Ho Wen-Jeng, Deng Yu-Jie, Liu Jheng-Jie, Feng Sheng-Kai, Lin Jian-Cheng
Department of Electro-Optical Engineering, National Taipei University of Technology, No. 1, Section 3, Zhongxial East Road, Taipei 10608, Taiwan.
Materials (Basel). 2017 Jan 1;10(1):21. doi: 10.3390/ma10010021.
This paper reports on efforts to enhance the photovoltaic performance of textured silicon solar cells through the application of a layer of Eu-doped silicate phosphor with particles of various dimensions using the spin-on film technique. We examined the surface profile and dimensions of the Eu-doped phosphors in the silicate layer using optical microscopy with J-image software. Optical reflectance, photoluminescence, and external quantum efficiency were used to characterize the luminescent downshifting (LDS) and light scattering of the Eu-doped silicate phosphor layer. Current density-voltage curves under AM 1.5G simulation were used to confirm the contribution of LDS and light scattering produced by phosphor particles of various dimensions. Experiment results reveal that smaller phosphor particles have a more pronounced effect on LDS and a slight shading of incident light. The application of small Eu-doped phosphor particles increased the conversion efficiency by 9.2% (from 12.56% to 13.86%), far exceeding the 5.6% improvement (from 12.54% to 13.32%) achieved by applying a 250 nm layer of SiO₂ and the 4.5% improvement (from 12.37% to 12.98%) observed in cells with large Eu-doped phosphor particles.
本文报道了通过旋涂薄膜技术，应用一层具有各种尺寸颗粒的铕掺杂硅酸盐磷光体来提高纹理化硅太阳能电池光伏性能的努力。我们使用带有J图像软件的光学显微镜检查了硅酸盐层中铕掺杂磷光体的表面轮廓和尺寸。利用光学反射率、光致发光和外量子效率来表征铕掺杂硅酸盐磷光体层的发光下转换（LDS）和光散射。在AM 1.5G模拟下的电流密度-电压曲线用于确认各种尺寸的磷光体颗粒产生的LDS和光散射的贡献。实验结果表明，较小的磷光体颗粒对LDS有更显著的影响，并且对入射光有轻微的遮蔽。应用小尺寸的铕掺杂磷光体颗粒使转换效率提高了9.2%（从12.56%提高到13.86%），远远超过了应用250 nm厚的SiO₂层所实现的5.6%的提高（从12.54%提高到13.32%）以及在具有大尺寸铕掺杂磷光体颗粒的电池中观察到的4.5%的提高（从12.37%提高到12.98%）。
