Novel solar cell back reflector with AAO nanometer grating structure

A technology of solar cells and nano gratings, applied in photovoltaic power generation, circuits, electrical components, etc., can solve the problems of unsuitability for mass production, high cost, harsh preparation conditions of gratings for thin-film silicon solar cells, etc., and achieve the goal of improving photoelectric conversion efficiency Effect

Inactive Publication Date: 2015-09-09
TIANJIN POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problems of harsh preparation conditions, high cost, and unsuitability for mass production of gratings for thin-film silicon solar cells, this patent design proposes a new solar cell back reflection structure

Method used

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  • Novel solar cell back reflector with AAO nanometer grating structure
  • Novel solar cell back reflector with AAO nanometer grating structure
  • Novel solar cell back reflector with AAO nanometer grating structure

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Embodiment

[0015] The back reflector designed by the patent of the present invention can be used in various solar cells such as thin film silicon and crystalline silicon. AAO nanograting structures such as figure 1 shown. The structure of the back reflector and the schematic diagram of the optical path are shown in figure 2 As shown, where P is the grating period, that is, the distance between the center points of the AAO apertures, and h is the grating aperture depth, that is, the AAO aperture depth.

[0016] working principle

[0017] The main function of the back reflector is to diffract light that is not absorbed by silicon back into the working substance through the grating, thereby increasing the distance of light propagation in silicon. The modulation of light by a grating can be described by the grating equation.

[0018] Grating structure parameter selection

[0019] Selection of the grating constant P: Take the vertical incidence of light as an example to design the grati...

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Abstract

The invention puts forward an idea that an AAO template serves as a nanometer grating which is introduced to a thin-film silicon solar cell structure, and designs and provides a novel solar cell back reflector with an AAO nanometer grating structure. The reflector is formed by a three-layer structure of a silver back reflection layer, the AAO nanometer grating and ITO conductive glass. According to a grating equation, the optimum AAO structure parameters are obtained through design and analysis. The reflector can effectively prolong light path inside a solar cell, improves long-wavelength photon utilization rate, and furthermore, improves photoelectric conversion efficiency of the solar cell. The reflector is simple in manufacturing process, low in cost, and suitable for batch production.

Description

Technical field [0001] The solar cell back reflector invented by this patent is composed of AAO (anodized aluminum oxide template) nano-grating and silver back reflector, which can be directly applied to various thin-film silicon solar cells, thereby improving the photoelectric conversion efficiency of solar cells. Background technique [0002] As we all know, thin-film silicon solar cells are favored because of less material and low cost, but they also face the problem of low efficiency. One of the reasons is that as the wavelength of incident light increases, the corresponding absorption coefficient decreases rapidly, and the absorption length The absorption length required for wavelength photons is greatly increased, and the thickness of the thin-film battery is thin, so that the path of photons passing through the battery is greatly shortened. In order to improve the photoelectric conversion efficiency of solar cells, the usual practice is to prepare diffraction gratings...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/054
CPCY02E10/52
Inventor 张海明秦飞飞王旭王彩霞
Owner TIANJIN POLYTECHNIC UNIV
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