US 12658397 B2 / Jun 16, 2026

Photocathode including nanostructures for extended wavelengths

A photocathode. The photocathode includes an absorber. The absorber a p-type bulk active layer and a plurality of nanostructures formed on the p-type bulk active layer. The Photocathode further includes the plurality of nanostructures, such that the plurality of nanostructures are formed at a band bending region between the bulk active layer and the vacuum.