Effect of sol–gel MgO spin-coating on the performance of TiO2-based dye-sensitized solar cells |
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| Affiliation: | 1. Taif University, Faculty of Science, Physics department, Taif, Saudi Arabia;2. Taiba University, Faculty of Science, Physics department, Al-Madina, Saudi Arabia;3. King Saud University, College of Science, Department of Chemistry, Riyadh, Saudi Arabia;1. Centre of Excellence in Solid State Physics, University of the Punjab, Lahore 54590, Pakistan;2. Department of Electronics, University of York, UK;1. School of Physics and Electronic Information, Huaibei Normal University, Huaibei 235000, People’s Republic of China;2. Department of Pharmacy, Anhui University of Traditional Chinese Medicine, Hefei 230012, People’s Republic of China;1. Département de Chimie, Faculté des Sciences de la Matière, Université Ibn Khaldoun de Tiaret, Algeria;2. Department of Physics, Electronic Microscopy and Materials Sciences Laboratory, Sciences and Technology University of Oran, BP1505El M’NAOUAR, Algeria;3. Department of Chemistry, Synthesis and Catalysis Laboratory, Ibn Khaldoun University of Tiaret, BP P 78 Zaaroura, Tiaret, Algeria;1. Department of Physics, Lanzhou University of Technology, Lanzhou 730050, PR China;2. State Key Laboratory of Advanced Nonferrous Materials, Lanzhou University of Technology, Lanzhou 730050, PR China;1. Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843, USA;2. Department of Chemistry, Texas A&M University, College Station, TX 77840, USA;3. Department of Materials Science and Engineering, Texas A&M University, College Station, TX 77840, USA |
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| Abstract: | This paper is concerned with the improvement of dye-sensitized solar cell (DSSC) efficiency upon MgO post-treatment of the TiO2 electrode. A simple sol–gel technique, involving magnesium acetate as precursor, ethanol as solvent and nitric acid as stabilizer, is applied to prepare a solution of suspended MgO nanoparticles. A single drop of MgO sol at 0.1 M precursor concentration was spin-coated at 3000 rpm for 30 s onto the TiO2 electrode and sintered at 500 K for 1 h. Dye-loading using N3-dye was applied for 6 h. An increase in the average efficiency of the DSSC from 2.5% to 3.9% (over 50% enhancement) was recorded. Measurements of the dark I–V characteristics, the open circuit voltage decays, the SEM images and the dye absorbance spectra, for both uncoated and MgO-coated electrodes were examined. The improvement of the DSSC efficiency was attributed to an upward shift of the TiO2 flat band energy and a reduction of the rate of back-transport and recombination. |
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| Keywords: | Sol–gel MgO Spin-coating Dye-sensitized solar cell Conversion efficiency |
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