Liquid-phase sintered Si3N4 coatings for impurity suppression and performance enhancement in cast monocrystalline silicon

IF 6.3 2区材料科学 Q2 ENERGY & FUELS

Solar Energy Materials and Solar Cells Pub Date : 2025-09-29 DOI:10.1016/j.solmat.2025.113986

Xueri Zhang , Qi Lei , Zhiyong Yuan , Xiaoqing Xi , Jinbing Zhang , Dongli Hu

引用次数: 0

Abstract

A modified silicon nitride (Si₃N₄) coating incorporating micro-silica powder was developed to suppress impurity diffusion in cast silicon during directional solidification. Through localized liquid-phase sintering, the coating achieved improved densification and controlled oxygen incorporation. Compared with conventional spray coatings, the optimized formulation reduced red-zone thickness by 20 %, decreased Fe concentration by 46 %, and maintained moderate oxygen levels. These improvements led to enhanced minority carrier lifetime and increased solar cell conversion efficiency from 22.65 % to 23.06 %. Microstructural analysis confirmed better pore closure and melt corrosion resistance. This study presents a scalable coating strategy for producing high-quality silicon with improved photovoltaic performance.

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液相烧结Si3N4涂层在铸造单晶硅中的杂质抑制和性能增强

制备了一种含有微硅粉的改性氮化硅（Si3N4）涂层，以抑制铸硅定向凝固过程中的杂质扩散。通过局部液相烧结，涂层致密性得到改善，氧含量得到控制。与传统喷涂涂层相比，优化后的配方使红区厚度减少了20%，铁浓度降低了46%，并保持了适度的氧水平。这些改进提高了少数载流子寿命，并将太阳能电池的转换效率从22.65%提高到23.06%。微观结构分析证实其具有较好的闭孔性和抗熔体腐蚀性能。本研究提出了一种可扩展的涂层策略，用于生产具有改进光伏性能的高质量硅。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Solar Energy Materials and Solar Cells 工程技术-材料科学：综合

CiteScore

12.60

自引率

11.60%

发文量

513

审稿时长

47 days

期刊介绍： Solar Energy Materials & Solar Cells is intended as a vehicle for the dissemination of research results on materials science and technology related to photovoltaic, photothermal and photoelectrochemical solar energy conversion. Materials science is taken in the broadest possible sense and encompasses physics, chemistry, optics, materials fabrication and analysis for all types of materials.