The tests were done at DOE’s National Renewable Energy Laboratory (NREL) in Golden, Colorado.
Separately, Global Solar says its CIGS solar cell strings manufactured at plants in Germany and the US achieved peak efficiency of 11.7% for production.
Global Solar, based in Tucson, Arizona, claims to be the only manufacturer of CIGS cells on a flexible substrate in full-scale production.
Harin S. Ullal, an official at NREL’s National Center for Photovoltaics, called 15.45%
