A Design Method for Solar Spectrum Absorbing Film

A solar spectrum and design method technology, applied in the field of solar spectrum absorbing film layer design, can solve few problems such as process design and optimization, and achieve the goal of improving design and process optimization methods, reducing the selection range, and reducing manpower consumption Effect

Active Publication Date: 2020-12-11
HARBIN INST OF TECH
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The finite difference time domain method (FDTD) is an accurate and efficient electromagnetic wave simulation method. One of its important applications is to obtain the influence of submicron surface structure and topography on electromagnetic wave propagation through numerical simulation of electromagnetic waves. , but this method is rarely used in process design and optimization

Method used

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  • A Design Method for Solar Spectrum Absorbing Film
  • A Design Method for Solar Spectrum Absorbing Film
  • A Design Method for Solar Spectrum Absorbing Film

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specific Embodiment 1

[0041] like figure 1 Shown, the present invention provides a kind of solar spectrum absorbing film layer design method, comprises the following steps:

[0042] Step 1: Determine the dielectric function of the preselected material;

[0043] The step 1 is specifically:

[0044] Step 1.1: Select the type of material to be used based on the environmental stability, hardness and toughness of the pre-selected material, construct the unit cell model of the selected material in the Materials Studio crystal library, export it as a CIF file, and open it with an editor to extract the required VASP POSCAR information, and converted to POSCAR file;

[0045] Step 1.2: According to the elemental composition and unit cell model of the material, extract the PBE-GGA pseudopotential of the elements contained in the material, construct the POSCAR file, and obtain the KPOINTS file and the INCAR file;

[0046] Step 1.3: Create a scf folder, convert the CONTCAR file obtained by structural optimiz...

specific Embodiment 2

[0071] Step 1: Calculate the dielectric function of the pre-selected material by the first-principle method. Under the ideal surface state of the ideal bulk material, using the Fresnel formula, the spectral reflectance ρ and its refraction of the material at the corresponding wavelength λ can be obtained The relationship between the rate n and the extinction coefficient k:

[0072]

[0073] In the range of the solar spectrum, it is considered that the thickness of the film layer must be greater than its skin depth. In the absence of transmission, the following formula is satisfied at this time:

[0074]

[0075] It can be seen that the light absorption rate of the surface of an ideal bulk material is determined by the refractive index and extinction coefficient of the material, and the refractive index and extinction coefficient are actually related to the dielectric function:

[0076]

[0077]

[0078] Further, according to the Kramers-Kronig dispersion relation a...

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Abstract

The invention relates to a solar spectrum absorption film layer design method. The method comprises the following steps: determining a dielectric function of a pre-selected material; compounding the dielectric functions of the materials with different proportions, calculating to obtain a dielectric function curve, and screening a composite material proportion meeting requirements; constructing a film layer structure model, and determining physical data of the film layer structure model; changing and optimizing a single physical variable, and selecting a structure model meeting requirements oran optimal structure model; and selecting, formulating and optimizing a film preparation process according to the screened composite material ratio and the optimal structure model. The preparation process of the non-magnetic high solar spectrum absorptivity film layer is designed and optimized, the selection range of part of parameters in the experiment process can be remarkably narrowed, human and material resource losses caused by wrong experiments are reduced, the optimal process is determined more rapidly and efficiently, and therefore the film layer development and production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of absorbing film design, and relates to a method for designing solar spectrum absorbing film layers. Background technique [0002] Films with high solar spectral absorptivity have been widely used in many fields such as solar energy collection, photothermal conversion, photoelectric conversion, energy storage, catalysis, metal surface and interface protection, information dissemination, and protection of optical sensors, involving many industries Applied and basic research content, its role is irreplaceable. [0003] At present, there are many kinds of films with high solar spectral absorptivity, but due to many factors affecting their performance, such as the physical properties of the selected materials, surface microstructure, and different material ratios, etc., they will affect the optical properties of the prepared films. , electricity, heat and other key performances will be affected. Although a va...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20F24S70/20
CPCF24S70/20G06F30/20Y02E10/40
Inventor 卢松涛吴晓宏姚远李杨秦伟康红军
Owner HARBIN INST OF TECH
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