N-type TOPCon cell with double-sided aluminum paste electrodes, and preparation method for preparing N-type TOPCon cell with double-sided aluminum paste electrodes

US12419135B2 · kind B2 · utility

Assignee

• CHINT NEW ENERGY TECHNOLOGY CO., LTD. · CN

Inventors

• Mingzhang Feng · Zhejiang, CN
• Sheng HE · Zhejiang, CN
• Wei-Chih Hsu · New Taipei, TW

Key dates

• Filing date: May 25, 2021
• Grant date: Sep 16, 2025
• Expiry date: May 25, 2041

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P70/50

Abstract

Some embodiments of the present disclosure provide an N-type TOPCon cell with double-sided aluminum paste electrodes, and a preparation method therefor. The front side of the cell is provided with a front-side silver main grid and a front-side aluminum fine grid, and the back side is provided with a back-side silver main grid and a back-side aluminum fine grid. The method for preparing the cell includes: texturing→B diffusion→BSG removal→alkali polishing→depositing a tunnel oxide layer and a polysilicon layer on a back side of a substrate by means of LPCVD→P diffusion on the back side→PSG removal→plating removal→deposition of an AlOx preparatory layer and a first SiNxHy preparatory layer on the front side→deposition of a second preparatory layer SiNxHy on the back side→UV laser ablation on the front side of the substrate and the back side of the substrate→screen printing.