Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session Z20: Non-Carbon 2D materials III
11:30 AM–1:54 PM,
Friday, March 10, 2023
Room: Room 212
Sponsoring
Unit:
DCMP
Chair: Christopher Hooley, Univ of St Andrews
Abstract: Z20.00007 : Manipulation and characterization of nanometer sized WS2/MoS2 heterostructures on graphene
12:42 PM–12:54 PM
Presenter:
Valentino Jadrisko
(Politecnico di Milano)
Author:
Valentino Jadrisko
(Politecnico di Milano)
The large, continuous graphene layer beneath the TMD HSs allows for the transfer from Ir(111) to a SiO2/Si wafer. AFM of the transferred HS reveals mostly uniform height across the sample area of interest. Micro-Raman spectroscopy confirms the presence of the TMD HS on SiO2/Si wafer and fluorescence spectroscopy reveals the characteristic exciton resonances which blueshift approaching the low temperature (4.2 K) limit, confirming its semiconducting nature [2]. Comparison of optical bandgap with STS measurements of quasiparticle bandgap gives the value of binding energy for both WS2 and MoS2 exciton A.
Wide-field hyperspectral fluorescence microscopy yields spatially and spectrally resolved images of the sample revealing spectrally homogeneous areas over hundreds of microns.
The combination of MBE growth and electrochemical delamination transfer technique provides a controllable and scalable new method of preparing 2D materials on any desirable surface suitable for application in electronic and optoelectronic devices.
[1] B. Pielic et al 2021 “Electronic structure of quasi-freestanding WS2/MoS2 heterostructures” ACS Appl. Mater. Interfaces 2021, 13, 42, 50552–50563, 10.1021/acsami.1c15412
[2] K. P. O’Donnel, X. Chen, Appl. Phys. Lett. 58, 2924 (1991);
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