California solar technology manufacturer Alta solar has achieved a conversion efficiency of 29.1 % with its gallium arsenide cell , beating its previous record of 28.9 % announced in June . solar 's cells are also being tested by NASA on the International Space Station after the company , a Hanergy Group subsidiary , was selected to be part of November 's Materials International Space solar cell flight investigation . The cells will be returned to NASA and Alta in a month 's time for evaluation .
California solar technology manufacturer Alta Devices has achieved a conversion efficiency of 29.1% with its gallium arsenide cell, beating its previous record of 28.9% announced in June. Alta's cells are also being tested by NASA on the International Space Station after the company, a Hanergy Group subsidiary, was selected to be part of November's Materials International Space Station Experiment flight investigation. The cells will be returned to NASA and Alta in a year's time for evaluation.