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On the alignment tolerance of photovoltaic laser power converters

: Wagner, L.; Bett, A.W.; Helmers, H.


Optik 131 (2017), pp.287-291
ISSN: 0030-4026
Journal Article
Fraunhofer ISE ()
Materialien - Solarzellen und Technologie; Photovoltaik; III-V und Konzentrator-Photovoltaik; Power-by-Light; current matching; power converter; losses; series connection; Power-by-Light

This work addresses the alignment of a light spot onto photovoltaic laser power converters for power-by-light applications. A model to compare the alignment tolerances of different cell designs by means of the maximum acceptable misalignment is introduced. Monolithic interconnected multi-segment cells, which are commonly used as high-voltage devices, suffer from poor current matching for misaligned light spots. We show that the maximum acceptable misalignment of circular pie-shaped high-voltage devices decreases quickly with increasing number of series connected segments. A lower limit for the precision of the alignment procedure is only 5.1% of the cell radius. This precision requirement is three times higher than for single-segment cells (15.7%).