Abstract: The present disclosure provides a photovoltaic device and a method for forming the photovoltaic device. The photovoltaic device comprises a first solar cell structure having a photon absorbing layer comprising an organic material having a first bandgap; and a second solar cell structure having a photon absorbing layer comprising a material that has a Perovskite structure and having a second bandgap. The first and second solar cell structures are positioned at least partially onto each other.

Abstract: The present disclosure provides a photovoltaic device and a method for forming the photovoltaic device. The photovoltaic device comprises a first solar cell structure having a photon absorbing layer comprising an organic material having a first bandgap; and a second solar cell structure having a photon absorbing layer comprising a material that has a Perovskite structure and having a second bandgap. The first and second solar cell structures are positioned at least partially onto each other.

Abstract: A radiation detector includes a photodiode composed of an .alpha.-SiC substrate of a first conductivity type, a first .alpha.-SiC layer of the first conductivity type epitaxially formed on the .alpha.-SiC substrate, a second .alpha.-SiC layer of a second conductivity type having higher carriers concentration than the first .alpha.-SiC layer and epitaxially formed on the first .alpha.-SiC layer, a first electrode formed on the .alpha.-SiC substrate in ohmic contact, and a second electrode formed on the second .alpha.-SiC layer in ohmic contact; and a phosphor layer disposed on the photodiode to emit ultraviolet-rays by exposure of radiations.