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对N型道氧化物被动接触太阳能电池的n+Poly-Si层金属化的影响
Qinqin Wang1, Beibei Gao1,2, Wangping Wu3
1Institute of Technology for Carbon Neutralization, Yangzhou University, Yangzhou 225009, China.
Materials (Basel, Switzerland)
|June 19, 2024
概括
在n型道氧化物被动接触 (n-TOPCon) 太阳能电池中优化薄的多 (多Si) 层提高了效率. 70纳米的聚Si层将重组和接触电阻降到最低,将太阳能电池的转换效率提高到25.65%.
科学领域:
- 材料科学 材料科学 材料科学
- 半导体物理 半导体物理
- 太阳能光伏发电是如何实现的
背景情况:
- 消极接触对高效太阳能电池至关重要,例如n型道氧化物消极接触 (n-TOPCon).
- 薄的多 (poly-Si) 层提供了一种具有成本效益的解决方案,以减少n-TOPCon太阳能电池中的寄生虫吸收.
研究的目的:
- 调查n+-poly-Si层厚度对n-TOPCon太阳能电池性能的影响.
- 优化聚Si层沉积,以改善被动化和降低接触电阻.
- 通过过程优化,在n-TOPCon太阳能电池中实现更高的转换效率.
主要方法:
- 使用低压化学蒸气沉积 (LPCVD) 制造30至100nm厚度的n+-poly-Si层.
- 分析聚Si厚度对金属化接触微观结构,被动化质量和电子性能的影响.
- 在金属化下重组的表征 (J0,m) 和接触电阻 (ρ).
主要成果:
- 聚Si层厚度显著影响金属化诱导的重组 (J0,m) 和接触电阻 (ρ).
- 短路电流密度 (Jsc) 受到最小的影响,在厚度大于40nm的聚Si层中观察到银腐蚀.
- 一个优化的70nmn+-poly-Si层,其表面度为5×10^20原子/cm3,实现了低J0,m和 ρ.
结论:
- 一个70纳米的配合的多Si层是n-TOPCon太阳能电池的最佳选择,平衡了被动和导电性.
- 这种优化的层结构导致转换效率大幅提高,达到25.65%.
- 开发的沉积过程在商业上是可行的,可以减少光伏的制造时间和成本.
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