Size effects on generation recombination noise

TL;DR

This paper presents an analytical theory of generation-recombination noise in resistors, highlighting how finite size effects and Coulomb interactions lead to saturation of current fluctuations at high voltages.

Contribution

It introduces a comprehensive analytical model that includes space charge fluctuations and diffusion current, extending previous theories on generation-recombination noise.

Findings

Finite size effects cause saturation of current spectral density at high voltages.

Long-range Coulomb interactions significantly influence noise saturation.

Saturation of current fluctuations is a general feature at high voltage bias.

Abstract

We carry out an analytical theory of generation-recombination noise for a two level resistor model which goes beyond those presently available by including the effects of both space charge fluctuations and diffusion current. Finite size effects are found responsible for the saturation of the low frequency current spectral density at high enough applied voltages. The saturation behaviour is controlled essentially by the correlations coming from the long range Coulomb interaction. It is suggested that the saturation of the current fluctuations for high voltage bias constitutes a general feature of generation-recombination noise.