In order further to understand the mechanisms and to reduce the fabrication cost, experimental demonstrations of light absorption affection by adding thin metallic plasmonic layers and laser-created surface microstructures to the thin film a-Si solar cells was performed. For adding the plasmonic layer, by adjusting those structural parameters such as thicknesses of the a-Si thin layer and the thin plasmonic layer's thickness, and the incident angle, light absorption enhancement by cavity resonances and by the planar plasmonic coupling was carefully analyzed. For creating the dense microstructures on silicon surface, frequency doubled, nanosecond (nsec) Nd:YAG laser pulses in the SF_6 ambient, were used. The infrared absorption is increased to near unity and extends well below the original bandgap far into the infrared. These results are interesting to making advanced solar cells on both efficiency and cost, as comparing to previous results reported using more complicated and less economical femotosecond (fsec) titanium sapphire and picosecond (psec) and nanosecond excimer lasers.
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