3.3 Intensity Modulation Current
Transfer Function
At each modulating frequency, we
measure AC output voltage across the load
and AC light intensity incident upon the cell
using a calibrated diode detector. To obtain a
photocurrent needed in the transfer
impedance calculation, we undertake the
followings
(a) finding a conversion factor between
the short circuit currents of the solar cell
and the diode detector under the same
incident light.
(b) assuming that the short circuit
currents of the solar cell and the diode
detector vary linearly with the incident light
intensity.
(c) we compensate the effects of a finite
shunt resistance (6.40 Ω ) and non-zero
series resistance (0.03 Ω) so that short
circuit current of solar cell differs from the
photocurrent. This compensation allows us
to deduce the photocurrent from the short
circuit current