Optical and Structural Properties of 100 MeV Fe~(9+) ion Irradiated InP

摘要

Single crystal InP samples were irradiated with 100 MeV Fe~(9+) ions for ion fluences 1x10~(12) and 1x10~(13) cm~(-2). Optical properties of irradiated InP was investigated by Spectroscopic Ellipsometry and UV-VIS-NIR spectroscopy. The optical parameters like, refractive index, extinction coefficient, absorption coefficient is found to be fluence dependent near the surface as well as near the projected range. Small change in the optical parameters near the surface region as investigated by Spectroscopic Ellipsometry indicatesthat the surfaces of irradiated InP are similar to non-irradiated InP. This is also supported by RBS/C measurements. The UV-VIS-NIR study revealed the decrease in the band gap and increase in the defect concentration in the irradiated sample as a result of nuclear energy loss.