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Increasing Dye-Sensitized Solar Cell Efficiency by ZnO Spin-Coating of the TiO<sub>2</sub>Electrode: Effect of ZnO Amount

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Energy and Power Engineering 2013年第10期5卷 591-595页

作者： fahd al-juaid Amar Merazga Physics Department Faculty of Science Taif University Taif Saudi Arabia

This paper is concerned with the improvement of dye-sensitized solar cell (DSSC) efficiency upon ZnO-coating of the TiO2 electrode. Sol-gel ZnO of controlled amount by varying the number of sol drops during spin-coating is shown to increase the DSSC efficiency. The highest efficiency is obtained at a single sol drop with enhancement of 40%, while beyond this amount the efficiency falls down sharply to zero. Based on measured optical absorption spectra of the different dye-loaded electrodes, it is concluded that this amount of ZnO sol corresponds to the thinnest layer that can create the energy barrier to minimize the electron recombination rate without seriously affecting the dye adsorption efficiency of the TiO2 film.

关键词： ZnO Spin-Coating Dye-Sensitized Solar Cell Efficiency

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ZnO Spin-Coating of TiO<sub>2</sub>Photo-Electrodes to Enhance the Efficiency of Associated Dye-Sensitized Solar Cells

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World Journal of Condensed Matter Physics 2012年第4期2卷 192-196页

作者： fahd al-juaid Amar Merazga Fouad Abdel-Wahab Mohamed al-Amoudi Department of Chemistry Taif University Taif KSA Department of Physics Taif University Taif KSA

Dye-sensitized solar cells (DSSCs) with ZnO spin-coated TiO2 photo-electrodes are compared to DSSC with a bare TiO2 photo-electrode. It is demonstrated that the deposited ZnO of controlled amount, by varying the precursor concentration in the coating sol, can indeed enhance the performance of the DSSC. The measured power conversion efficiency shows a maximum around the precursor concentration 0.1 M and falls down sharply to 0% beyond this point. The results are interpreted on the basis of two competing factors: At ZnO concentrations less than 0.1 M, the formation of an energy barrier increases the photocurrent by reducing the rate of interfacial back-recombination. At ZnO concentrations greater than 0.1 M, the screening of the TiO2 film by thicker ZnO layers decreases the photocurrent through the reduction of TiO2 dye-adsorption efficiency.

关键词： TiO2 Photo-Electrodes ZnO Sol-Gel Spin-Coating Dye-Sensitized Solar Cells Power Conversion Efficiency

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