Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2002-10-22
Physics
Condensed Matter
Statistical Mechanics
10 pages, 8 figures. Accepted for publication in Journal of Applied Physics (Scheduled 1 January 2003)
Scientific paper
10.1063/1.1525863
We carry out a self-consistent analytical theory of unipolar current and noise properties of metal-semiconductor-metal structures made of highly resistive semiconductors in the presence of an applied bias of arbitrary strength. By including the effects of the diffusion current we succeed to study the whole range of carrier injection conditions going from low level injection, where the structure behaves as a linear resistor, to high level injection, where the structure behaves as a space charge limited diode. We show that these structures display shot noise at the highest voltages. Remarkably the crossover from Nyquist noise to shot noise exhibits a complicate behavior with increasing current where an initial square root dependence (double thermal noise) is followed by a cubic power law.
Cantalapiedra I. R.
Gomila Gabriel
Reggiani Letizia
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