AOFSRR 2015 in conjunction with User Meeting 2015

Photoemission study on local phase transition of MoTe2

27 Nov 2015, 13:30

45m

National Centre for Synchrotron Science

Board: AM-14

Poster Advanced Materials Poster Session 2

Speaker

Dr Jaeyoon Baik (Pohang Accelerator Laboratory, South Korea)

Description

We investigate local phase transition of MoTe2 using scanning photoemission electron spectroscopy. In spite of many effort of realizing ohmic-contacted heterostuctures between 2-dimensional atomic materials, inherent limitation in the transfer method or chemical doping method, such as impurities, inhomogeneous junction and so on, has not allowed true ohmic contact due to a large interface resistance. In this work, phase transition from the 2H to 1T' phase in MoTe2 was driven by laser-irradiation, where this system allow us clean homogeneous homojunction ohmic contact between semiconducting 2H- and metallic 1T'-MoTe2 with low interface resistance. Here we verified the laser irradiation induced the phase transition by analyzing the Mo and Te 3d core-level spectrum on each micron-domain area.