Frank Laboratory of Neutron Physics

Department of Nuclear Physics

Leader – E.V. Lychagin

Date and Time: Wednesday, 14 March 2018, at 11:00 AM

Venue: Conference Hall, Frank Laboratory of Neutron Physics

Seminar topic: «Chemical composition of the near surface layers of implanted GaAs»

Speaker: Dorota Kołodyńska (MCSU, Lublin, Poland, associate professor with over 20 years’ experience in inorganic chemistry and environmental protection)

Abstract:

The chemical composition and optical properties of the near surface layers of implanted GaAs are discussed. The GaAs samples were implanted with In+, Ne+ or Kr+ ions using UNIMAS system and then thermally annealed. There were used the following investigation methods: the Rutherford backscattering spectrometry analyses (RBS) and nuclear reaction (NR) using EG5, spectroscopic ellipsometry (SE) and X-ray photoelectron spectroscopy (XPS) using XPS UHV system to characterize the chemical composition of the near surface layers and optical properties of the GaAs. Due to displacement of Ga ions from GaAs by the In+ ions the new chemical compound InAs was formed. Additionally, the ellipsometric measurements show that SE method is very sensitive, rapid and non-destructive and first of all very useful for describing the evaluation process related to the damaged forms of the implanted GaAs.