Transmittance values for wavelengths shorter than 1240nm are very low (Table 1), with both untreated and treated silicon behaving the same as far as transmittance is
concerned. In terms of reflectance, the solar component has been optimized for the visible part of the solar spectrum. Below the band gap, reflectance is considerably reduced for treated silicon (Table 1). The minimum value is around 500nm, which is the maximum for solar irradiance.