Full metadata
Title
Quantum efficiency measurement of nanowires using integrating sphere
Description
This thesis mainly focuses on the study of quantum efficiency (QE) and its measurement, especially for nanowires (NWs). First, a brief introduction of nano-technology and nanowire is given to describe my initial research interest. Next various fundamental kinds of recombination mechanisms are described; both for radiative and non-radiative processes. This is an introduction for defining the internal quantum efficiency (IQE). A relative IQE measurement method is shown following that. Then it comes to the major part of the thesis discussing a procedure of quantum efficiency measurement using photoluminescence (PL) method and an integrating sphere, which has not been much applied to nanowires (NWs). In fact this is a convenient and useful approach for evaluating the quality of NWs since it considers not only the PL emission but also the absorption of NWs. The process is well illustrated and performed with both wavelength-dependent and power-dependent measurements. The measured PLQE is in the range of 0.3% ~ 5.4%. During the measurement, a phenomenon called photodegradation is observed and examined by a set of power-dependence measurements. This effect can be a factor for underestimating the PLQE and a procedure is introduced during the sample preparation process which managed to reduce this effect for some degree.
Date Created
2012
Contributors
- Chen, Dongzi (Author)
- Ning, Cun-Zheng (Thesis advisor)
- Zhang, Yong-Hang (Committee member)
- Yu, Hongbin (Committee member)
- Arizona State University (Publisher)
Topical Subject
Resource Type
Extent
v, 52 p. : ill. (some col.)
Language
Copyright Statement
In Copyright
Primary Member of
Peer-reviewed
No
Open Access
No
Handle
https://hdl.handle.net/2286/R.I.14704
Statement of Responsibility
by Dongzi Chen
Description Source
Viewed on Feb. 28, 2013
Level of coding
full
Note
Partial requirement for: M.S., Arizona State University, 2012
Note type
thesis
Includes bibliographical references (p. 51-52)
Note type
bibliography
Field of study: Electrical engineering
System Created
- 2012-08-24 06:19:54
System Modified
- 2021-08-30 01:47:47
- 2 years 8 months ago
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