Photovoltaic characteristics of dye-sensitized surface-modified nanocrystalline SnO2 solar cells |
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| Institution: | 1. Department of Physics, The University of Hong Kong, Pokfulam Road, Hong Kong;2. Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong;1. Centre for Nanoscience and Technology, Pondicherry University, Kalapet, Puducherry, 605014, India;2. Department of Biotechnology, School of Bioengineering, SRM University, Kattankulathur, 603 203, Tamilnadu, India;1. Promising Centre for Sensors and Electronic Devices (PCSED) and Advanced Materials and Nano-Research Centre, Najran University, P.O. Box: 1988, Najran 11001, Saudi Arabia;2. Advanced Materials Department, Central Metallurgical R& D Institute, CMRDI, P.O. Box 87, Helwan 11421, Cairo, Egypt;3. Department of Physics, Faculty of Sciences and Arts, Najran University, P.O. Box 1988, Najran 11001, Saudi Arabia;4. Department of Chemistry, Faculty of Sciences and Arts, Najran University, P.O. Box 1988, Najran, 11001, Saudi Arabia;1. Department of Organic and Nano Engineering, Hanyang University, Seoul, 133-791, Republic of Korea;2. Department of Fuel Cells and Hydrogen Technology, Hanyang University, Seoul, 133-791, Republic of Korea |
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| Abstract: | Zinc-modified nanocrystalline SnO2 electrodes are prepared by chemical treatment of the commercial SnO2 colloid with zinc acetate and their thickness effects on photovoltaic characteristics are investigated. Open-circuit voltage (Voc) and fill factor increase with increasing zinc concentration, while short-circuit photocurrent (Jsc) decreases. The normalized incident photon-to-current conversion efficiency (IPCE) shows that increase of zinc concentration utilizes long wavelength light. Concerning the conversion efficiency, optimal concentration within the present experiment is found to be 10 mol.% Zn2+ with respect to Sn4+. As increasing thickness of the films based on 10 mol.% zinc-modified SnO2 ranging from 0.76 to 8.12 μm, Jsc increases, reaches maximum and then decreases without change in Voc. The highest conversion efficiency of about 3.4% is achieved under 1 sun of AM 1.5 irradiation for the ～6.3 μm-thick 10 mol.% zinc-modified SnO2 film with Jsc of 9.09 mA/cm2, Voc 600 mV and fill factor 62%. |
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