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Preparation and Photoelectrochemical Study of Nanocrystalline ZnO Photoanode Electrodes with Controllable Band Gap

Author: ChenHaiYan
Tutor: YangYuLin
School: Harbin Institute of Technology
Course: Inorganic Chemistry
Keywords: Hydrothermal method Dye-sensitized solar cells ZnO nanocrystals Nitrogen-doped
CLC: TM914.4
Type: Master's thesis
Year: 2009
Downloads: 63
Quote: 0
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Abstract


This selection of N-doped ZnO nanorods morphology of ZnO nanocrystals as dye-sensitized solar cell photoanode material characterization by XRD, SEM, XPS, UV-vis and photoelectric performance test method , the study of nitrogen doping on ZnO band gap and battery photoelectric performance ; different morphologies of ZnO on the battery performance . Hydrothermal Synthesis of morphology and size of ZnO nanocrystals . Zinc acetate , sodium hydroxide as the raw material, in the pH to 13,180 ° C hydrothermally reacted for 19h prepared to give a diameter of about 100 nm , a length of 1.5 ~ 2μm ZnO nanorods ; 12,164 ℃ hydrothermal reaction at a pH of 19h was prepared having a particle diameter of 80 ~ 100nm ZnO nanospheres ; in the pH of 12,102 ℃ hydrothermal reaction 4h Preparation average diameter of about 200nm ZnO nanosheets . Zinc acetate and ammonia as raw materials, the reaction at a pH of 7,164 ° C hydrothermally 17H , was prepared by a length of 2 to 4 μm , a diameter of about 200nm, in both ends of the small intermediate large spindle-shaped ZnO nanocrystals . Nitrogen-doped ZnO nanorods powder and ZnO films , respectively . N-doped ZnO nanorods powder applied to the dye-sensitized solar cell ( DSSC) when the battery photoelectric good way to improve performance . Non - nitrogen-doped ZnO nanorods prepared DSSC, photoelectric conversion efficiency was 0.67 % ; N - doped ZnO nanorods DSSC prepared , when the N content is 0.82% , the band gap corresponding to the ZnO 3.228eV , a photoelectric conversion of the battery The efficiency η increased to 1.32% . N -doped ZnO film is applied to the DSSC when , due to the presence of thermal stress in the course of the reaction in a nitrogen - doped , the effect did not reach the expected improvement in the battery performance . ZnO nanorod film , ZnO the nanospheres films , ZnO nanosheets film as photoanode assembled dye-sensitized solar cells . Different morphology and size of ZnO nanocrystals on the battery performance . The results showed that a large specific surface area capable of adsorbing more dyes, played a key role to improve the current of the battery . In simulated sunlight , the incident light intensity 100mW · cm-2 of irradiation to the particle diameter of of ZnO nanospheres of 80 ~ 100nm film of the ZnO nanospheres the assembled dye-sensitized solar cell performance , the open circuit photovoltage is 0.465V, the short - circuit photocurrent density 6.950mA · cm-2, a fill factor of 0.392, the total photoelectric conversion efficiency was 1.30% .

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