Ag2Se quantum-dot sensitized solar cells for full solar spectrum light harvesting

► The external quantum efficiency spectrum covers the entire solar power spectrum. ► The photovoltaic range is ∼7-14 times broader than that of CdS and CdSe. ► The photocurrent that Ag2Se generates is four times higher than that of N3 dye. ► The best Ag2Se cell yields an efficiency of 3.12% under 9.7% sun. ► The first demonstration of solar cells sensitized with Ag2Se quantum dots.