The upconversion nanorods can preferentially harvest the IR solar photons, followed by the absorption of emitted high - energy photons to generate extra photocurrent in solar cells. (sciencedaily.com)
Firstly, it produces under sun light illumination a photovoltage of almost 0.5 volts and very high photocurrent densities of up to 38 mA / cm2; secondly, it acts as a catalyst to accelerate the formation of hydrogen, and finally, it is chemically protected against corrosion as well. (sciencedaily.com)
Since TiO2 is transparent, almost all sun light reaches the photoactive chalcopyrite, leading to the observed high photocurrent density and photovoltage comparable with those of a conventional device - grade thin - film solar cell. (sciencedaily.com)