Abstract
Four-junction GaInP/GaAs/GaInNAs/Ge solar cells are a widely-pursued route toward AMO efficiencies of 35% and above, and terrestrial efficiencies of up to 40%. Extensive research into the new material system of GaInNAs has so far yielded subcells with AMO current densities far below the ∼17 mA/cm2 needed to current match the other subcells in the stack. A new multijunction structure, a 5-junction GaInP/GaInP/GaAs/GaInNAs/Ge cell, divides the solar spectrum more finely in order to relax this current matching requirement, by using an optically thin, high-bandgap Gainp top subcell, with an additional thick, low-bandgap Gainp subcell beneath it, in combination with a GaInNAs subcell. In this way, the 5-junction cell design allows the practical use of GaInNAs subcells to increase the efficiency of multijunction cells. Light I-V and external quantum efficiency measurements of the component subcells of such 5-junction cells are discussed. Experimental results are presented for the first time on GaInP/GaInP/GaAs/GaInNAs/Ge cells with the top four junctions active, with measured Voc of 3.90 V.
Original language | English (US) |
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Title of host publication | Conference Record of the IEEE Photovoltaic Specialists Conference |
Pages | 852-855 |
Number of pages | 4 |
State | Published - 2002 |
Externally published | Yes |
Event | 29th IEEE Photovoltaic Specialists Conference - New Orleans, LA, United States Duration: May 19 2002 → May 24 2002 |
Other
Other | 29th IEEE Photovoltaic Specialists Conference |
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Country/Territory | United States |
City | New Orleans, LA |
Period | 5/19/02 → 5/24/02 |
ASJC Scopus subject areas
- Control and Systems Engineering
- Condensed Matter Physics