Back contact heterojunction solar battery based on P-type silicon slice

Abstract

The invention relates to a solar cell, in particular to a back contact heterojunction solar cell based on a P-type silicon chip. From the back features, it is divided into N-type region and P-type region. The N-type region forms a P+a-si / i-a-si / P-c-si / P+c-si / i-a-si / N-a-si heterojunction structure, P The P+a-si / i-a-si / P-c-si / P+c-si heterojunction structure is formed in the type region, which has better spectral response, and the sunlight travels in the battery with a longer optical path, and the battery is compared with conventional crystalline silicon The thickness of the solar cell is greatly reduced; the electrodes are all printed on the back of the cell, which avoids the problem of shading the front electrode of the conventional solar cell, improves the short-circuit current of the solar cell, and thus greatly improves the conversion efficiency of the solar cell. The low-temperature sintering process greatly simplifies the production process. The production cost is reduced, and it is suitable for industrialized production.

Description

technical field [0001] The invention relates to a solar cell, in particular to a back contact heterojunction solar cell based on a P-type silicon wafer. Background technique [0002] In the 21st century, energy crisis and environmental pollution have become global problems that need to be solved urgently. The development of green energy has become the main method to solve the crisis. Among them, solar cells have become the goal of competing development of countries all over the world because of their cleanliness, safety and renewability. At present, the main development direction of solar cells is to reduce costs and increase efficiency. [0003] The heterojunction solar cell composed of new amorphous silicon and crystalline silicon has a simple structure and simple process. It combines the advantages of high carrier mobility of crystalline silicon with the advantages of low-temperature chemical vapor deposition of amorphous silicon technology, and has become the leading s...

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Problems solved by technology

[0004] The solar cells with the above-mentioned HIT structure have the following problems: the first amorphous silicon film has many defects, which increases the carrier recombination defect density in the film body and affects the collection and transmission of photo-generated current; The light-receiving area is reduced, thereby reducing the short-circuit current and affecting the final conversion efficiency of the solar cell

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