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Over 35% efficient GaAs/GaSb stacked concentrator cell assemblies for terrestrial applications

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8 Author(s)
Fraas, L. ; Boeing High Technol. Center, Seattle, WA, USA ; Avery, J. ; Sundaram, V.S. ; Dinh, V.T.
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It has been previously noted that GaSb infrared-sensitive cells can be stacked behind transparent GaAs cells to boost solar cell energy conversion efficiencies to well over 30% for space and terrestrial applications. Verified spectral response and current versus voltage data for both GaAs and GaSb cells along with Sandia National Laboratories clear-day solar spectral data for Albuquerque, US, are used to calculate the stack performance for various spring, summer, fall, and winter days in Albuquerque at both 25°C and at projected cell normal operating temperatures (NOT). It is found that the stack annual average energy conversion efficiency is 35.6% at 25°C and 32.5% at NOT. During the year, the tandem stack efficiency at 25°C varies by a small amount, from a low of 35.3% to a high of 35.8%

Published in:

Photovoltaic Specialists Conference, 1990., Conference Record of the Twenty First IEEE

Date of Conference:

21-25 May 1990