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A first few curves showing the
relation of the minority carrier life time and point defects More to come in due time |
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Shown below is the life time as a function of the
doping (or resistivity) for otherwise perfect crystal. This is the ultimate
life time achievable - it can only get worse if crystal defects are added. |
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Gold - an interstitial impurity atom in Si - is known to be a potent "life time killer" like many heavy metals. This is the reason why jewelry, watches, make-up (often containing heavy metals) are absolutely forbidden in clean rooms. | ||
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The curve below shows that minute amounts are sufficient to degrade the life time far below the level dictated by doping alone. | ||
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2.2.3 Life Time and Diffusion Length
2.3.3. Shockley-Read-Hall Recombination
© H. Föll
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