Efficient defect healing of transition metal dichalcogenides by phthalocyanines

Hye Young Ahn, G. H. Lee

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


We present that a thin layer of phthalocyanine (Pc) molecules can efficiently improve the optical quality of defective MoSe2 grown by CVD method. Since MoSe2 flakes are coupled with Pc molecules through van der Waals force, the structural change can be minimized, but the pristine properties can be significantly recovered. This defect healing effect can be achieved via ultrathin coverage of Pc molecules using a simple solution-mediated process. We also observed that Pc molecules with nanometer-scale lateral dimensions is useful in suppression of point defects commonly observed in mechanically exfoliated 2D TMDCs when it is improperly annealed at sub-decomposition temperatures.

Original languageEnglish
Title of host publication2D Photonic Materials and Devices II
EditorsArka Majumdar, Carlos M. Torres, Hui Deng
ISBN (Electronic)9781510624825
StatePublished - 1 Jan 2019
Event2D Photonic Materials and Devices II 2019 - San Francisco, United States
Duration: 6 Feb 20197 Feb 2019

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


Conference2D Photonic Materials and Devices II 2019
CountryUnited States
CitySan Francisco


  • CVD growth
  • Defect healing
  • Metal phthalocyanine
  • Transition metal dichalcogenides

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