The image of etch pits for a bulk crystal of InSb from optical microscope gives estimation of defect density in the range 10^5 /cm^2 whereas calculation of defect density using relation Ns proportional to integration of alpha*dE gives much higher value. (In the range 10^18/ m^3) The proportionality constant itself is 10^18. Can anybody tell what is going wrong?
Manisha Deepak Joshi Deshpande
I realised that absrption coefficient term in the formula for defect density has two parts. One from absorption due to high carrier conc and the other part is due to defects. So if we consider only second part then the answer is about 10 times higher than etch pit density caculated from image.
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