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Research of Dye-Sensitized Solar Cells Based on Composite Photoanode

Author: ZhaoWang
Tutor: WeiAiXiang
School: Guangdong University of Technology
Course: Microelectronics and Solid State Electronics
Keywords: Dye-sensitized solar cells Composite photoanode Electrochemical impedance spectroscopy Sol - gel technology Photovoltaic performance
CLC: TM914.4
Type: Master's thesis
Year: 2011
Downloads: 218
Quote: 1
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Abstract


Solar photovoltaic technology supported use of solar energy is to bring revolutionary change in mankind's energy consumption structure. Mainstream products of solar cells is silicon-based solar cells, but the high cost of silicon-based solar cells, the supply of raw materials. Dye-sensitized solar cells (Dye-Sensitized Solar Cell, DSSC) cheap cost, rich in natural resources, stable performance, the production process is simple, non-toxic, non-polluting and is suitable for large-scale production and other advantages, there is likely to replace silicon solar cells, to become the next dominant solar cells. This paper focuses on the preparation of the the photoanode composite films based on TiO2 nanoparticles / nanowires and ZnO/TiO2 two kinds of dye-sensitized solar cells technology, photovoltaic and electrochemical properties of specific research contents are as follows: Based on TiO2 nanoparticles / nano study of the composite photoanode line of dye-sensitized solar cells. Hydrothermal synthesis technology to prepare TiO2 nanowires powder, and then using the sol - gel prepared by tetrabutyl titanate sol, adding an appropriate amount to the sol TiO2 nanowires preparation of gel slurry dip in transparent conductive glass Preparation of TiO2 nano particle / nanowire composite film photoanode. By XRD, SEM, battery JV characteristics test, the researchers of TiO2 nanowires add the amount of light the anode structure, morphology and photovoltaic performance of the battery. The results show that: TiO2 nanoparticle / nanowire composite film of TiO2 nanowires is more evenly distributed, and the formation of network-like structures that are connected to each other; With the increase in the amount of the TiO2 nanowires add sol, battery short-circuit current density Jsc 1.84mA / In cm2 to 13.50mA/cm2, the energy conversion efficiency has never add the TiO2 nanowires 0.85% to 6.61%, the open circuit voltage and fill factor remain basically unchanged. ZnO/TiO2 composite photoanode of dye-sensitized solar cells. ZnO microrods prepared using low temperature aqueous solution legal system, and then ZnO microrods TiO2 nano powder mixed in different proportions to prepare composite slurry, blade coating method is applied on a transparent conductive glass to prepared ZnO/TiO2 composite film photoanode. By XRD, SEM, battery JV characteristics test, the ratio of the of ZnO microrods Ti02 nano powder, optical the anode morphology and cell photovoltaic performance impact. The results show that: the mass ratio of ZnO and TiO2 50:50 highest efficiency of DSSC At that time, the photoelectric conversion efficiency was increased by 31% more efficient than a pure TiO2 battery, this is mainly due to the ZnO microrods higher light utilization and a good electronic transfer characteristics. The dye-sensitized solar cell electrochemical impedance spectroscopy analysis. In this paper, electrochemical impedance spectroscopy impedance characteristics of the electron transfer processes in dye-sensitized solar cells. According to the test under the different positive and negative bias conditions to obtain the dye-sensitized solar cell impedance diagram, combined with the working principle of the DSSC, the establishment of the equivalent circuit model of DSSC under different bias conditions. And use the model to fit the measured impedance spectra under different bias, fitting better results consistent with the measured impedance spectra to obtain more reasonable values ??of the parameters of the various components in the equivalent circuit model, indicating that the establishment of the equivalent circuit model is reasonable. The measured impedance spectrum analysis, studied impedance spectroscopy different bias changes, and analysis of the battery internal impedance distribution. The results show that the charge transfer resistance of the transfer impedance photoanode / dye / electrolyte interface: Electronic photoanode main factors affect the the DSSC internal impedance. With the increase of the added amount of the nanowires, TiO2 nanoparticles / nanowires composite photoanode DSSC in electron transfer impedance and TiO 2 / dye / electrolyte interface charge transfer resistance is significantly reduced. ZnO/TiO2 composite photoanode DSSC, IF area reflects the electronic the photoanode transmission characteristics frequency decreases with the increase of ZnO

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