Low Reflectivity Solar Cells.
Final rept. 31 May 74-4 Jan 76,
SPECTROLAB INC SYLMAR CALIF
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Techniques for both reducing and changing specular reflectance from silicon solar cell assemblies cell and cover were developed. Mechanical and chemical treatments of quartz cell covers yielded surfaces that acted like nearly perfect diffusers of incoming visible radiation. A four order of magnitude reduction in specular reflectivity was achieved in this manner. Selective etches and multiple antireflection AR coatings were used to reduce the total reflection from the cell. Etches such as sodium and potassium hydroxide reduced the total reflection over the entire silicon cell spectrum 350-1100 nm to below one percent, with a corresponding increase in output current of nearly eight percent over conventionally prepared surfaces. Some degradation in fill factor was observed with the etched surface so that the current increase at the load voltage was somewhat less than at short circuit.
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