Monolithic crystalline silicon solar cells with SiN_x layers doped with Tb³⁺ and Yb³⁺ rare-earth ions

Ing-Song Yu¹，Shao-Chun Wu¹

1. Department of Materials Science and Engineering, National Dong Hwa University

摘 要：In this study, we propose the fabrication of monolithic crystalline silicon solar cells with Tb³⁺ and Yb³⁺-doped silicon nitride（SiN_x） layers by low-cost screen-printing methods. The performances of c-Si solar cells can be enhanced by rare-earth ions doped SiN_x layers via the mechanism of spectrum conversion.These SiN_x doped and codoped thin films were deposited by reactive magnetron co-sputtering and integrated as the antireflection coating layers in c-Si solar cells. The characterizations of SiN_x, SiN_x:Tb³⁺ tand SiN_x:Tb³⁺-Yb³⁺ thin films were conducted by means of photoluminescence, Rutherford backscattering spectroscopy, Ellipsometry spectroscopy and Fourier transform infrared measurements. Their composition and refractive index was optimized to obtain good anti-reflection coating layer for c-Si solar cells.Transmission electron microscopy performs the uniform coatings on the textured emitter of c-Si solar cells. After the metallization process, we demonstrate monolithic c-Si solar cells with spectrum conversion layers, which lead to a relative increase by 1.34% in the conversion efficiency.

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