Near-unity photoluminescence quantum yield in MoS.sub.2
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 poor. The prototypical 2D material, MoS.sub.2 is reported to have a maximum QY of 0.6% which indicates a considerable defect density. We report on an air-stable solution-based chemical treatment by an organic superacid which uniformly enhances the photoluminescence and minority carrier lifetime of MoS.sub.2 monolayers by over two orders of magnitude. The treatment eliminates defect-mediated non-radiative recombination, thus resulting in a final QY of over 95% with a longest observed lifetime of 10.8.+-.0.6 nanoseconds. Obtaining perfect optoelectronic monolayers opens the door for highly efficient light emitting diodes, lasers, and solar cells based on 2D materials.
- Inventors:
- Issue Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1414939
- Patent Number(s):
- 9852927
- Application Number:
- 15/294,707
- Assignee:
- The Regents of the University of California (Oakland, CA)
- Patent Classifications (CPCs):
-
C - CHEMISTRY C09 - DYES C09K - MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01L - SEMICONDUCTOR DEVICES
- DOE Contract Number:
- AC02-05CH11231
- Resource Type:
- Patent
- Resource Relation:
- Patent File Date: 2016 Oct 15
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Amani, Matin, Lien, Der-Hsien, Kiriya, Daisuke, Bullock, James, and Javey, Ali. Near-unity photoluminescence quantum yield in MoS.sub.2. United States: N. p., 2017.
Web.
Amani, Matin, Lien, Der-Hsien, Kiriya, Daisuke, Bullock, James, & Javey, Ali. Near-unity photoluminescence quantum yield in MoS.sub.2. United States.
Amani, Matin, Lien, Der-Hsien, Kiriya, Daisuke, Bullock, James, and Javey, Ali. Tue .
"Near-unity photoluminescence quantum yield in MoS.sub.2". United States. https://www.osti.gov/servlets/purl/1414939.
@article{osti_1414939,
title = {Near-unity photoluminescence quantum yield in MoS.sub.2},
author = {Amani, Matin and Lien, Der-Hsien and Kiriya, Daisuke and Bullock, James and Javey, Ali},
abstractNote = {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 poor. The prototypical 2D material, MoS.sub.2 is reported to have a maximum QY of 0.6% which indicates a considerable defect density. We report on an air-stable solution-based chemical treatment by an organic superacid which uniformly enhances the photoluminescence and minority carrier lifetime of MoS.sub.2 monolayers by over two orders of magnitude. The treatment eliminates defect-mediated non-radiative recombination, thus resulting in a final QY of over 95% with a longest observed lifetime of 10.8.+-.0.6 nanoseconds. Obtaining perfect optoelectronic monolayers opens the door for highly efficient light emitting diodes, lasers, and solar cells based on 2D materials.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2017},
month = {12}
}
Works referenced in this record:
Exfoliation of Thermoelectric Materials and Transition Metal Dichalcogenides Using Ionic Liquids
patent-application, January 2015
- Wang, Hung-Ta; Frazier, Rachel; Guo, Lingling
- US Patent Application 14/317614; 20150004733