@article{446a46d6d8484b19be40b795a3d186f3,
title = "Controlling the surface photovoltage on WSe2 by surface chemical modification",
abstract = "The surface photovoltage (SPV) effect is key to the development of opto-electronic devices such as solar-cells and photo-detectors. For the prototypical transition metal dichalcogenide WSe2, core level and valence band photoemission measurements show that the surface band bending of pristine cleaved surfaces can be readily modified by adsorption with K (an electron donor) or C60 (an electron acceptor). Time-resolved pump-probe photoemission measurements reveal that the SPV for pristine cleaved surfaces is enhanced by K adsorption, but suppressed by C60 adsorption, and yet the SPV relaxation time is substantially shortened in both cases. Evidently, adsorbate-induced electronic states act as electron-hole recombination centers that shorten the carrier lifetime.",
author = "Liu, {Ro Ya} and Kenichi Ozawa and Naoya Terashima and Yuto Natsui and Baojie Feng and Suguru Ito and Chen, {Wei Chuan} and Cheng, {Cheng Maw} and Susumu Yamamoto and Hiroo Kato and Chiang, {Tai Chang} and Iwao Matsuda",
note = "Funding Information: This work was supported by the Grant-in-Aid for Scientific Research (KAKENHI) (Grant Nos. 16H03867 and 16H06027) and the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Division of Materials Science and Engineering (Grant No. DE-FG02-07ER46383 for T.-C.C.). The experiment was carried out as a joint research in the Synchrotron Radiation Research Organization and the Institute for Solid State Physics, the University of Tokyo (Proposal Nos. 2013B7454, 2014B7480, 2016A7503, and 2016B7523). T.-C.C. received a visiting professor appointment at the University of Tokyo during the experiment. Publisher Copyright: {\textcopyright} 2018 Author(s).",
year = "2018",
month = may,
day = "21",
doi = "10.1063/1.5026351",
language = "English",
volume = "112",
journal = "Applied Physics Letters",
issn = "0003-6951",
publisher = "American Institute of Physics Publising LLC",
number = "21",
}