Near-unity photoluminescence quantum yield in MoS2

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

541 Scopus Citations
View graph of relations


  • Matin Amani
  • Der-Hsien Lien
  • Daisuke Kiriya
  • Jun Xiao
  • Angelica Azcatl
  • Jiyoung Noh
  • Surabhi R. Madhvapathy
  • Rafik Addou
  • KC Santosh
  • Madan Dubey
  • Kyeongjae Cho
  • Robert M. Wallace
  • Si-Chen Lee
  • Joel W. Ager III
  • Xiang Zhang
  • Eli Yablonovitch
  • Ali Javey


Original languageEnglish
Pages (from-to)1065-1068
Journal / PublicationScience
Issue number6264
Publication statusPublished - 27 Nov 2015
Externally publishedYes


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 finalQYofmore 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.

Citation Format(s)

Near-unity photoluminescence quantum yield in MoS2. / Amani, Matin; Lien, Der-Hsien; Kiriya, Daisuke; Xiao, Jun; Azcatl, Angelica; Noh, Jiyoung; Madhvapathy, Surabhi R.; Addou, Rafik; Santosh, KC; Dubey, Madan; Cho, Kyeongjae; Wallace, Robert M.; Lee, Si-Chen; He, Jr-Hau; Ager III, Joel W.; Zhang, Xiang; Yablonovitch, Eli; Javey, Ali.

In: Science, Vol. 350, No. 6264, 27.11.2015, p. 1065-1068.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal