Title :
Current matched GaAsP/SiGe tandem device on Si over 20% efficiency under indoor measurement
Author :
Li Wang;Brianna Conrad;Anastasia Soeriyadi;Martin Diaz; Xin Zhao; Dun Li;Anthony Lochtefeld;Andrew Gerger;Chris Ebert;Ivan Perez-Wurfl;Allen Barnett
Author_Institution :
School of Photovoltaic and Renewable Energy Engineering, UNSW Australia, Sydney, 2052, Australia
fDate :
6/1/2015 12:00:00 AM
Abstract :
Lattice matched and current matched GaAsP/SiGe tandem solar cell on Si has the potential of 40% efficiency. This paper describes our design, fabrication and improvement of this tandem solar cell. This tandem device has achieved efficiencies of 20.6% and 20.2% under 1X and 2.2X, respectively. Current matching between top cell and bottom cell is realized by manipulating the bottom cell active area and lamp spectrum during JV measurements. Improving the optics and cell structure should lead to current matching in this tandem device and produce an efficiency over 25% and over 30% under 1X and 20X standard AM1.5G, respectively.
Keywords :
"Photovoltaic cells","Silicon","Silicon germanium","Substrates","Current measurement","Lighting","Lattices"
Conference_Titel :
Photovoltaic Specialist Conference (PVSC), 2015 IEEE 42nd
DOI :
10.1109/PVSC.2015.7355599
