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The Performance of Metal Phthalocyanine in Dye-sensitized Solar Cell

Author: ZhuJingYan
Tutor: GaoYanMin
School: Jiangsu University of Science and Technology
Course: Materials Science
Keywords: Metal phthalocyanine synthesis sensitizer dye-sensitized solar cell photoelectric conversion efficiency
CLC: TM914.4
Type: Master's thesis
Year: 2011
Downloads: 145
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Abstract


Sensitized dye is an important role in DSSC. Nowadays researches are focus on rare dyes, which are high in cost as well as toxic that will effect their using. So experts are working hard to overcome these disadvantages currently. Metal phtahlocynine and its derivatives have many advantages such as non-toxic, good light stability and in red and near infrared region these dyes have strongly sorption. Therefore they can be well potential materials. However phthalocyanine dye can not exist long after excitation and this stop the charge removing, gathering on the surface of electrode.In order to get the better performance we can design and optimize the phthalocyanine molecule. The basic idea is that introducing the carboxyl which can react with nm-TiO2 to the phtaalocyanine ring in order to expand the absorbance scope of phtahalocyanine molecules. At the same time we syntheized dinuclear metal phthalocyanine and studied the effect of expanding conjugated systems and different metal ions on dye. At last we try to complex metal phthalocyanine salt and N719 dye with sensitized nanocrystalline titanium dioxide films to make the cell and analyze its properties.In this paper, we syntheized melt phthalocyanine with phthalic anhydride - urea and all the productions would be analyzed by IR, UV-visible spectroscopy, cyclic voltammetry and thermal gravimetric analysis. The result as follow: with the introduction of different metal center icons, the vibration frequency of metal-ligand in single-core metal phthalocyanine and planar binuclear metal phthalocyanine is speeded as Zn>Cu>Fe. The Q belt of the former phthalocyanine salt in UV-Vis is traversing as the increase mount of the eletronics in central ion valence d and the order is Zn>Cu>Fe. In CV curves analysis, the redox potential order of two types of phthalocyanine salt is Fe（Ⅱ）>Cu（Ⅱ）>Zn（Ⅱ） according the reducing polarization ability of the central compounds. According TG-DTA, the stability order of the two types salt under air is Cu> Zn> Fe.Compared with single-core metal phthalocyanine, the metal stretching vibration frequency of dual-core phthalocyanine is slightly higher in IR spectra. The Q belt has a large red shift and there is a small peak appears in 800900 nm. The thermodynamic stability of binuclear phthalocyanine are significantly improved. Through comparing the band structure parameters of synthetic dyes with that of TiO2, we found that synthetic dyes can match all the requirements of energy level. DSSC were made with different synthetic dye, we tested the properties of these dye-sensitized solar cells and studied the sensitization effect of different phthalocyanine.It shows that compared with dual-core phthalocyanine, single-core phthalocyanine has higher short-circuit current density and photoelectric conversion. Zinc phthalocyanine battery which has the maximum extinction coefficient is the best choice.At last we try to complex metal phthalocyanine salt and N719 dye with sensitized nanocrystalline titanium dioxide films to make the cell and analyze its properties by ultraviolet - visible absorption spectra and I-V curves. The results show that, when ZnPc（COOH）4/ b-ZnPc（COOH）6 sensitized with the N719 coordination, the property of ZnPc（COOH）4 is better than that of b-ZnPc（COOH）6. Coordination of the two dye-sensitized is better than single phthalocyanine. The ZnPc（COOH）4 and N719 co-sensitized has higher short-circuit current density and photoelectric conversion.

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