DPG Phi
Verhandlungen
Verhandlungen
DPG

Dresden 2014 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

DS: Fachverband Dünne Schichten

DS 39: Focus Session: Resistive Switching by Redox and Phase Change Phenomena VI (Kinetics and Transport in PC materials)

DS 39.5: Talk

Thursday, April 3, 2014, 10:45–11:00, CHE 89

Structure and Transport Properties of Pseudo Ternary SnTe, GeTe, Sb2Te3 Chalcogenides — •Felix R. L. Lange1, Stefan Jakobs1, Tim Labohm1, Jan Kirchhof1, Tobias Schäfer1, K. Simon Siegert1, and Matthias Wuttig1,21I. Physikalisches Institut (IA), RWTH Aachen University, 52056 Aachen, Germany — 2JARA - Fundamentals of Information Technology, RWTH Aachen University, 52056 Aachen, Germany

Ternary chalcogenides along the line between GeTe and Sb2Te3 have caught interest due to their high degree of disorder in the crystalline phase. Only recently Siegrist et al. reported an insulator-to-metal transition in the crystalline phase [1]. Depending on the annealing temperature of the thin films the electrical resistivity is either thermally activated or develops metallic at elevated temperatures. While little change is noticed on the carrier concentration the electrical resistance spans over six orders of magnitude at room temperature. Based on DFT calculations Zhang et al. identified clusters of vacancies to localize the wave functions responsible for charge transport in the early meta-stable cubic phase [2]. Dissolution of these clusters upon annealing then leads to a delocalization of the corresponding wave functions concomitant with the transition to the metallic state. Here we explore pseudo ternary alloys of SnTe, GeTe and Sb2Te3 in order to utilize both, stoichiometry and annealing condition to adjust the degree of disorder concomitant with tailored transport properties.
T. Siegrist et al., Nat. Mater. 10, 202-208 (2011)
W. Zhang et al., Nat. Mater. 11, 952-956 (2012)

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2014 > Dresden