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UV–Visible Light-Trapping Structure of Loosely Packed Submicrometer Silica Sphere for Amorphous Silicon Solar Cells

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9 Author(s)
Wen-Hsien Huang ; Dept. of Mater. Sci. & Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan ; Jia-Min Shieh ; Fu-Ming Pan ; Chang-Hong Shen
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We synthesized a loosely packed submicrometer silica-sphere (LPSS) monolayer at room temperature and used the LPSS monolayer as the frontside light-trapping structure for n-i-p-type amorphous Si (a-Si) solar cells (SCs) to improve photovoltaic characteristics of the cells. The frontside LPSS monolayer plays a role as a UV-visible light scatter and a broadband antireflector; both can greatly improve the photoresponse of the underneath a-Si adsorbed layer. When the filling density of the LPSS layer is optimized to 65%, the enhancement in the photocurrent and conversion efficiency of the 120 °C -fabricated SCs is as high as ~ 15% and ~ 6.9%, respectively. Accordingly, such an LPSS light-trapping structure boosts efficiency of 120 °C - and 140 °C-fabricated cells to 7.3% and 8.5%, respectively. Since the LPSS structure has a graded refractive index profile, it behaves like a nearly omnidirectional antireflector, enhancing solar efficiency at a very large incident angle of illumination.

Published in:

Electron Device Letters, IEEE  (Volume:33 ,  Issue: 7 )