New structure crystal silicon solar energy battery

Abstract

The invention is a crystalline silicon solar battery adopting emission region on film silicon back, belonging to a new structured photovolt battery, and its key point is depositing a layer of silicon film on the back to form heterogeneous PN junction on an N-type monocrystalline silicon substrate so as to replace the homogenous PN junction on the right side of a battery, prepared by routine diffusion, where the deposited silicon film can noncrystalline, microstalline, or nanocrystalline film; the heterogenerous PN junction forming method can directly deposit a P-type silicon film on the N-type monocrystalline silicon, and can firstly deposit a layer of intrinsic silicon film on the N-type monocrystalline silicon and then deposit the P-type silicon film. Thus, the battery efficiency can reach above 20%.

Description

1. Technical field [0001] The invention relates to a new structure of a solar cell, which belongs to the field of solar energy application. 2. Background technology [0002] Crystalline silicon solar cells occupy more than 90% of the world's photovoltaic market. This kind of battery generally uses P-type crystalline silicon, which forms an N-type emitter region through high-temperature diffusion, and belongs to a homogeneous PN junction solar cell. But the disadvantage of this kind of battery is: high-temperature diffusion may cause more defects in silicon materials, and if there is pollution in the high-temperature process, the efficiency of the battery will be greatly reduced, so higher requirements are placed on materials and production environments. . In addition, the back surface of this battery has no effective passivation and no effective light-trapping structure, so the recombination of the back surface is relatively serious, and some light penetrates the active ar...

AI Technical Summary

Problems solved by technology

But the disadvantage of this kind of battery is: high-temperature diffusion may cause more defects in silicon materials, and if there is pollution in the high-temperature process, the efficiency of the battery will be greatly reduced, so higher requirements are placed on materials and production environments.

If the amorphous emitter region is too thin, even the carrier in the emitter region will be completely depleted, which will reduce the efficiency of the battery

In addition, since the front of the battery must use a transparent conductive film, it will also cause a light loss of about 10% (generally, the transmittance of a transparent conductive film is up to 90%)

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