Efficient crystalline silicon solar cell and production method thereof

Abstract

The invention discloses an efficient crystalline silicon solar cell which comprises back electrodes, an aluminum back surface field, P type silicon, N type silicon, a silicon nitride film and positive electrodes. A phosphorus source coats the silicon nitride film, then laser doping grooves are formed in the silicon nitride film through laser etching, phosphorus is doped into the silicon in the laser doping grooves, and the laser doping grooves form a linear positive electrode grid line pattern. The bottoms of the positive electrodes are located in the laser doping grooves. The invention further discloses a method for producing the efficient crystalline silicon solar cell. The efficient crystalline silicon solar cell has the advantages that the laser doping grooves are formed through laser phosphorus source doping, phosphorus doping concentration on the surface of a silicon wafer is in selective distribution, the laser phosphorus doping concentration of the areas within grid lines is high, and good ohmic contact of the grid lines and the silicon is guaranteed; high sheet resistance diffusion is used to allow the doping concentration of areas outside the grid lines to be low, the open-circuit voltage and the short circuit currents of the solar cell are increased, and the photoelectric conversion efficiency of the solar cell is increased.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a high-efficiency crystalline silicon solar cell and a preparation method thereof. Background technique [0002] A solar cell is a device that effectively absorbs solar radiation energy and uses the photovoltaic effect to convert light energy into electrical energy. When sunlight shines on a semiconductor P-N junction (P-N Junction), a new hole-electron pair (V-E pair) is formed. , Under the action of the P-N junction electric field, holes flow from the N region to the P region, electrons flow from the P region to the N region, and a current is formed after the circuit is turned on. Because it is a solid semiconductor device that converts sunlight energy into electrical energy by using the photovoltaic effect of various potential barriers, it is also called a solar cell or a photovoltaic cell, and is an important component of a solar array power system. [0003] Solar cells ...

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Problems solved by technology

[0004] like figure 1 As shown, the P-N junction of traditional solar cells is made by primary phosphorus doping. In order to increase the open circuit voltage and short circuit current of the battery, the only way to increase the overall diffusion resistance and reduce the phosphorus doping concentration, but this This method reduces the phosphorus doping concentration in the area below the silver grid line, and the silver grid line and silicon cannot form a good ohmic contact, resulting in a low fill factor of the battery and inhibiting the improvement of the photoelectric conversion efficiency of the battery.

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