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Fabrication of CdSe sensitized SnO2 nanofiber quantum dot solar cells
Affiliation:1. School of Physics, Shandong University, Jinan 250100, PR China;2. Key Laboratory of Colloid and Interface Chemistry (Ministry of Education), Shandong University, Jinan 250100, PR China;1. Department of Applied Chemistry, School of Science, Northwestern Polytechnical University, Xi’an, Shaanxi 710129, PR China;2. Key Laboratory of Applied Surface and Colloid Chemistry, National Ministry of Education, Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi’an 710119, PR China;3. Integrated Composites Laboratory (ICL), Department of Chemical & Biomolecular Engineering, University of Tennessee, Knoxville, TN 37996, USA;1. Key Laboratory of Novel Thin Film Solar Cells, Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui 230031, PR China;2. Beijing Key Lab of Novel Thin Film Solar Cells, North China Electric Power University, Beijing 102206, PR China;3. Anhui Provincial Key Laboratory of Photonic Devices and Materials, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, PR China;1. Department of Materials Science and Chemical Engineering, Hanyang University, Ansan 15588, Korea;2. Department of Advanced Materials Engineering, Hanyang University, Ansan 15588, Korea;3. Department of Chemistry and Applied Chemistry, Hanyang University, Ansan 15588, Korea;4. Department of Bionano Technology, Hanyang University, Ansan 15588, Korea;5. Samsung Advanced Institute of Technology, Samsung Electronics, Ltd., Suwon 16678, Korea;1. Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India;2. Institute of Nano Science and Technology, Mohali, Punjab 160062, India;3. Department of Chemistry, Savitribai Phule Pune University, Ganeshkhind, Pune 411007, India;1. Department of Materials Science and Chemical Engineering, Hanyang University, Ansan, 15588, South Korea;2. Department of Materials Science and Engineering, Institute of Space Technology, Islamabad, 44000, Pakistan;3. Department of Advanced Materials Engineering, Hanyang University, Ansan, 15588, South Korea;4. Department of Chemical and Molecular Engineering, Hanyang University, Ansan, 15588, South Korea;5. Department of Bionano Technology, Hanyang University, Ansan, 15588, South Korea
Abstract:In the present study, we report a cost-effective quantum dot solar cells based on a combination of electrospinning and successive-ionic-layer-adsorption and reaction (SILAR) methods. CdSe nanocrystals are deposited on electrospun SnO2 nanofibers by SILAR method using CdCl2 as the cadmium source and Na2Se as selenium source. The as-prepared materials are characterized by spectroscopy and microscopy. CdSe deposited SnO2 electrodes are also characterized by spectroscopy and microscopy. Cells are fabricated with platinum (Pt)-sputtered FTO glasses used as the counter electrodes and polysulfide solution used as the electrolyte. The efficiency of the cells is studied for different number of SILAR cycles. Current density–voltage (JV) measurements on a cell having CdSe deposition of 7 SILAR cycles and SnO2 coating area 0.25 cm2 showed an overall power conversion efficiency of 0.29 % with a photocurrent density (JSC) of 5.32 mA cm−2 and open circuit voltage (VOC) of 0.23 V under standard 1 Sun illumination of 100 mWcm−2 (AM 1.5 G conditions). This is improved by carefully coating SnO2 film without losing the structures. Also ZnS passivation layer is coated to obtain an improved efficiency of 0.48% with JSC of 4.68 mAcm−2, and VOC of 0.43 V.
Keywords:Quantum dot solar cells (QDSC)  Successive-Ionic-Layer Adsorption and Reaction (SILAR)  Electrospinning  Tin oxide nanofibers  Cadmium selenide (CdSe)
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