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ZnO Nanostructures towards Photoanode of Solar Cells-Synthesis and Properties

Author: JieYang
Tutor: DuXiWen
School: Tianjin University
Course: Materials Science
Keywords: Hydrothermal method Different morphology of ZnO structures Spend tube Nanowire
CLC: TM914.4
Type: Master's thesis
Year: 2010
Downloads: 182
Quote: 0
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Abstract


Dye-sensitized solar cells as a new generation of solar cells has caused widespread concern in the scientific community , the study of light anode material naturally become a hot spot , and as TiO 2 best alternative material ZnO has TiO 2 similar bandgap , but its relative permittivity is smaller, the electron mobility is faster , and easy to prepare a variety of morphologies , light anode focus of the study . Using hydrothermal method and electrochemical etching in low temperature conditions were prepared with different morphologies of ZnO structure , these structures : nanowires, block , nanotubes , spent on the down tube structure , complex structures . ZnO nanowires obtained due to the continuous adsorption of raw materials HMT in the side of the nanowire ; With the increase of the concentration of the reaction solution , nanowires longer thicker surrounded into Nanosolids ; the nanotubes EDA hydrolysis OH - nano block along the pole face down are etched ; spent on the down tube is the result of non - uniform etching HMT hydrolysis at high temperatures OH - < / sup > ; continue as the temperature increased, the time to continue to grow , this more uneven etching , a part of the flower -shaped part of the tubular portion exposed complex structure . In order to study the performance of different morphologies of ZnO structure , the battery performance test , desorption tests and electrochemical impedance spectroscopy . The test results show that the nanowires , although the smaller the amount of dye adsorption efficiency is low , but has a maximum dye utilization and minimum electron transport resistance ; tube on flower structure demonstrated the highest efficiency of the battery , because it has the largest dye the adsorption amount and a smaller transfer resistance ; nanosolids and nanotubes impedance , less dye adsorption efficiency is very low ; rather complex structure , despite the larger the amount of dye adsorption , but it appears that a short-circuit problem , the battery is inefficient . So, to say , on the flower tube structure is the most suitable anode structure of ZnO light of the nanowire is a very research potential of the structure .

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Photocell > Solar cells
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