Size and surface effects on transient photoconductivity in CdS nanobelts probed by time-resolved terahertz spectroscopy

Mingjie Li; Bo Wu; Sandy Adhitia Ekahana; Muhammad Iqbal Bakti Utama; Guichuan Xing; Qihua Xiong; Tze Chien Sum; Xinhai Zhang

doi:10.1063/1.4748300

Size and surface effects on transient photoconductivity in CdS nanobelts probed by time-resolved terahertz spectroscopy

Mingjie Li, Bo Wu, Sandy Adhitia Ekahana, Muhammad Iqbal Bakti Utama, Guichuan Xing, Qihua Xiong, Tze Chien Sum, Xinhai Zhang

Research output: Journal article publication › Journal article › Academic research › peer-review

13 Citations (Scopus)

Abstract

Ultrafast optical-pump terahertz probe spectroscopy was performed over a graduated size distribution of CdS nanobelts to investigate the size and surface effects on the transient photoconductivity. It was found that the nanobelt size has a profound influence on the carrier localization and photoconductivity dynamics, brought about by the carrier trapping at surface defects. The strong carrier localization in the nanobelt is ascribed to the internal surface boundaries arising from the surface depletion layer. The increased thickness of surface depletion layer due to a continuous trapping of photocarriers at surface defects results in more pronounced carrier localization after photoexcitation.

Original language	English
Article number	091104
Journal	Applied Physics Letters
Volume	101
Issue number	9
DOIs	https://doi.org/10.1063/1.4748300
Publication status	Published - 27 Aug 2012
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.4748300

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title = "Size and surface effects on transient photoconductivity in CdS nanobelts probed by time-resolved terahertz spectroscopy",

abstract = "Ultrafast optical-pump terahertz probe spectroscopy was performed over a graduated size distribution of CdS nanobelts to investigate the size and surface effects on the transient photoconductivity. It was found that the nanobelt size has a profound influence on the carrier localization and photoconductivity dynamics, brought about by the carrier trapping at surface defects. The strong carrier localization in the nanobelt is ascribed to the internal surface boundaries arising from the surface depletion layer. The increased thickness of surface depletion layer due to a continuous trapping of photocarriers at surface defects results in more pronounced carrier localization after photoexcitation.",

author = "Mingjie Li and Bo Wu and Ekahana, {Sandy Adhitia} and Utama, {Muhammad Iqbal Bakti} and Guichuan Xing and Qihua Xiong and Sum, {Tze Chien} and Xinhai Zhang",

note = "Funding Information: This work is supported by the following research grants: NTU start-up Grant (M58110068) and an Academic Research Fund (AcRF) Tier 1–RG 49/08 (M52110082). Q.X. acknowledges the start-up grant support (M58110061) and the New Initiative Fund (M58110100) from NTU. ",

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AU - Li, Mingjie

AU - Wu, Bo

AU - Ekahana, Sandy Adhitia

AU - Utama, Muhammad Iqbal Bakti

AU - Xing, Guichuan

AU - Xiong, Qihua

AU - Sum, Tze Chien

AU - Zhang, Xinhai

N1 - Funding Information: This work is supported by the following research grants: NTU start-up Grant (M58110068) and an Academic Research Fund (AcRF) Tier 1–RG 49/08 (M52110082). Q.X. acknowledges the start-up grant support (M58110061) and the New Initiative Fund (M58110100) from NTU.

PY - 2012/8/27

Y1 - 2012/8/27

N2 - Ultrafast optical-pump terahertz probe spectroscopy was performed over a graduated size distribution of CdS nanobelts to investigate the size and surface effects on the transient photoconductivity. It was found that the nanobelt size has a profound influence on the carrier localization and photoconductivity dynamics, brought about by the carrier trapping at surface defects. The strong carrier localization in the nanobelt is ascribed to the internal surface boundaries arising from the surface depletion layer. The increased thickness of surface depletion layer due to a continuous trapping of photocarriers at surface defects results in more pronounced carrier localization after photoexcitation.

AB - Ultrafast optical-pump terahertz probe spectroscopy was performed over a graduated size distribution of CdS nanobelts to investigate the size and surface effects on the transient photoconductivity. It was found that the nanobelt size has a profound influence on the carrier localization and photoconductivity dynamics, brought about by the carrier trapping at surface defects. The strong carrier localization in the nanobelt is ascribed to the internal surface boundaries arising from the surface depletion layer. The increased thickness of surface depletion layer due to a continuous trapping of photocarriers at surface defects results in more pronounced carrier localization after photoexcitation.

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U2 - 10.1063/1.4748300

DO - 10.1063/1.4748300

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VL - 101

JO - Applied Physics Letters

JF - Applied Physics Letters

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M1 - 091104

ER -

Size and surface effects on transient photoconductivity in CdS nanobelts probed by time-resolved terahertz spectroscopy

Abstract

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