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Multi-layered anti-reflecting film for solar cells

A solar cell and anti-reflection film technology, applied in the field of solar cells, can solve the problems of high reflectivity and high production cost of anti-reflection film, achieve simple preparation process, realize optical matching and electrical passivation, and increase passivation Effect

Inactive Publication Date: 2015-05-27
WUXI SAIJING SOLAR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the production cost of SiNx anti-reflection coating is relatively high, and components using SiNx as anti-reflection coating have high reflectivity after packaging

Method used

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  • Multi-layered anti-reflecting film for solar cells

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Embodiment Construction

[0010] like figure 1 As shown, a multi-layer anti-reflection film for a solar cell includes a solar cell layer 1, and SiO is arranged on and below the solar cell layer 1. 2 Film 2, SiO above and below solar cell layer 1 2 Antireflection film 3 is set on film 2; the SiO 2 The thickness of the film 2 is 3 to 60 nm; the thickness of the antireflection film 3 is 30 to 120 nm, and is a light-transmitting film with a refractive index of 2.3 to 2.5; the solar cell layer 1 is the P of the battery. + or N + .

[0011] Considering the optical principle, for a single-layer anti-reflection coating, when 4n 1 d 1 =λ, the reflectance has a minimum value:

[0012]

[0013] where n 1 , d 1 are the refractive index and thickness of the AR coating, respectively, n 0 is the refractive index of air or glass, n 2 for the substrate

[0014] , and λ is the center wavelength of the anti-reflection coating. From the above equation, it can be seen that when minimum reflecta...

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Abstract

The invention discloses a multi-layered anti-reflecting film for solar cells. The multi-layered anti-reflecting film comprises a solar cell layer, wherein SiO2 films are arranged onto and beneath a cell window layer; anti-reflecting films are arranged on the SiO2 films arranged onto and beneath the cell window layer; the thickness of the SiO2 films is 3-60 nm; the anti-reflecting films are transmitting films with the thickness of 30-120 nm and the reflection rate of 2.3-2.5. The multi-layered anti-reflecting film can seek the novel technical approach to replace the conventional SiNx single-layered anti-reflecting film commonly used in industry; by adopting the multi-layered film structure, optical matching and the electrical passivation effect can be realized, the anti-reflecting passivation effect of the multi-layered film structure is similar to that of the SiNx single-layered anti-reflecting film; besides, the multi-layered film structure is simple in preparation technology and low in equipment cost, and is a relatively ideal structure; furthermore, the multi-layered film structure is a composite structure with an upper structure and a lower structure which are the same, so that the passivation effect and the anti-reflecting effect are improved.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a multi-layer antireflection film for solar cells. Background technique [0002] TiO was generally used in early solar cell production 2 As an optical anti-reflection coating. But TiO 2 No passivation of silicon material, use TiO 2 The open circuit voltage of the solar cell used as the antireflection film is low, and it is difficult to improve the efficiency. Therefore, it is gradually replaced by SiNx anti-reflection film which has good anti-reflection effect and passivation at the same time. Therefore, SiNx is mostly used as the antireflection film in the current solar cell production. However, the production cost of SiNx anti-reflection coating is higher, and the reflectivity of components using SiNx as the anti-reflection coating is higher after packaging. SUMMARY OF THE INVENTION [0003] In order to solve the problems of the prior art, the present invention p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/0216
Inventor 蒋建宝
Owner WUXI SAIJING SOLAR
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