Bifacial photovoltaic cells, modules, and systems are rapidly overtaking the market share of monofacial PV technologies. This is happening due to new cell designs that have replaced opaque, monolithic back surface foil contacts with isolated contacts, which allow light to reach the cell from the rear side. Minor adjustments to cell processing steps have resulted in bifacial solar cells with rear side efficiencies from >60% to over 90% of the front side efficiency. Bifacial cells now come in many varieties (e.g., PERC+, n-PERT, HIT, etc.) and many cell lines have converted to producing bifacial cells.
IEA PVPS Task 13 Report: Bifacial Photovoltaic Modules and Systems
This IEA PVPS Task 13 report provides an overview of bifacial PV technology, its benefits and challenges, as well as regional descriptions of R&D being done to better understand this technology.