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We propose a thin-film c-silicon (silicon is 1 μm) heterojunctions solar cells (SSCs) based on the combination of Ag nanoparticles (NPs) and TiO 2 inverted triangular prism (IP). We find that the solar energy absorption of the SSCs with TiO 2 IP and Ag NPs is basically above 90% from 300 nm to 1100 nm. The average solar energy absorption is 91.40% under AM 1.5 solar spectrum (300–1100 nm), and the short circuit current density (Jsc) reached 32.81 mA/cm2, which is 52.4% higher than planar SSCs (without TiO 2 IP and Ag NPs). The highest efficiency reaches 14.16%. Our solar cell has the high efficiency compared with similar solar cell reported previously. [Display omitted] • The average absorption of the SSCs has reached to 91.40% under AM 1.5 solar spectrum. • The short circuit density of the SSCs has reached to 32.81 mA/cm2, which is 52.40% higher than planar HSCs. • Nanometer thick c-silicon active layer reached 14.16% of the highest power conversion efficiency. • Ag nanoparticles and TiO 2 inverted triangular prism have excellent light-trapping effect. In this work, the absorption of solar energy of thin-film c-silicon (silicon is 1 μm) heterojunction solar cells (SSCs) with the combination of Ag nanoparticles (NPs) and TiO 2 inverted triangular prism (IP) is enhanced significantly. The top TiO 2 IP increases the short wavelengths absorption by coupling the incident light into photonic modes in the active layer. The bottom Ag NPs primarily enhances the absorption of longer wavelengths by coupling incident light into surface plasmon resonance (SPR). Thus, the average solar energy absorption is 91.40% under AM 1.5 solar spectrum. The geometries of the Ag NPs and TiO 2 IP are optimized that based on the maximum values of the J sc. The maximum J sc is 32.81 mA/cm2. The highest PCE of 14.16% is obtained in a solar cell containing the integrated structure of Ag NPs and TiO 2 IP. Besides, to further explain the mechanism of solar energy absorption by SSCs, electric field intensity distribution profiles for different structures of SSCs at different wavelengths are analyzed in both TM direction (polarization along x-direction) and TE polarizations (polarization along y-direction). [ABSTRACT FROM AUTHOR]