Fig. 1. Cell device model and structural parameters: (a) Schematic diagram of thin film solar cell and Ag@SiO₂; (b) the refractive index (n) and extinction (k) of materials.

Fig. 2. Regulation of SiO₂ on response spectrum of solar cell: (a) Reflectance spectrum; (b) transmitted spectrum; (c) absorption spectrum.

Fig. 3. Regulation of SiO₂ on response spectrum of solar cell: (a) Reflectance spectrum; (b) transmitted spectrum; (c) absorption spectrum.

Fig. 4. Spectral response characteristics and photoelectric conversion performance of solar cell with different structures: (a) Total absorption of cell devices; (b) external quantum efficiency; (c) optical loss in inactive layers; (d) current voltage characteristics.

Fig. 5. Distribution of photons energy in different structures ( = 650 nm): (a) SiO₂; (b) Ag@SiO₂.