assemblies of octapod-shaped CdSe/CdS nanocrystals

Yang Zhang, Karol Miszta, Liberato Manna, Enzo M. Di Fabrizio, Roman Krahne

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

8 Scopus citations

Abstract

Semiconductor nanocrystals, especially their ordered assemblies, are promising materials for various applications. In this paper, we investigate the photoconductive behavior of sub-micron size, ordered three-dimensional (3D) assemblies of octapod-shaped CdSe/CdS nanocrystals that are contacted by overlay electron-beam lithography. The regular structure of the assemblies leads to photocurrent-voltage curves that can be described by the cold field electron emission model. Mapping of the photoconductivity versus excitation wavelength and bias voltage allows the extraction of the band gap and identification of the photoactive region in the voltage and spectral domain. These results have important implications for the understanding of photoconductive transport in similar systems. © 2013 The Royal Society of Chemistry.

Original language	English (US)
Pages (from-to)	7596
Journal	Nanoscale
Volume	5
Issue number	16
DOIs	https://doi.org/10.1039/c3nr01588b
State	Published - 2013

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: L.M. acknowledges financial support from European Union through the FP7 starting ERC grant NANO-ARCH (contract number 240111).

ASJC Scopus subject areas

General Materials Science

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10.1039/c3nr01588b

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title = "Cold field emission dominated photoconductivity in ordered three-dimensional assemblies of octapod-shaped CdSe/CdS nanocrystals",

abstract = "Semiconductor nanocrystals, especially their ordered assemblies, are promising materials for various applications. In this paper, we investigate the photoconductive behavior of sub-micron size, ordered three-dimensional (3D) assemblies of octapod-shaped CdSe/CdS nanocrystals that are contacted by overlay electron-beam lithography. The regular structure of the assemblies leads to photocurrent-voltage curves that can be described by the cold field electron emission model. Mapping of the photoconductivity versus excitation wavelength and bias voltage allows the extraction of the band gap and identification of the photoactive region in the voltage and spectral domain. These results have important implications for the understanding of photoconductive transport in similar systems. {\textcopyright} 2013 The Royal Society of Chemistry.",

author = "Yang Zhang and Karol Miszta and Liberato Manna and {Di Fabrizio}, {Enzo M.} and Roman Krahne",

note = "KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: L.M. acknowledges financial support from European Union through the FP7 starting ERC grant NANO-ARCH (contract number 240111).",

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T1 - Cold field emission dominated photoconductivity in ordered three-dimensional assemblies of octapod-shaped CdSe/CdS nanocrystals

AU - Zhang, Yang

AU - Miszta, Karol

AU - Manna, Liberato

AU - Di Fabrizio, Enzo M.

AU - Krahne, Roman

N1 - KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: L.M. acknowledges financial support from European Union through the FP7 starting ERC grant NANO-ARCH (contract number 240111).

PY - 2013

Y1 - 2013

N2 - Semiconductor nanocrystals, especially their ordered assemblies, are promising materials for various applications. In this paper, we investigate the photoconductive behavior of sub-micron size, ordered three-dimensional (3D) assemblies of octapod-shaped CdSe/CdS nanocrystals that are contacted by overlay electron-beam lithography. The regular structure of the assemblies leads to photocurrent-voltage curves that can be described by the cold field electron emission model. Mapping of the photoconductivity versus excitation wavelength and bias voltage allows the extraction of the band gap and identification of the photoactive region in the voltage and spectral domain. These results have important implications for the understanding of photoconductive transport in similar systems. © 2013 The Royal Society of Chemistry.

AB - Semiconductor nanocrystals, especially their ordered assemblies, are promising materials for various applications. In this paper, we investigate the photoconductive behavior of sub-micron size, ordered three-dimensional (3D) assemblies of octapod-shaped CdSe/CdS nanocrystals that are contacted by overlay electron-beam lithography. The regular structure of the assemblies leads to photocurrent-voltage curves that can be described by the cold field electron emission model. Mapping of the photoconductivity versus excitation wavelength and bias voltage allows the extraction of the band gap and identification of the photoactive region in the voltage and spectral domain. These results have important implications for the understanding of photoconductive transport in similar systems. © 2013 The Royal Society of Chemistry.

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JO - Nanoscale

JF - Nanoscale

IS - 16

ER -

Cold field emission dominated photoconductivity in ordered three-dimensional assemblies of octapod-shaped CdSe/CdS nanocrystals

Abstract

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