Back contact cell and preparation method and cell string thereof

Abstract

This invention discloses a back-contact solar cell, its fabrication method, and a battery string. The back-contact solar cell includes a silicon wafer substrate, which has a first surface and a second surface disposed opposite to each other. The first surface has multiple main gate regions and multiple fine gate regions, spaced apart along a first direction. The first surface also includes an insulating layer disposed on the fine gate regions, covering them along the thickness direction of the silicon wafer substrate. The insulating layer is made of silicon dioxide. Thus, by fabricating an insulating layer containing silicon dioxide on the fine gate regions, replacing the insulating ink used in the prior art, the back-contact solar cell packaging process can be reduced while ensuring good insulation performance of the insulating layer, thereby lowering packaging costs and complexity, and improving the yield and reliability of the packaged back-contact solar cell.

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