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EVALUATION OF SOLAR CELL J(V)-MEASUREMENTS WITH A DISTRIBUTED SERIES RESISTANCE MODEL

Least square fits of J(V)-curves to the double diode model often result in different parameters for the illuminated and dark characteristics which are not compatible with the JSC-VOC curve, especially for non optimum solar cells in the development stage. When using a one-dimensional distributed series resistance model the illuminated, dark J(V) and JSC-VOC characteristics of many of our solar cells can be well described with a consistent set of parameters, i.e. no light dependent parameters for series resistances and diodes need to be assumed. Rather then fitting all parameters to a single curve, we extract the parameters RSH, J01, J02 and the n-factors from the dark J(V)-curve and the JSC-VOC curve, respectively. The illuminated curve then provides sufficient information to separate two contributions to the series resistance. In addition to the series resistance RS, a parameter RCC (in Ωcm2, CC for current crowding) is used to describe the distributed character of a J(V) curve independently from the cell geometry. The interpretation of the fitted resistance values are discussed as well as the tendency towards wrong results when distributed cell characteristics are fitted to the ordinary double diode model.