The Fabrication of Crystalline Silicon Solar Cells
Exploring Surface Texturing Techniques
The fabrication of a conventional crystalline silicon solar cell involves multiple complex methods and techniques that requires a lot of patience, accurate measurements and careful handling. This includes the standard cleaning methodology, pyramid surface etching, spin-coating, mask applications, chemical vapor deposition and more. The cell examined was fabricated on a 2-inch silicon wafer containing 4 individually diced sub-cells. The conversional efficiency of each cell was tested to determine the ratio of output electrical power to input solar power, this resulted in an average efficiency of 2.49 ± 0.02%. Comparing this to the industry standard of 18-22%, the results differ by a factor of nearly 101. There are many factors that may have affected these results, most noticeable would be the poor surface texturing and contact resistance. Therefore, surface texturing techniques will be further investigated and optimized to show reflectance values of less than 5% and an increase of up to 5.8% in photocurrent such that efficiency values of greater than 20% could be achieved in such a laboratory setting.
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