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

被引：11

作者：

Li, Mingjie ^{[1
]}

Wu, Bo ^{[1
]}

Ekahana, Sandy Adhitia ^{[1
]}

Utama, Muhammad Iqbal Bakti ^{[1
]}

Xing, Guichuan ^{[1
]}

Xiong, Qihua ^{[1
,2
]}

Sum, Tze Chien ^{[1
]}

Zhang, Xinhai ^{[3
]}

机构：

[1] Nanyang Technol Univ, Sch Phys Math Sci, Div Phys Appl Phys, Singapore 63737, Singapore

[2] Nanyang Technol Univ, Sch Elect & Elect Engn, Div Microelect, Singapore 639798, Singapore

[3] Inst Mat Res & Engn, Singapore 117602, Singapore

来源：

APPLIED PHYSICS LETTERS | 2012年 / 101卷 / 09期

关键词：

CARRIER DYNAMICS; NANOWIRES;

D O I：

10.1063/1.4748300

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4748300]

引用

页数：5

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