Title page for etd-0719114-112011


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URN etd-0719114-112011
Author Yung-chin Chu
Author's Email Address No Public.
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Department Electrical Engineering
Year 2013
Semester 2
Degree Master
Type of Document
Language English
Title Characterization of Zinc Oxide Nanotip Array Prepared by Aqueous Solution Deposition under UV Light Illumination
Date of Defense 2014-07-25
Page Count 117
Keyword
  • aqueous solution deposition (ASD)
  • zinc oxide (ZnO)
  • nanotip
  • solar cell
  • moth eye principle
  • anti-reflection
  • ultraviolet (UV)
  • Abstract In this study, zinc oxide (ZnO) nanotip array will be grown on ZnO nucleation layer by aqueous solution deposition (ASD) at low temperature. Characteristics of the ZnO nanotip array will be investigated. We will discuss the morphology of ZnO nanotip array and the moth-eye effect. The micro-PL analysis of ZnO nanotip array shows the typical emissions of narrow exciton related UV band peak at 375 nm and broad defect related green–yellow (550~650 nm) bands. The green-yellow emission (550~650 nm) is likely due to O vacancies and the emission is improved after N2O annealing at 300oC. Under UV light illumination, the electron-hole pairs are generated in ZnO by the photoexcitation and then the pairs diffuse to the surface. Holes could enhance the decomposition of ammonia and hence the concentration of OH- will be increased. The growth rate of ZnO nanotip array can be enhanced under ultraviolet light illumination. Characterizations of ASD-ZnO and UV-ASD-ZnO nanotip array will also be discussed. UV-ASD-ZnO has worse quality because the high growth rate may produce more defects in the structure. ZnO nanotip array with rough surface decreases reflection, so we use ZnO nanotip array as an anti-reflection layer. After growing ZnO nanotip array on single-Si solar cell under UV illumination, the efficiency of solar cell is increased.
    The morphology is observed by field emission scanning electron microscope (FE-SEM). The physical properties are characterized by X-ray diffraction (XRD). The optical properties are measured by Micro-photoluminescence (Micro-PL). The coordination modes are measured by Fourier-transform infrared spectrometer (FTIR). The performance of the cells is measured by a semiconductor device analyzer. In our results, UV illumination is used for enhancing the growth rate of ZnO nanotip array, and we grow the high performance of ZnO nanotip array on single-Si solar cell to increase the efficiency. The efficiency is increased from 10.10% to 10.51%. After thermal annealing, the efficiency can be improved, for example, from 11.13% to 11.66%.
    Advisory Committee
  • Wen Tai Lin - chair
  • Chung-Cheng Chang - co-chair
  • Ikai Lo - co-chair
  • Ming Kwei Lee - advisor
  • Ying-Chung Chen - advisor
  • Files
  • etd-0719114-112011.pdf
  • Indicate in-campus at 99 year and off-campus access at 99 year.
    Date of Submission 2014-08-19

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