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Multi-junction cell PV


Technology Description

Multi-junction cell design involves superposing several cells in a stack. In the case of two cells, it will form a double junction, also called a tandem cell. Stacking more cells together forms a triple or a quadruple junction. In all cases, the upper cell(s) must be as transparent as possible to enable the lower cells to still be active. This approach enables a broader spectrum of sunlight to be captured, and overall efficiency to be increased. III-V multi-junction cells using elements in the III and V columns of the periodic table, such as gallium indium phosphate (GaInP), gallium indium arsenide (GaInAs), and gallium arsenide (GaAs), are often used for concentrated PV applications.

Relevance for Net Zero

Commercially available, but has relatively low market penetration today, confined to niche applications (e.g. space flight).

Key Countries

Germany, United States, France, Japan, Spain

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