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DS: Fachverband Dünne Schichten

DS 17: Ion and Electron Beam Induced Processes

DS 17.9: Talk

Tuesday, April 1, 2014, 16:00–16:15, CHE 91

Formation of PbTe nano particle by low energy ion beam mixing of Te/Pb bilayer — •Srashti Gupta^1,2, Dinesh Agarwal³, Saif Khan³, Sonathi Neeleshwar², Sunil Ohja³, Ambuj Tripathi³, S Amirthapandian⁴, Binaya Panigrahi⁴, and Devesh Avasthi³ — ¹II. Physikalisches Institut, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany — ²University School of Basic and Applied Sciences, G.G.S. Indraprastha University, Delhi- 110075, India — ³Inter University Accelerator Centre, New Delhi-110067, India — ⁴Materials Physics Division, Indira Gandhi Centre for Atomic Research, Kalpakkam-603102, India

The present work reports the formation of PbTe by low energy ion beam mixing of Te/Pb bilayer. Te/Pb bilayer samples are deposited using thermal evaporation technique with thicknesses (20 nm each) where Te is the top layer. These bilayer samples are irradiated at room temperature by 90 keV Ar and 140 keV Kr ion irradiation at different fluences ranging from 3*10¹⁵ ions/cm2 to 3*10¹⁶ ions/cm². The samples are characterized by resonant Rutherford backscattering spectrometry (RRBS) and reveal that PbTe starts forming at initial fluence of 3*10¹⁵ ions/cm2, and at fluence of 5*10¹⁵ ions/cm2 complete mixing takes place. RRBS also indicates the desorption of oxygen during irradiation. High-resolution transmission electron microscopy (HRTEM) and X-ray diffraction (XRD) are used to confirm the PbTe phase formation. HRTEM also confirms the formation of PbTe nanocrystals of 3-5 nm by Kr ion irradiation at fluence of 7*10¹⁵ ions/cm2.