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Preparation method of p-type and n-type conductive lithium niobate nanowires

A technology of conductive lithium niobate and conductive nanometers, applied in chemical instruments and methods, nanotechnology for materials and surface science, nanotechnology, etc., can solve problems such as limiting the preparation of active devices, and achieve the promotion of development and repeatability High, simple method and effective effect

Active Publication Date: 2020-01-10
NANKAI UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

This technical bottleneck greatly limits the preparation of active devices based on lithium niobate

Method used

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  • Preparation method of p-type and n-type conductive lithium niobate nanowires
  • Preparation method of p-type and n-type conductive lithium niobate nanowires
  • Preparation method of p-type and n-type conductive lithium niobate nanowires

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preparation example Construction

[0036] After many times of research and development, the invention provides a preparation method of p-type and n-type conductive lithium niobate nanowires, which mainly includes the following steps:

[0037] Step 1: heat-treating the multi-domain lithium niobate crystal by using heat-fixing technology. In the heat treatment process, the temperature is raised first, and then kept for a period of time after rising to the specified temperature, and then the temperature is lowered at a certain rate. The protons in the crystal are fixed in the domain wall region through the heat treatment process;

[0038] Step 2: Polarize the lithium niobate crystal prepared above by using the electric polarization technology;

[0039] Step 3: Polarize the above-prepared lithium niobate crystals for the second time by using the electric polarization technique to change the conductivity type of the nanowires prepared in step 2. The preparation method utilizes the theory of proton fixation in lith...

Embodiment 1

[0063] The lithium niobate crystal used in this embodiment is Z tangential doped magnesium 5mol% lithium niobate crystal with the same composition, and the crystal size is: X×Y×Z=8mm×8mm×0.5mm. The lithium niobate crystal has been made into a periodically poled ferroelectric domain structure.

[0064] The specific implementation steps are:

[0065] (1) The periodically poled lithium niobate crystal in this embodiment is placed in a heating furnace for heat treatment. Experimental device such as figure 1 shown. The temperature rising rate is 5°C / min, the holding temperature is 120°C, the holding time is 2h (hour), and the cooling rate is 5°C / min.

[0066] (2) After the crystal is cooled to room temperature, use the liquid electrode to reverse the crystal’s back polarization, as shown in figure 2 shown. At this time, the positive pole of the high voltage power supply is connected to the -Z surface of the initial crystal, and the negative pole of the high voltage power sup...

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Abstract

The invention provides a preparation method of p-type and n-type conductive lithium niobate nanowires. The preparation method comprises the following steps: step 1, uniformly heating a multi-domain lithium niobate crystal for a certain time by using thermal immobilization technology, and naturally cooling to room temperature, so that protons in the crystal are fixed in a domain wall region; 2, carrying out primary polarization on the prepared lithium niobate crystal by using electric polarization technology; and 3, carrying out secondary polarization on the prepared lithium niobate crystal byutilizing electric polarization technology, so that the conductivity type of nanowires prepared in the step 2 can be changed, and the conversion of p-type and n-type conductive carrier types can be realized through one-time polarization inversion. According to the method, the regulation and control technology of transporting carriers in the lithium niobate crystal at nanoscale is achieved, and theregulation and control problem of the electrical properties of lithium niobate at nanoscale is solved.

Description

technical field [0001] The invention belongs to the technical field of preparation of crystal nanowires, and in particular relates to a preparation method of p-type and n-type conductive lithium niobate nanowires. Background technique [0002] Lithium niobate crystal (lithium niobate, LiNbO 3 ) is an important optical material, which has a wide range of applications in the fields of integrated optics, nonlinear optics, and optoelectronic components, and is known as one of the most promising "optical silicon" materials. Since lithium niobate crystals belong to wide bandgap materials (the bandgap width at room temperature is about 4.0eV), generally speaking, the conductivity of unreduced or nominally pure lithium niobate crystals is lower at room temperature or near room temperature. at 10 -16 -10 -18 Ω -1 cm -1 Therefore, limited by the large band gap, low conductivity and lack of stable p-type conductance of lithium niobate crystals, lithium niobate crystals have not sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/30C30B29/62C30B1/02C30B30/02B82Y40/00
CPCC30B29/30C30B29/62C30B1/02C30B30/02B82Y40/00C30B33/02C30B33/04B82Y20/00B82Y30/00C30B29/60
Inventor 张国权王晓杰焦跃健薄方许京军
Owner NANKAI UNIV
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