R&D: Vacuum Arc Ion Source for Indium and Tin Ions Implantation Into PCM Thin Films

Review of Scientific Instruments has published an article written by Dmitry Seleznev, Alexander Kozlov, Timur Kulevoy, Alexey Sitnikov, National Research Center ‘Kurchatov Institute’-ITEP, 117218 Moscow, Russia, Petr Lazarenko, National Research University of Electronic Technology, 124498 Zelenograd, Russia, Yuri Vorobyov, Ryazan State Radio Engineering University, 390005 Ryazan, Russia, Mikhail Smayev, Mendeleev University of Chemical Technology of Russia, 125047 Moscow, Russia, and Lebedev Physical Institute of RAS, 119991 Moscow, Russia, Alexey Yakubov, Alexey Sherchenkov, National Research University of Electronic Technology, 124498 Zelenograd, Russia, and Sergey Kozyukhin, Kurnakov Institute of General and Inorganic Chemistry of RAS, 119991 Moscow, Russia.

Abstract: “One of the most prospective electrical and optical nonvolatile memory types is the phase change memory based on chalcogenide materials, particularly Ge₂Sb₂Te₅. Introduction of dopants is an effective method for the purposeful change of Ge₂Sb₂Te₅ thin film properties. In this work, we used the ion implantation method for the introduction of In and Sn into Ge₂Sb₂Te₅ thin films by a Multipurpose Test Bench (MTB) at the National Research Center ‘Kurchatov Institute’-Institute for Theoretical and Experimental Physics. For Sn and In ion implantation into Ge₂Sb₂Te₅, the following MTB elements were used: a vacuum arc ion source, an electrostatic focusing system, and a system for current and beam profile measurements. The MTB parameters for Sn and In ion implantation and its effect on the material properties are presented. Implanted Ge₂Sb₂Te₅ thin films were irradiated by femtosecond laser pulses. It was shown that the ion implantation resulted in a decrease in the threshold laser fluence necessary for crystallization compared to the undoped Ge₂Sb₂Te_5.“