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Solar energy selective absorber materials utilizing multiple photonic heterostructure interfaces

A technology of heterostructure and absorbing materials, applied in the field of solar selective absorbing materials, can solve the problems of low absorption efficiency, low photothermal conversion efficiency, poor high temperature resistance, etc., achieve simple structure, improve photothermal conversion efficiency and performance excellent effect

Active Publication Date: 2021-04-20
ROCKET FORCE UNIV OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some current solar selective absorption film structures and materials still have limitations such as low absorption efficiency, poor high temperature resistance, and low light-to-heat conversion efficiency.
The solar absorbing film will absorb and store solar energy, but it will also dissipate energy due to infrared heat radiation

Method used

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  • Solar energy selective absorber materials utilizing multiple photonic heterostructure interfaces
  • Solar energy selective absorber materials utilizing multiple photonic heterostructure interfaces
  • Solar energy selective absorber materials utilizing multiple photonic heterostructure interfaces

Examples

Experimental program
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Effect test

Embodiment 1

[0023] When n=2, m=3, k=4, the heterogeneous membrane structure is A[T 1 A] 2 T 2 [BC] 3 T 3 [DE] 4 .

[0024] Interference absorbing layer structure A[T 1 A] n Using multi-layer interference plays a major role in absorption. A dielectric film material is silicon nitride (Si 3 N 4 ), the refractive index n at the solar energy high-energy wavelength center at 550nm A is 2, then the thickness d A =550nm / 4nA ≈70nm; absorbing film layer T 1 It is metal titanium Ti, thickness d T1 10nm.

[0025] Visible light control film structure[BC] m The photon band gap effect is used to achieve high reflection and absorption in the 0.4-0.78 visible light absorption band. B dielectric film material is magnesium fluoride (MgF 2 ), the refractive index n B is 1.38; the C dielectric film material is titanium oxide (TiO 2 ), the refractive index n C is 2.6. There is a dimensional design relation for n B d B +n C d C =λ 1 / 2, λ 1 It takes a value in the range of 450-700nm, ...

Embodiment 2

[0030] When n=3, m=4, k=6, the heterogeneous membrane structure is A[T 1 A] 3 T 2 [BC] 4 T 3 [DE] 6 .

[0031] Interference absorbing layer structure A[T 1 A] n Using multi-layer interference plays a major role in absorption. A dielectric film material is titanium oxide (TiO 2 ), the refractive index n at the solar energy high-energy wavelength center at 550nm A is 2.6, then the thickness d A =550nm / 4n A ≈52nm; the absorption layer T1 is polysilicon (Si), the thickness d T1 10nm.

[0032] Visible light control film structure[BC] m The photon band gap effect is used to achieve high reflection and absorption in the 0.4-0.78 visible light absorption band. B dielectric film material is titanium oxide (TiO 2 ), the refractive index n C 2.6; C dielectric film material is silicon oxide (SiO 2 ), the refractive index n E is 1.46. There is a dimensional design relation for n B d B +n C d C =λ 1 / 2, take the value within the range of 450-700nm. Here, λ 1 The va...

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Abstract

The invention discloses a solar energy selective absorption material utilizing multiple photon heterogeneous structure interface, and its heterogeneous film system structure is: A[T 1 A] n T 2 [BC] m T 3 [DE] k , including: ①Interference absorption layer structure A[T 1 A] n , ② Visible light control film structure [BC] m , ③ Infrared control film [DE] k , ④ Heterostructure interfacial absorbing layer T 2 , T 3 ; wherein, A, B, C, D, E are all dielectric layers, and the periodic coefficients m, n, and k of the film layers are integers with a value ≥ 2. The present invention utilizes the local state and photon band gap effect of multiple photonic crystal heterostructure interfaces through a special photonic heterogeneous dielectric artificial structure composite material to control the propagation state of light waves in different wavelength ranges in the material structure, so that It has a high absorption rate for the visible light-near-infrared wavelength range of 0.3-2μm, but has high reflection characteristics in the mid-to-far infrared region of ≥2.5μm, taking into account the efficient absorption of solar radiation energy and the low emission loss of infrared thermal radiation, which is convenient Improve the light-to-heat conversion efficiency of solar energy.

Description

technical field [0001] The invention relates to a solar energy efficient selective absorption material utilizing multiple photon heterostructure interfaces, and belongs to the technical field of solar energy selective absorption materials. Background technique [0002] The progress and development of human civilization are closely related to energy and cannot be separated. The current energy consumption in the world has far exceeded 6,000 gigawatts, and non-renewable fossil energy is already facing a serious crisis. As a clean and renewable new energy source, solar energy is the most effective way to solve the current global energy crisis and ecological imbalance. Solar energy is produced by thermonuclear fusion reaction, which brings "inexhaustible and inexhaustible" light and heat to the earth in the form of electromagnetic radiation. The heat collector is an important element in the light-to-heat conversion process, and the solar absorbing surface material of the heat c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24S70/225
CPCF24S70/225Y02E10/40
Inventor 王龙汪刘应唐修检刘顾阳能军田欣利赵文博
Owner ROCKET FORCE UNIV OF ENG
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