Low-cost MWT silicon solar cell and preparation method thereof

Abstract

The invention discloses a low-cost MWT silicon solar cell and a preparation method thereof. The low-cost MWT silicon solar cell comprises a silicon slice, a front-face grid line electrode arranged atthe front face of the silicon slice, an antireflective film covered on the front-face grid line electrode and the front face of the silicon slice and an aluminum back surface field arranged at the back face of the silicon slice, wherein the silicon slice is provided with multiple through holes, the through holes are filled with hole-filling metal electrodes, the top of each hole-filling metal electrode is covered with a front-face metal electrode, the bottom of each hole-filling metal electrode is provided with a back-face metal electrode, and the front-face grid line electrode is communicatedwith the front-face metal electrode. The preparation method includes the steps of laser drilling, texturing, diffusion, film covering, etching, positive electrode preparing, film coating, back electrode and aluminum surface-back-field preparing and sintering. The low-cost MWT silicon solar cell and the preparation method thereof can greatly reduce the preparation cost of crystalline silicon. Because the positive electrode does not need to penetrate through a silicon nitride film, the sintering temperature can be reduced to below 700 DEG C, electrical attenuation caused by B-O in P-type matrixsilicon can be effectively reduced even avoided, and the energy consumption is reduced.

Description

technical field [0001] The invention relates to a silicon solar cell, in particular to a low-cost MWT silicon solar cell and a preparation method thereof. Background technique [0002] At present, high-efficiency technologies for crystalline silicon solar cells mainly include heterojunction solar cells (HIT), fully back-contact silicon solar cells (IBC), emitter wrap-through silicon solar cells (EWT), laser-grooved buried-gate cells, tilted Evaporated metal contact silicon solar cells (OECO) and metal perforated silicon solar cells (MWT), among which MWT cells are more and more used because of their high efficiency, low cost, small shading area and better appearance. [0003] The MWT silicon solar cell transfers the carriers collected from the front side to the back side of the cell through laser drilling, and improves the conversion efficiency by reducing the shading area. [0004] In the prior art, when preparing MWT solar cells, the conventional battery process is genera...

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Problems solved by technology

This is the main reason for the high cost of the front electrode paste, and the lead-containing glass body also poses challenges to the environment

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