High Field Effects
- For the small electric fields, the drift current increases linearly with electric field, as σ is a constant.
- However, for the large electric fields (typically > 103 V/cm), the current begins to show a sublinear dependence on electric field and eventually saturates for high fields.
- Hence, becomes a function of electric field, and this is called as the hot carrier effect, when the carrier drift velocity becomes comparable to the thermal velocity of it.
- The maximum carrier drift velocity is restricted to its mean thermal velocity (typically 107 cm/sec), beyond which the added energy imparted by electric field is absorbed by lattice (hence generating heat) instead of a corresponding increase in the drift velocity.
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