High efficiency bifacial back surface field solar cells

Abstract

The first high efficiency p+-n-n+ bifacial solar cells are presented. Efficiencies of 15.7% and 13.6% were measured under front and back air mass one illumination respectively at 28°C. At 7 air mass one illumination and 28°C the front efficiency increases to 16.5%. A pilot production of 200 cells was made following a fabrication process as simple as that for conventional back surface field cells. Mean efficiencies of 13.4% and 10.7% were obtained under front and back illumination respectively. The production yield is higher than 80%. Show more