High-speed photoelectronic device based on polar J-TMDs/beta-Ga2O3 heterojunction and preparation method thereof

Abstract

The invention discloses a high-speed photoelectronic device based on a polar J-TMDs / beta-Ga2O3 heterojunction and a preparation method thereof. The problem that an existing beta-Ga2O3-based photoelectronic device is low in response speed is mainly solved. The high-speed photoelectronic device comprises a substrate (1), a beta-Ga2O3 light absorption layer (2) and metal source and drain electrodes (4 and 5), the substrate adopts an SiO2 / Si substrate, SiO2 is used as a gate dielectric material, and Si is used as a gate electrode at the bottom; a polar J-TMDs layer is arranged at the upper part of the beta-Ga2O3 light absorption layer and is used for forming a heterojunction with the light absorption layer to inhibit exciton recombination, so that charges are quickly transferred at the interface of the heterojunction; and the metal source electrode is located at one end of the beta-Ga2O3 layer, and the metal drain electrode is located at one end, opposite to the metal source electrode, of the polar J-TMDs layer. According to the invention, the transmission performance at the interface is improved, the response speed of the device is improved, and the method can be used for preparing a high-performance photoelectric detector.

Description

technical field [0001] The invention belongs to the technical field of semiconductor devices, and further relates to a high-speed optoelectronic device, which is applied to the preparation of high-performance photodetectors. Background technique [0002] Ga 2 o 3 The material is a transparent oxide semiconductor material. As an important member of wide bandgap semiconductor materials, it benefits from the large size Ga 2 o 3 The breakthrough in single crystal preparation technology has become a major research hotspot in the field of semiconductors. Ga 2 o 3 The material has 5 isomers, namely α, β, γ, ε and δ, among which β-Ga 2 o 3 The material is the most stable crystalline structure. β-Ga 2 o 3 It has a very large bandgap width, between 4.2 and 4.9eV, and the absorption wavelength range corresponding to the bandgap range is 253nm to 295nm, extending to the deep ultraviolet region, and has a transmittance of more than 80% for ultraviolet light. The absorbing mate...

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Problems solved by technology

In 2009, Japanese scholar R Sukuki et al. published the article "Vertical solar-blind deep-ultraviolet schottky photodetectors based on β-Ga 2 o 3 In Substrates, it is proposed that in single crystal β-Ga 2 o 3 Preparation of Au / β-Ga on Substrate 2 o 3 Photodetectors with Shockley contacts, such as figure 1 As shown in (a), the results show that the maximum photoresponsivity of the annealed sample can reach 10 3 A / W, but its light response time is only about 9ms, which is difficult to meet actual needs

In 2013, Nakagomi et al. published the article "Deep ultraviolet photodiodes based on β-Ga 2 o 3 / SiCheterojunction" proposed to grow about 200nm β-Ga on the P-type 6H-SiC substrate 2 o 3 thin film, formed with β-Ga 2 o 3 / SiC heterojunction photodetectors, such as figure 1 As shown in (b), although the detector exhibits good rectification characteristics and good photoresponsivity, the response time of the detector is still on the order of milliseconds, which is much higher than that of mature silicon-based photodetectors in nanoseconds class response time

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