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Selected Works of Santosh KC
Article
Near-unity photoluminescence quantum yield in MoS2
Science (2015)
  • Santosh KC, University of Texas at Dallas
  • Matin Amani, University of California - Berkeley
  • Der-Hsien Lien, University of California - Berkeley
  • Daisuke Kiriya, University of California - Berkeley
  • Jun Xiao, University of California - Berkeley
  • Angelica Azcatl, University of Texas at Dallas
  • Jiyoung Noh, University of Texas at Dallas
  • Surabhi R. Madhvapathy, University of California - Berkeley
  • Rafik Addou, The University of Texas at Dallas
  • Madan Dubey, U.S. Army Research Laboratory
  • Kyeongjae Cho, The University of Texas at Dallas
  • Robert M. Wallace, University of Texas at Dallas
  • Si-Chen Lee, National Taiwan University
  • Jr-Hau He, King Abdullah University of Science and Technology
  • Joel W. Ager, III, Lawrence Berkeley National Laboratory
  • Xiang Zhang, University of California - Berkeley
  • Eli Yablonovitch, University of California - Berkeley
  • Ali Javey, University of California - Berkeley
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Abstract
Two-dimensional (2D) transition metal dichalcogenides have emerged as a promising material system for optoelectronic applications, but their primary figure of merit, the room-temperature photoluminescence quantum yield (QY), is extremely low. The prototypical 2D material molybdenum disulfide (MoS2) is reported to have a maximum QY of 0.6%, which indicates a considerable defect density. Here we report on an air-stable, solution-based chemical treatment by an organic superacid, which uniformly enhances the photoluminescence and minority carrier lifetime of MoS2 monolayers by more than two orders of magnitude. The treatment eliminates defect-mediated nonradiative recombination, thus resulting in a final QY of more than 95%, with a longest-observed lifetime of 10.8 ± 0.6 nanoseconds. Our ability to obtain optoelectronic monolayers with near-perfect properties opens the door for the development of highly efficient light-emitting diodes, lasers, and solar cells based on 2D materials.
Disciplines
Publication Date
November 27, 2015
DOI
10.1126/science.aad2114
Publisher Statement
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Citation Information
Santosh KC, Matin Amani, Der-Hsien Lien, Daisuke Kiriya, et al.. "Near-unity photoluminescence quantum yield in MoS2" Science Vol. 350 Iss. 6264 (2015) p. 1065 - 1068
Available at: http://works.bepress.com/santosh-kc/16/