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Measurement precaution for concentrator MJ solar cell modules

pubblicazioni - Articolo

Measurement precaution for concentrator MJ solar cell modules

AG A frequency response analysis of multijunction (MJ) concentrator modules has been carried out and compared with the frequency response analysis of single junction (SJ) concentration modules, considering different module cells connection scheme.

It has been found that the current time response of the module to voltage step variation is mainly dependent on module cell layout and less dependent on the cell type. Module response time of few microsecond limits the number of I-V points to be acquired during the short duration of the flash simulator. Measurement precaution were identified in relation to the dark IV test considered in the IEC 62108 normative. We found that during this test, shunts effects can be induced by current polarisation, in relation to the particular cell connection scheme adopted in the module. Further, negative resistance behaviour on the CPV module IV curve over a certain current threshold was detected. CPV module electroluminescence and a detailed I-V characterisation of the receivers and cells have been carried out in order to explain the shunts effects and the I-V curve behaviour. Keywords: III-V Semiconductors, Gallium Arsenide Based cells, Multijunction Solar Cells, Concentrator modules, Characterisation, Testing, Qualification.

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