An imaging device includes a plurality of pixels arranged in a pixel region, each of the plurality of pixels including a photoelectric conversion element including a first electrode provided above a substrate, a second electrode provided above the first electrode and a photoelectric conversion layer provided between the first electrode and the second electrode, an interconnection layer provided between the substrate and the first electrode, the interconnection layer including a first conductive member extending in a first direction, and a second conductive member arranged at a level lower than the first conductive member and extending in a second direction intersecting the first direction, a first contact portion provided in the pixel region, the first contact portion electrically connecting the second electrode and the first conductive member, and a second contact portion electrically connecting the first conductive member and the second conductive member.

The performance of lead sulfide quantum dot (QD) photovoltaic cells is improved by exposing a QD layer to a solution containing metal salts after the synthesis of the QDs is completed. The halide ions from the salt solution passivate surface lead (Pb) sites and alkali metal ions mend Pb vacancies. Metal cations and halide anions with small ionic radius have high probability of reaching QD surfaces to eliminate surface recombination sites. Compared to control devices fabricated using only a ligand exchange procedure without salt exposure, devices with metal salt treatment show increases in both the form factor and short circuit current of the PV cell. Some embodiments comprise a method for treatment of QDs with a salt solution and ligand exchange. Other embodiments comprise a photovoltaic cell having a QD layer treated with a salt solution and ligand exchange.

A structure includes a silicon substrate; silicon readout circuitry disposed on a first portion of a top surface of the substrate and a radiation detecting pixel disposed on a second portion of the top surface of the substrate. The pixel has a plurality of radiation detectors connected with the readout circuitry. The plurality of radiation detectors are composed of at least one visible wavelength radiation detector containing germanium and at least one infrared wavelength radiation detector containing a Group III-V semiconductor material. A method includes providing a silicon substrate; forming silicon readout circuitry on a first portion of a top surface of the substrate and forming a radiation detecting pixel, on a second portion of the top surface of the substrate, that has a plurality of radiation detectors formed to contain a visible wavelength detector composed of germanium and an infrared wavelength detector composed of a Group III-V semiconductor material.

A structure includes a silicon substrate; silicon readout circuitry disposed on a first portion of a top surface of the substrate and a radiation detecting pixel disposed on a second portion of the top surface of the substrate. The pixel has a plurality of radiation detectors connected with the readout circuitry. The plurality of radiation detectors are composed of at least one visible wavelength radiation detector containing germanium and at least one infrared wavelength radiation detector containing a Group semiconductor material. A method includes providing a silicon substrate; forming silicon readout circuitry on a first portion of a top surface of the substrate and forming a radiation detecting pixel, on a second portion of the top surface of the substrate, that has a plurality of radiation detectors formed to contain a visible wavelength detector composed of germanium and an infrared wavelength detector composed of a Group III-V semiconductor material.

The present invention relates to a solar cell having nanostructures on both surfaces of a transparent substrate, and to a method for manufacturing same. The nano-structures, which face each other with respect to the substrate and which transport electrons, are formed using zinc-oxide nanowires. Also, a hole-transport layer using CIS nanoparticles is formed in order to absorb light having a short wavelength and to transport generated holes. A hole-transport layer including CIGS nanoparticles for absorbing light having a relatively long wavelength is formed on the side facing the hole-transport layer including the CIS nanoparticles.

A method for manufacturing a quantum dot thin film includes applying a tensile force to a substrate to elongate the substrate, coating a quantum dot particle on the substrate to form a quantum dot thin film, replacing a ligand of the quantum dot particle, and removing the tensile force from the substrate. The method may reduce a crack in a quantum dot thin film.

An electro-optical device can include a plurality of nanocrystals positioned between a first electrode and a second electrode.

Photodetectors, methods of fabricating the same, and methods using the same to detect radiation are described. A photodetector can include a first electrode, a light sensitizing layer, an electron blocking/tunnelling layer, and a second electrode. Infrared-to-visible upconversion devices, methods of fabricating the same, and methods using the same to detect radiation are also described. An Infrared-to-visible upconversion device can include a photodetector and an OLDE coupled to the photodetector.

Disclosed are a photoelectronic device using a hybrid structure of silica nanoparticles and graphene quantum dots and a method of manufacturing the same. The photoelectronic device according to the present disclosure has a hybrid structure including graphene quantum dots (GODs) bonded to surfaces of silica nanoparticles (SNPs), thereby increasing energy transfer efficiency.

In various embodiments of the present disclosure, there is provided a method of manufacturing a monolayer graphene photodetector, the method including forming a graphene quantum dot array in a graphene monolayer, and forming an electron trapping center in the graphene quantum dot array. Accordingly, a monolayer graphene photodetector is also provided.