Generation Recombination Noise in GaN Photoconducting Detectors
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=
I0 exp (-t
)
G 7.8 Mat. Res. Soc. Symp. Proc. Vol. 537 ©1999 Materials Research Society
The time constant t is a characteristic of the deep level and is related to its emission ('Ce)and capture (,r,) time constants according to the relation12 1
1
1
(2)
Te Tc When the noise arises from deep levels with a well-defined time constant the observed noise spectrum has a Lorentzian shape which can be described as T
i2
=
t+
AA*Af
•f0)2]
(3)
where f0 = 1/27-ct is the characteristic frequency associated with the time constant - and A is the
amplitude of the noise current at frequencies f
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