Abstract
Photoluminescence (PL) conversion of Si nanoparticles by absorbing
ultraviolet (UV) lights and emitting visible ones has been used to improve the
efficiency of crystalline Si solar cells. Si nanoparticle thin films are prepared by
pulverizing porous Si in ethanol and then mixing the suspension with a SiO<sub>2</sub> sol-gel
(SOG). This SOG is spin-deposited onto the surface of the Si solar cells and dries
in air. The short-circuit current as a function of Si nanoparticle concentration is
investigated under UV illumination. The maximal increase is found at a Si
concentration of 0.1 mg/mL. At such concentration and under the irradiation of an
AM0 solar simulator, the photoelectric conversion efficiency of the crystalline Si
solar cell is relatively increased by 2.16% because of the PL conversion.
© 2012 Chinese Optics Letters
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