Method for improving solar cell current density and cell efficiency and cell structure

Abstract

The invention provides a method of improving the current density and the cell efficiency of a solar cell and a cell structure. The method comprises the step that a layer of combined structure formed by one or more of a micro carbon nanostructure or metal micro nano-particles or a transparent conducting thin film is arranged on the surface of a cell to enhance the light utilization efficiency of the cell. The combined structure is directly manufactured on the upper surface of the cell, or is manufactured on an independent structure, and then the combined structure is placed on the cell. The manufactured transparent conducting thin film improves the utilization rate of sunlight, and enhances the current density and the cell efficiency of the solar cell by about 2%. Meanwhile, the method is simple in process, convenient to operate, low in cost, and obvious in effect. The thin film of the combined structure manufactured by the micro carbon nanostructure, the metal nano-particles and the transparent conducting thin film is good in light transmittance, and has a good application prospect in the aspect of replacing traditional conducting glass.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and relates to a method for preparing a composite structure of a nano-microcarbon structure, metal nanoparticles and a transparent conductive film and a battery structure. Efficiency enhancement to increase the current density and cell efficiency of solar cells. Background technique [0002] Conductive glass such as ITO and FTO are widely used in many fields, such as display, communication, medical, aerospace, military and solar cells. However, ITO and FTO also have many problems: (1) The reserves of metal indium available on the earth are only 20,000 tons, which is less than that of rare earths (24,000 tons), which leads to higher and higher manufacturing costs of solar cells; (2) ITO and FTO are not stable enough under acid or alkali conditions, resulting in a limited range of use; (3) ions are easily diffused into the polymer layer; (4) the light transmittance in the near-infrared region ...

AI Technical Summary

Problems solved by technology

However, ITO and FTO also have many problems: (1) The reserves of metal indium available on the earth are only 20,000 tons, which is less than that of rare earths (24,000 tons), which leads to higher and higher manufacturing costs of solar cells; (2) ITO and FTO are not stable enough under acid or alkali conditions, resulting in a limited range of use; (3) ions are easily diffused into the polymer layer; (4) the light transmittance in the near-infrared region is relatively limited, As a result, the sunlight cannot be fully utilized; (5) Due to the defects in the FTO structure, it is easy to cause current leakage

The theoretical upper limit of the efficiency of solar cells made of silicon materials is about 30%, and the efficiency of solar cells made with existing technological levels is close to the theoretical limit, and it is difficult to further improve

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