Fig. 1From: Enhanced Photovoltaic Performance of Dye-Sensitized Solar Cells by Efficient Near-Infrared Sunlight Harvesting using Upconverting Y2O3:Er3+/Yb3+ Phosphor Nanoparticles a XRD (red solid line) pattern. b TEM image. c HR-TEM image. d SAED pattern. e STEM image of Y2O3:Er3+/Yb3+ nanoparticles. f elemental mapping of Y, O, Er, and YbBack to article page