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Germanium-silver composite and application thereof in photoelectric devices

A technology of composite materials and optoelectronic devices, applied in the field of optoelectronics, can solve problems such as limiting the application of germanium, and achieve the effect of enhancing photoelectric response

Active Publication Date: 2016-08-17
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the application of germanium in the field of optoelectronics is limited

Method used

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  • Germanium-silver composite and application thereof in photoelectric devices
  • Germanium-silver composite and application thereof in photoelectric devices
  • Germanium-silver composite and application thereof in photoelectric devices

Examples

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Embodiment 1

[0050] The invention provides a germanium-silver composite material, please refer to figure 1 , which is a simplified structural schematic diagram of the germanium-silver composite material, including intrinsic germanium 1 and silver nanoparticles 2 buried in the intrinsic germanium 1 . In the germanium-silver composite material of the present invention, silver and germanium do not form a bond, but form a composite structure.

[0051] Specifically, intrinsic germanium refers to pure germanium completely free of impurities and lattice defects.

[0052] As an example, the germanium-silver composite material is obtained by implanting silver ions into intrinsic germanium by ion implantation and annealing. Since pure silver ions do not have localized surface plasmon resonance properties, in the present invention, the annealing function is to agglomerate the implanted silver ions into silver nanoparticles, and silver nanoparticles have localized surface plasmon resonance properties...

Embodiment 2

[0057] The present invention also provides an application of a germanium-silver composite material in a photoelectric device. The germanium-silver composite material adopts any germanium-silver composite material described in the first embodiment.

[0058] Specifically, the application is to use the localized surface plasmon resonance enhancement effect of silver nanoparticles to enhance the photoelectric response of germanium in the near-infrared band. Or the application is to use the local surface plasmon resonance enhancement effect of silver nanoparticles and the surface plasmon resonance coupling repulsion between silver nanoparticles to regulate the resonance enhancement peak frequency in the near-infrared band.

[0059] As an example, the application is a germanium-silver composite material as the intrinsic layer material of a PIN photodiode.

[0060] PIN photodiodes are also called PIN junction diodes or PIN diodes, which sandwich a layer of intrinsic semiconductor (In...

Embodiment 3

[0065] This example verifies that the germanium-silver composite material of the present invention can enhance the spectral range of germanium photoelectric response from visible light to near-infrared through theoretical calculation.

[0066] The photoelectric response process of germanium is that photons transfer energy to electrons to become free electrons. Therefore, the photoelectric response characteristics of germanium can be effectively reflected by studying the extinction spectrum of germanium (light absorption and scattering, both processes have energy exchange with electrons). In this embodiment, the finite difference time domain method (FDTD) is used to simulate and calculate the extinction spectrum.

[0067] In order to explore the basic LSPR extinction characteristics of nanoparticles in germanium, a simplified model of silver nanospheres is used for calculation in this embodiment. Numerical simulation model of the present invention such as Figure 3-6 Shown, w...

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Abstract

The invention provides a germanium-silver composite and application thereof in photoelectric devices. The germanium-silver composite comprises intrinsic germanium and silver nanoparticles buried in the intrinsic germanium. The germanium-silver composite can be made by injecting silver ions the intrinsic germanium by ion injection and annealing. Through local surface plasma resonance enhancement of the silver nanoparticles and resonance coupling and repulsion of surface plasma between the nanoparticles, the frequency of resonance enhancement peaks can be regulated to near-infrared band, thereby enhancing photoelectric response of germanium in near-infrared band. By controlling the density of silver nanoparticles in the intrinsic germanium, photoelectric response spectral range of enhanced germanium can be effectively controlled from visible light to near-infrared.

Description

technical field [0001] The invention belongs to the field of optoelectronics, and relates to a germanium-silver composite material and its application in optoelectronic devices. Background technique [0002] As an important semiconductor material in the field of microelectronics, germanium has higher carrier mobility and smaller band gap than silicon, so it has better performance than silicon in microelectronics, and may even replace silicon as a mainstream in the microelectronics industry. However, high-purity germanium single crystal has a high refractive index, is transparent to infrared rays, and does not pass through visible light and ultraviolet rays. Therefore, the application of germanium in the field of optoelectronics is limited. [0003] Localized surface plasmon resonance (LSPR) is the coupling effect of collective oscillation of free electrons on the surface of metal nanoparticles and incident photons. Due to its resonance wavelength, the local field strength...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/015H01L31/115B82Y30/00
CPCB82Y30/00G02F1/015G02F1/0154H01L31/115
Inventor 李伟狄增峰齐功民张苗母志强王曦
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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