Light-illuminated Cross-sectional Scanning Tunneling Microscopy Studies of Photo-induced Carrier Generations at Heterointerfaces

Ya-Ping Chiu^1*

¹Physics, National Taiwan University, Taipei, Taiwan

* Presenter:Ya-Ping Chiu, email:ypchiu@phy.ntu.edu.tw

Novel charge transport behaviors at artificial heterointerfaces have been attracting extensive scientific attention in both materials science and fundamental condensed matter physics. Recent success in controlling the atomically sharp interfaces is approachable in heterostructures. These heterojunctions exhibit tunable energy band gap from the near-infrared to the visible region show great potential for future electronic and optoelectronic applications. Thus, to find a suitable tool to study the photoresponse of heterojunctions becomes necessary and important. The electronic characteristic of the band alignment at heterojunctions can therefore provide and determine the separation behavior of photoexcited electrons and holes in materials. In this talk, our recent research works by using light-illuminated XSTM on the interfacial properties at their nanoscale junctions will be addressed.

References:
1) Nature Communications 9 (1), 1442 (2018).
2) ACS Nano, 12 (2), 1089 (2018).
3) Nano Letters, 17(2), 1154 (2017)

Keywords: cross-sectional STM, interface, light-induced charge carrier separation