Determination of subcell I-V parameters by a pulsed suns-Voc method including optical coupling
Abstract
The open circuit voltage of a single subcell in a multijunction cell stack can be measured with the help of pulsed, millisecond illumination. This concept makes use of the fact that the charging of the non-illuminated cell capacitances takes place on a much longer timescale than of the illuminated one. Optical coupling introduces a photocurrent in the subcell underneath. Its efficiency can be quantified in parallel under short circuit conditions. A suns-Voc approach, applied to this subcell pair, yields all relevant diode parameters. Applied to all subcells of a GaInP/GaInAs/Ge triple junction cell, a very good match to the dark I-V curve is obtained.
URI
http://dx.doi.org/10.1063/1.4906237http://aip.scitation.org/doi/abs/10.1063/1.4906237?journalCode=apl
http://hdl.handle.net/10863/4281