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Spectral and temperature sensitivity of area de-coupled tandem modules

Strandberg, Rune
Chapter, Peer reviewed
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http://hdl.handle.net/11250/2372811
Issue date
2015
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  • Scientific Publications in Engineering [277]
  • Publikasjoner fra CRIStin [587]
Abstract
Area de-coupling is a recently suggested method

for current- or voltage-matching two-terminal tandem modules.

It has previously been shown that under standard conditions,

area de-coupled modules have the same theoretical efficiency

as four-terminal tandem cells for any combinations of band

gaps. In this work, the spectral and temperature sensitivity of

ideal area de-coupled modules is investigated by detailed balance

modeling. Voltage-matched area de-coupled modules are found

to be considerably less sensitive to changes in the spectrum than

current-matched modules. Current-matched modules are, on the

other hand, found to be less sensitive to changes in the temperature.

Under normal conditions, the difference in temperature

sensitivity has a negligible impact on the efficiency compared

to the difference in spectral sensitivity, making voltage-matched

modules the preferred choice. The difference in efficiency between

an area de-coupled voltage-matched module and a four-terminal

device is found to be too small to be of any practical consequence

even under changing conditions. This finding is in agreement

with earlier work by Lentine et al. on microsystem-enabled

photovoltaic modules.

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