Solar cell

Abstract

A solar cell includes a p-n structure having a first conductive semiconductor substrate, a second conductive semiconductor layer formed on the first conductive semiconductor substrate and having a conduction opposite to the first conductive semiconductor substrate, and a p-n junction formed at an interface between the first conductive semiconductor substrate and the second conductive semiconductor layer; a passivated layer formed on the second conductive semiconductor layer and composed of silicon oxynitride with a refractive index of 1.45 to 1.70; an anti-reflection film formed on the passivated layer and composed of silicon nitride; a front electrode connected to the second conductive semiconductor layer with passing through a part of the passivated layer and the anti-reflection film and exposed outward; and a rear electrode formed at an opposite side to the front electrode with the first conductive semiconductor substrate being interposed therebetween to be connected to the first conductive semiconductor substrate.

Description

technical field [0001] The invention relates to a solar cell, in particular to a solar cell with excellent photoelectric conversion efficiency. The solar cell has an improved anti-reflection film, thereby reducing the reflectivity to sunlight and increasing the FF value. Background technique [0002] In recent years, with the shortage of existing resources such as oil and coal, attention to alternative energy sources to replace them has gradually increased. Among them, solar cells have attracted much attention because they are rich in energy and do not cause environmental pollution. Solar cells are divided into solar thermal cells and solar photovoltaic cells. The so-called solar thermal cells use solar heat to generate the steam required for rotating turbines. The so-called solar cells use the properties of semiconductors to convert sunlight (photons) into electrical energy. , Usually solar cells refer to solar photovoltaic cells (hereinafter referred to as solar cells). ...

AI Technical Summary

Problems solved by technology

However, when the microelectronic layer has the above-mentioned refractive index distribution, on the contrary, the ratio of sunlight reaching the p-n junction structure that produces the photoelectric effect decreases, and the efficiency of the solar cell decreases.

The reason is that when sunlight is incident on the microelectronic layer, part of the light is guided along the plane through the intermediate layer with a relatively large refractive index, so that the ratio of sunlight reaching the p-n junction decreases.

Moreover, the microelectronic layer of this U.S. patent is limited when used as an anti-reflection film structure for high-efficiency solar cells

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