Photoelectric converter based on silicon photothermal electric effect and manufacturing method thereof

Abstract

The invention relates to a photoelectric conversion technology, in particular to a photoelectric converter based on a silicon photothermal electric effect and a manufacturing method thereof. The photoelectric converter comprises a silicon nanostructure, electrodes and a substrate, wherein the size of at least one dimension of the silicon nanostructure is 1-300 nanometers, the electrodes are in contact with the silicon nanostructure, and the silicon nanostructure is arranged on the substrate. The silicon nanostructure can inhibit the phonon scattering process and reduce the electron-phonon scattering action, a carrier temperature decoupled from a lattice temperature is generated, and the electrically connected electrodes and the silicon nanostructure form ohmic contact, so that the photovoltaic effect influence caused by Schottky contact is reduced. Photoelectric response is driven through the temperature gradient of photothermal carriers in the silicon nanostructure, the photothermal electric effect is enhanced by regulating and controlling the metal / silicon electrode contact barrier and the doping polarity and concentration of silicon, existence of a photoelectric conversion mechanism based on the photothermal electric effect of the silicon nanostructure is confirmed through optical-thermal-electrical multi-physics field transport simulation. The converter can effectively improve the photoelectric conversion efficiency.

Description

technical field [0001] The invention belongs to the technical fields of photodetector and photoelectric energy conversion, and in particular relates to a photoelectric converter based on silicon photothermoelectric effect and a manufacturing method thereof. Background technique [0002] Photoelectric conversion is a key mechanism in solar energy utilization, photodetectors and optical information devices. There are many photoelectric conversion mechanisms, the common ones are photoconductive effect, photovoltaic effect and other mechanisms that use photogenerated charge carrier separation, and the mechanism that uses material thermoelectric effect to generate heat from light. In the photoelectric conversion mechanism using the separation of photogenerated carriers, about 40% of the photon energy is wasted due to the rapid relaxation of the generated thermalized carriers to the bottom of the conduction band, and cannot be effectively utilized. This process is due to fast ele...

AI Technical Summary

Problems solved by technology

However, the controllable preparation of two-dimensional materials in a large area is difficult, and the light absorption coefficient of two-dimensional materials is very small, the material properties are unstable, and it is easy to be affected by the outside world, which limits the application prospects of its photothermoelectric effect.

Images