N. Bordin et al., The use of the self-calibration method for accurate determination of silicon solar cell internal quantum efficiency, SOL EN MAT, 63(3), 2000, pp. 247-257
The application of the self-calibration method as a means of increasing the
accuracy of spectral response, SR, and internal quantum efficiency, Q(lamb
da), measurements is discussed. The principle of the method is the precise
calculation of Q(lambda(m)) of a test cell for light at lambda(m) approxima
te to 0.8 mu m, where the response is weakly dependent on the emitter and b
ase parameters. The ratio of the calculated and measured Q(lambda(m)) value
s gives the corresponding factor for shifting the experimental spectral res
ponse curve. The sequence of calculations is described, and an algorithm of
the necessary operations for a computer is developed. Several examples of
the use of the self-calibration method for correction of SR measurements of
solar cells with low shunt resistance demonstrate its very high effectiven
ess. The corrected Q(lambda) values follow the respective actual data with
very high accuracy even when the measured SR is decreased by factor 2-3 due
to low shunt resistance of the solar cell. (C) 2000 Elsevier Science B.V.
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