83results about How to "High solar efficiency" patented technology

A method and device that incorporates metallic nanoparticles at the p+-n+ tunnel junction in a cascaded photovoltaic solar cell. The use of the nanoparticles enhances the tunneling current density through the tunnel junction. As such, the efficiency of the solar cell is increased. A method in accordance with the present invention comprises making a first solar cell having a first bandgap, making a tunnel junction coupled to the first solar cell, and making a second solar cell having a second bandgap, coupled to the tunnel junction opposite the first solar cell, wherein the tunnel junction comprises nanoparticles. Such a method further optionally includes the nanoparticles being a metal or a semi metal, specifically a semi-metal of erbium arsenide, the nanoparticles being deposited in an island structure within the tunnel junction, and the first solar cell being deposited on a flexible substrate. A device in accordance with the present invention comprises a tunnel junction, wherein the tunnel junction comprises nanoparticles between the n+ layer and the p+ layer of the tunnel junction. Such a device further optionally includes the device being a cascaded solar cell, the nanoparticles are a metal or semi-metal, specifically a semi-metal of erbium arsenide, and the device is fabricated on a flexible substrate.

Methods for selectively diffusing dopants into a substrate wafer are provided. A liquid precursor is doped with dopants. The liquid precursor is selected from a group comprising monomers, polymers, and oligomers of silicon and hydrogen. The doped liquid precursor is deposited on a surface of the substrate wafer to create a doped film. The doped film is heated on the substrate wafer for diffusing the dopants from the doped film into the substrate wafer at different diffusion rates to create a heavily diffused region and a lightly diffused region in the substrate wafer. The method disclosed herein further comprises selective curing of the doped film on the surface of the substrate wafer. The selectively cured doped film acts as a diffusion source for selectively diffusing the dopants into the substrate wafer.

A method for fabricating a counter electrode for a dye-sensitized solar cell includes co-sputtering platinum and a metal oxide as target materials to deposit nanocrystalline platinum and an amorphous metal oxide on the substrate. The counter electrode exhibits improved performances as an electro-catalyst to assist in the reduction of I3− during operation of a dye-sensitized solar cell.

A solar cell includes a semiconductor substrate, an n+ region and a p+ region disposed on the semiconductor substrate, a first electrode electrically connected to the n+ region, and a second electrode electrically connected to the p+ region. A trench formed in the semiconductor substrate separates the n+ region from the p+ region.