Polarized Optical Properties of Single Zinc Oxide Nanowire
Date Issued
2007
Date
2007
Author(s)
Chien, Chih-Tao
DOI
zh-TW
Abstract
Because of the lithography technique approaches the physical limit, it must to elstablish some new process to manufacture the smaller device. There is a new method to make the devices which use the single nanowire as the building blocks. There are two apparent advantages for nanowires. First, nanowires belong to one-demensional structure, so they have better electrical transportation and optical propagation properties. Second, the material size could be adjusted by controlling the parametrs of the process. So there is a great opportunity to replace the lithography process in the future. The basic properties are not all the same between the ensembles and the single nanowire, so in this thesis we focus on the single nanowire optical properties.
In our experiment the zinc oxide nanowires are synthesized by chemical bath deposition (CBD) and the diameter is about 10μm. The preparation of the single nanowire specimen is tapping the back of the ensembles substrate and then the wires would be dispersed on the silicon wafer. After that we will measure the polarization optical properties of single nanowire, in this thesis we concentrate on the green defect emission. Optical measurement would be separated into three parts (1) photoluminescence polarization spectrum (PL) (2)time-resolved photoluminescence polarization spectrum (TRPL) (3)Raman polarization spectrum. In the PL spectrum, we find out that the defect emission would be stronger along the long axis and is opposite to the exciton emission. In TRPL spectrum, the lifetime of the defect band would be shorter along the long axis. In the Raman spectrum, the main phonon modes will be changed due to different laser polarization.
Subjects
化學浴沉積法；單根奈米線；極化；光致激發光譜；時間解析光致激發光譜；拉曼光譜
chemical bath deposition (CBD)
polarization
PL spectrum
TRPL spectrum
Raman spectrum
phonon
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-96-R93527074-1.pdf
Size
23.53 KB
Format
Adobe PDF
Checksum
(MD5):2d6e6bfc9b6304084eb282b9e5de3bf3