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Unassisted Water Splitting Using Standard Silicon Solar Cells Stabilized with Copper and Bi-functional NiFe Electrocatalysts
摘要： Silicon photovoltaic cells functionalized with water splitting electro-catalysts are promising candidates for unassisted water splitting. In these devices, the total surface of silicon solar cell is covered with electrocatalyst causing issues with i) stabilizing silicon solar cell in water and ii) device efficiency due to parasitic optical absorption in electrocatalyst. We describe and validate a water splitting device concept using a crystalline silicon solar cell where the front-side is covered with insulating Si3N5 antireflection coating. The Ag contacts, fired through the antireflection coating, are removed and subsequently substituted with NiFe layered double hydroxide (LDH) or Cu/NiFe-LDH electrocatlysts. In this device only the site of Ag contacts, nearly 2% of total device area is covered by the electrocatalyst. We found this small area of catalyst does not limit device performance and addition of a Cu interlayer between Si and NiFe-LDH improves device performance and stability. The unassisted water splitting efficiency of 11.31%, measured without separating the evolved gases, is achieved using a device composed of three series-connected silicon solar cells and a NiFe-LDH/Cu/Ni-foam counter electrode in a highly alkaline electrolyte.
关键词： NiFe layered double hydroxides,Photoelectrochemical Cells,Unassisted Water Splitting,Crystalline Silicon Solar Cell,Si Photocathodes
更新于2025-09-23 15:19:57
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[IEEE 2018 2nd IEEE International Conference on Power Electronics, Intelligent Control and Energy Systems (ICPEICES) - Delhi, India (2018.10.22-2018.10.24)] 2018 2nd IEEE International Conference on Power Electronics, Intelligent Control and Energy Systems (ICPEICES) - Development of a Characterization Tool for Determination of Sheet Resistance at 9 Places of Large Area 156 mm by 156 mm Diffused Silicon Wafer in Less than 5 Seconds and Its Application in Making High Efficiency Silicon Solar Cells
摘要： Sheet resistance measurement using 4 probe method is a very well established technique for measuring the sheet resistance of a thin film on a substrate. This technique is widely used to measure the sheet resistance of diffused silicon wafer in solar photovoltaic industry. However with respect to solar cell industry, the drawback associated with this technique is, it measures the sheet resistance of a very small area. For a large area silicon wafer of size 156 mm by 156 mm, a four probe sheet resistance measurement instrument will take several minutes to take readings at several places on the entire area of the wafer. In the present work a solar cell characterization tool is developed for measuring the sheet resistance at 9 places on a diffused silicon wafer using 9 four probe heads mounted on a single plate. The characterization tool developed in the present work can tell the uniformity of diffusion in a diffused silicon wafer within few seconds on the screen of a computer monitor. Continuous data logging helps in characterizing wafers which are >50,000/day in any smallest PV industry.
关键词： Sheet Resistance,crystalline silicon solar cell,Four probe technique,Shallow emitter
更新于2025-09-11 14:15:04