Method for preparing double-faced back contact solar cell

Abstract

The invention discloses a method for preparing a double-faced back contact solar cell, comprising following steps: (1) holing; (2) washing, and texturizing the front face and the back face of a silicon wafer; (3) arranging a first doping agent on the front face and in the hole of the silicon wafer, and arranging the first doping agent in the surrounding area of the hole in the back face of the silicon wafer, wherein the doping type of the first doping agent is opposite to that of the silicon wafer; (4) arranging a second doping agent in the non-hole surrounding area on the back face of the silicon wafer, wherein the doping type of the second doping agent is the same as that of the silicon wafer; (5) growing barrier layers on the front face and the back face of the silicon wafer; (6) annealing the silicon wafer at the temperature of 800 to 1000 DEG C, diffusing and making junctions; (7) etching peripheral junctions; (8) washing and removing the barrier layers; (9) arranging passivation anti-reflection films on the front face and the back face of the silicon wafer; and (10) arranging a porous metal electrode in the hole, printing and sintering. Adopting a method for arranging the doping agents, i.e. adopting the various type doping agents on two faces of the silicon wafer, the double-faced back contact solar cell realizes the co-diffusion of boron-phosphor in the presence of the barrier layers, thereby greatly simplifying process flows and reducing the production cost.

Description

technical field

[0001] The invention relates to a preparation method of a double-sided back-contact solar cell, which belongs to the field of solar cells. Background technique

[0002] Conventional fossil fuels are being exhausted day by day. Among the existing sustainable energy sources, solar energy is undoubtedly the cleanest, most common and most potential alternative energy source. At present, among all solar cells, crystalline silicon solar cells are one of the solar cells that have been widely commercialized. This is due to the extremely abundant reserves of silicon materials in the earth's crust. , has excellent electrical and mechanical properties. Therefore, crystalline silicon solar cells occupy an important position in the field of photovoltaics. High efficiency is the current development trend of crystalline silicon solar cells. The conversion efficiency of solar cells is improved by improving surface texture, selective emission junction, passivation of the fr...

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