Determination of space charge region width and diffusion length in Cu(In,Ga)(S,Se)2 absorber from solar cell spectral characteristics (original) (raw)
In this work we present simple non-destructive method for extracting of Cu(In,Ga)(S,Se)2-based solar cell parameters (space-charge region width and diffusion length of minority charge carriers in Cu(In,Ga)(S,Se)2 absorber) from the analysis of solar cell spectral characteristics. This method is based on one-dimensional model of a solar cell when the change of in-depth distribution of the photogenerated carriers and, hence, the change of its photoresponse with the variation of excitation wave-length in solar cell is taking into account. The following assumptions are accepted: the reflection of charge carriers from back contact and the «drawing» fields in the quasi-neutral area of the absorber layers are negligible; window and buffer layers are transparent in the analyzed of spectrum range; the injection level of minority charge carriers is low; the recombination losses at the metallurgical p-n-junction interface of the studied photosensitive structure are dependent linearly on the ph...
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