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en:ar [2012/05/09 05:57]
deinega [Geometric optics approximation]
en:ar [2012/07/20 19:45] (current)
valuev
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-Textured coatings have antireflective properties for wavelengths much smaller then texture size as well.+Textured coatings have antireflective properties for wavelengths much smaller than texture size as well.
 In this case reflection reduction can be illustrated geometrically: rays should be reflected many times until being reverted back.  In this case reflection reduction can be illustrated geometrically: rays should be reflected many times until being reverted back. 
 At the same time transmitted rays deviate from the incident direction that leads to light trapping effect used in solar cells.  At the same time transmitted rays deviate from the incident direction that leads to light trapping effect used in solar cells. 
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 Using antireflective coatings is one of the way to increase efficiency of solar cells. Using antireflective coatings is one of the way to increase efficiency of solar cells.
-For this purpose one can use multi-layered coatings and coatings with porous silicon, which act like film with gradually changing refractive index due to increasing porosity with the depth.+For this purpose multi-layered coatings or coatings with porous silicon can be used. Coatings with porous silicon act like film with gradually changing refractive index if porosity is increasing with the depth.
 However, as we discussed above, these types of coatings are not so easy to produce. However, as we discussed above, these types of coatings are not so easy to produce.
  
-Alternative way to reduce reflectance is using nanotextured coatings.+Nanotextured coatings is alternative way for reflection reduction.
 These coatings can be produced using lithographic technique or etching. These coatings can be produced using lithographic technique or etching.
-Their use in solar technology leads reducing reflection from the surface of the solar cell by 1 or 2 orders of magnitude.+Their use in solar technology reduces reflection from the surface of the solar cell by 1 or 2 orders of magnitude.
  
-Below we present comparison between experimental data and FDTD results for reflectance from chosen textured surface taken from here+Below we present comparison between experimental data and FDTD results for reflectance from chosen textured surface taken from 
 [[http://www.opticsinfobase.org/abstract.cfm?URI=josaa-28-5-770|http]]  [[http://www.opticsinfobase.org/abstract.cfm?URI=josaa-28-5-770|http]] 
 {{:deinega_-_minimizing_light_reflection_from_dielectric_textured_surfaces.pdf|PDF}} {{:deinega_-_minimizing_light_reflection_from_dielectric_textured_surfaces.pdf|PDF}}
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-In order to model dispersive dielectric permittivity of Silicon in FDTD, one can use technique described in section [[fitting]].+In order to model dispersive dielectric permittivity of silicon in FDTD, one can use technique described in section [[fitting]].
 
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