Title :
Roadmap towards efficiencies over 40% at ultra-high concentrations (> 1000 suns)
Author :
Barrigon, E. ; Rey-Stolle, I. ; García, I. ; Algora, C.
Author_Institution :
Inst. de Energia Solar, Univ. Politec. de Madrid, Madrid, Spain
Abstract :
High efficiency solar cells working under ultra-high concentrations (>;1000X) have been shown to be a promising solution to decrease the cost of PV electricity, increase the efficiency and circumvent the material availability restrictions for massive PV penetration. A detailed analysis of the limitations of our current triple junction solar cell (36.2% at 700X), in the quest to maximize efficiency at 1000X, shows that the main improvements to tackle are: a) implementation of a high band gap tunnel junction; b) increase the band gap of the top cell; c) fine current matching tune; d) enhancement of the front contact process. This constitutes our roadmap to reach an efficiency over 41%.
Keywords :
energy gap; photovoltaic power systems; solar cells; PV electricity; current triple junction solar cell; fine current matching tune; front contact; high band gap; high efficiency solar cells; massive PV penetration; tunnel junction; ultra-high concentrations; Junctions; Photonic band gap; Photovoltaic cells; Photovoltaic systems; Resistance; Sun;
Conference_Titel :
Photovoltaic Specialists Conference (PVSC), 2011 37th IEEE
Conference_Location :
Seattle, WA
Print_ISBN :
978-1-4244-9966-3
DOI :
10.1109/PVSC.2011.6186068
