Emitter circulating type solar cell and preparation thereof

Abstract

The invention relates to a surrounding-emitting electrode solar cell and a preparation method thereof. The cell contains arrays which are arranged in a hexagonal lattice way and penetrate through holes 2 of an irradiation surface and a backlight surface of a silicon chip 1 in the silicon chip 1, therefore, the quantity of the through holes is minimized, and the breakage ratio of the silicon chip in the process of the hole drilling technology is reduced; a heavily doped emitting electrode 6 included on the back surface of the silicon chip 1 partially enters into the through holes, and a first conductive metal electrode 5 is arranged on the heavily doped emitting electrode 6, and plays the role of collecting minority carriers. A groove is arranged at the circumference of the first conductive metal electrode 5 by etching, a second conductive metal electrode 7 is arranged in the groove and plays the role of collecting majority carriers, and the first conductive metal electrode 5 and the second conductive metal electrode 7 deposited in the groove are insulated and isolated through the step of the groove.

Description

A kind of emitter surrounding solar cell and its preparation method technical field The invention relates to a solar cell and a preparation method thereof, in particular to an emitter wrap-around (EWT) solar cell and a preparation method of the solar cell. Background technique Back contact silicon solar cells have several advantages over conventional silicon solar cells. The first advantage is that back-contact cells have higher conversion efficiencies due to reduced or eliminated shading losses of the contact grid (sunlight reflected from the grid cannot be converted into electrical current). A second advantage is that since the contact areas for both polarities are made on the backlight side, back-contact cells are easier to assemble into circuits and are therefore less expensive. Back contact cells also have a more uniform appearance and thus better aesthetics. There are several methods for fabricating back-contact silicon solar cells. These methods include metalliz...

AI Technical Summary

Problems solved by technology

The purpose of the present invention is to overcome the shortcomings of too many through holes in the prior art of EWT solar cells and the preparation process is too complicated, and provide EWT solar cells and its preparation method

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