Surface and Volume Decay Times of Photoconductivity in n-Type Silicon Wafers
2007
Two photoconductive decay times in the surface and volume regions of silicon wafers can be separately derived from the microwave-detected photoconductive decay signals assuming two independent exponential functions for the annihilation of excess carriers. The surface decay times vary from 60 to 30 µs when an n-type silicon wafer rinsed with a hydrofluoric acid solution is kept exposed to the air, while the volume decay times of around 2.5 µs thus obtained are constant, as theoretically expected.
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