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Dead space effect on the wavelength dependence of gain and noise in avalanche photodiodes

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3 Author(s)
Pauchard, A.R. ; Inst. of Microsyst., Swiss Fed. Inst. of Technol., Lausanne, Switzerland ; Besse, Pierre-A. ; Popovic, R.S.

We extend the dead space model proposed by Hayat et al. in order to determine the wavelength-dependent multiplication mean gain ⟨G(λ)⟩ and excess noise factor F(λ) in the case of mixed electron and hole injection, as it is the case when photons are absorbed within the multiplication region. We compare the predictions of the model with measurements performed on a silicon ultraviolet-selective avalanche photodiode with submicron thick multiplication region. We show that the multiplication gain is constant in the visible and near-infrared part of the spectrum, and increases in the UV range by a factor of 1.8. Furthermore, the excess noise factor is minimal for UV radiation and increases rapidly for longer wavelengths. It appears that the extended dead space model is very adequate at predicting the gain and noise measurement results. In order to unambiguously determine the effect of the dead space, we compare the predictions of our model with those of McIntyre's local noise model. The latter qualitatively describes the wavelength dependence of the gain, but greatly overestimates the excess noise factor

Published in:

Electron Devices, IEEE Transactions on  (Volume:47 ,  Issue: 9 )

Date of Publication:

Sep 2000

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