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III-V//CuxIn1-yGaySe2 Multijunction Solar Cells with 27.2% Efficiency Fabricated using Modified Smart Stack Technology with Pd Nanoparticle Array and Adhesive Material

 
: Makita, K.; Kamikawa, Y.; Mizuno, H.; Oshima, R.; Shoji, Y.; Ishizuka, S.; Müller, R.; Beutel, P.; Lackner, D.; Benick, J.; Hermle, M.; Dimroth, F.; Sugaya, T.

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Progress in Photovoltaics 29 (2021), No.8, pp.887-898
ISSN: 1062-7995
ISSN: 1099-159X
English
Journal Article
Fraunhofer ISE ()
Photovoltaik; bonding technology; CuxIn1-yGaySe2 solar cells; III-V solar cells; mechanical stack; multijunction solar cells; III-V- und Konzentrator-Photovoltaik; III-V Epitaxie und Solarzellen

Abstract
Multijunction (MJ) solar cells achieve high efficiencies by effectively utilizing the solar spectrum. Previously, we have developed III-V MJ solar cells using smart stack technology, a mechanical stacking technology that uses a Pd nanoparticle array. In this study, we fabricated an InGaP/AlGaAs//CuxIn1−yGaySe2 three-junction solar cell by applying modified smart stack technology with a Pd nanoparticle array and adhesive material. Using adhesive material (silicone adhesive), the bonding stability was improved conspicuously. The total efficiency achieved was 27.2% under AM 1.5 G solar spectrum illumination, which is a better performance compared to our previous result (24.2%) for a two-terminal solar cell. The performance was achieved by optimizing the structure of the upper GaAs-based cell and by using a CuxIn1−yGaySe2 solar cell with a specialized performance for an MJ configuration. In addition, we assessed the reliability of the InGaP/AlGaAs//CuxIn1−yGaySe2 three-junction solar cell through a heat cycle test (from −40°C to +85°C; 50 cycles) and were able to confirm that our solar cells show high resistivity under severe conditions. The results demonstrate the potential of III-V//CuxIn1−yGaySe2 MJ solar cells as next-generation photovoltaic cells for applications such as vehicle-integrated photovoltaics; they also demonstrate the effectiveness of modified smart stack technology in fabricating MJ cells.

: http://publica.fraunhofer.de/documents/N-635468.html