Applied Physics Letters · 1984 · 52 citations · 7 references
EngineeringElectrical EngineeringMaterials ScienceOptoelectronicsSemiconductor DevicesSemiconductor MaterialsPhotovoltaic DevicesPhotovoltaic MaterialsSolar Cell MaterialsSolar CellsSolar Energy SystemsSolar Photovoltaic SystemsDiode ModelingHeterojunction Solar CellsPhotovoltaic Performance AnalysisPhotovoltaic SystemsSolar Cell CharacterizationSolar Cell Device PhysicsSuperposition PrincipleSuperposition Principle Analysis
Chopped beam measurements on CuInSe2/Cd(Zn)S solar cells have revealed a failure of the superposition principle, with the light-generated current showing a strong voltage dependence. The light I-V curve can be fully explained with no change in the diode current. The voltage-dependent light-generated current dominates the light I-V curve below Voc, requiring that the analysis of all the traditional solar cell characterization measurements be modified. We have derived the general expressions needed to obtain the diode factor from the light I-V and Voc versus intensity curves. We have also shown how the temperature variation of Voc is affected.
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