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What is the mechanism behind the effect of rear irradiance on multijunction solar cells?

Solar irradiance

Radiative transfer

Potential induced degradation

Degradation (telecommunications)

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The mechanism behind the effect of rear irradiance on multijunction solar cells involves various factors. Rear-side irradiance impacts carrier generation rates, recombination rates, and series resistance, influencing cell performance. In the case of silicon heterojunction cells, rear-side degradation is linked to sodium diffusion triggered by humidity and low encapsulant resistivity, affecting fill factor. Additionally, inverted GaInP junctions exhibit reduced nonradiative recombination with a rear-heterojunction design, leading to higher subcell voltage and improved performance in multijunction solar cells. Moreover, the spectrum of irradiance on the rear of modules affects backsheets' degradation, with UV damage acceleration factors potentially underestimated by up to 4.5%. These findings highlight the intricate interplay between rear irradiance and various performance parameters in multijunction solar cells.

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Open access•Journal Article•DOI Implications of Redesigned, High-Radiative-Efficiency GaInP Junctions on III-V Multijunction Concentrator Solar Cells John F. Geisz, Myles A. Steiner, Iván García, Daniel J. Friedman, Sarah Kurtz - Show less +4 more 01 Jan 2015-IEEE Journal of Photovoltaics 18 Citations	Rear-heterojunction design in GaInP junctions reduces nonradiative recombination, leading to higher subcell voltage and improved luminescence coupling in multijunction solar cells, enhancing overall performance.
Proceedings Article•DOI Study of Carrier Transport in Bifacial Silicon Heterojunction Solar Cells Under High Air Mass Illumination Erin M. Tonita, Christopher E. Valdivia, Karin Hinzer - Show less +2 more 14 Jun 2020 1 Citations	Rear irradiance in bifacial solar cells affects carrier generation, recombination rates, and series resistance, impacting performance. Recombination rates are higher for rear illumination, influencing efficiency and parasitic absorption.
Proceedings Article•DOI Spectral rear irradiance testing and modeling for degradation and performance of solar fields Silvana Ovaitt, Matthew Brown, Chris Deline, Michael D. Kempe - Show less +3 more 05 Jun 2022	Not addressed in the paper.
Proceedings Article•DOI Potential Induced Degradation Mechanism in Rear-Emitter Bifacial Silicon Heterojunction Solar Cells Encapsulated in Different Module Structures Olatz Arriaga Arruti, Luca Gnocchi, Quentin Jeangros, Alessandro Virtuani, Christophe Ballif - Show less +4 more 20 Jun 2021 2 Citations	Not addressed in the paper.
Proceedings Article•DOI Spectral rear irradiance testing and modeling for degradation and performance of solar fields 05 Jun 2022	Not addressed in the paper.

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