Authors
Antonija Grubišić Čabo, Jill A Miwa, Signe S Grønborg, Jonathon M Riley, Jens C Johannsen, Cephise Cacho, Oliver Alexander, Richard T Chapman, Emma Springate, Marco Grioni, Jeppe V Lauritsen, Phil DC King, Philip Hofmann, Søren Ulstrup
Publication date
2015/9/9
Journal
Nano letters
Volume
15
Issue
9
Pages
5883-5887
Publisher
American Chemical Society
Description
The dynamics of excited electrons and holes in single layer (SL) MoS2 have so far been difficult to disentangle from the excitons that dominate the optical response of this material. Here, we use time- and angle-resolved photoemission spectroscopy for a SL of MoS2 on a metallic substrate to directly measure the excited free carriers. This allows us to ascertain a direct quasiparticle band gap of 1.95 eV and determine an ultrafast (50 fs) extraction of excited free carriers via the metal in contact with the SL MoS2. This process is of key importance for optoelectronic applications that rely on separated free carriers rather than excitons.
Scholar articles
A Grubišić Čabo, JA Miwa, SS Grønborg, JM Riley… - Nano letters, 2015