Title :
Temperature coefficients of concentrator solar cells up to ultra-high irradiance
Author :
Braun, Avi ; Hirsch, Baruch ; Vossier, Alexis ; Katz, Eugene A. ; Gordon, Jeffrey M.
Author_Institution :
Dept. of Solar Energy & Environ. Phys., Ben-Gurion Univ. of the Negev, Beer-Sheva, Israel
Abstract :
A flash-like, real-sun optical system has been used to experimentally measure the effect of irradiance (from 11 up to 8,600 suns) on the temperature coefficients of the key performance parameters of multijunction concentrator solar cells. Particular attention is paid to the time scales and magnitudes of junction heating, hence the degree to which the cell can be deemed isothermal, with implications for corresponding measurements from solar simulators with pulsed artificial light, and for the performance evaluation of concentrator photovoltaics. The theoretical bound for the magnitude of the temperature coefficient of Voc (as function of irradiance) has also been calculated for current commercial triple-junction structures.
Keywords :
solar cells; solar energy concentrators; concentrator photovoltaics; junction heating; multijunction concentrator solar cells; pulsed artificial light; real-sun optical system; solar simulators; temperature coefficient; triple-junction structures; ultra-high irradiance effect; Junctions; Photovoltaic cells; Photovoltaic systems; Sun; Temperature distribution; Temperature measurement; high irradiance; multijunction; solar simulators; temperature;
Conference_Titel :
Photovoltaic Specialists Conference (PVSC), 2012 38th IEEE
Conference_Location :
Austin, TX
Print_ISBN :
978-1-4673-0064-3
DOI :
10.1109/PVSC.2012.6317920