April 22 - 26, 2024
Seattle, Washington
May 7 - 9, 2024 (Virtual)
Symposium Supporters
2024 MRS Spring Meeting & Exhibit
EL05.05.10

Scalable Synthesis of Molecular-Intercalated Bulk Monolayer MoS2 with Tailored Electron Doping

When and Where

Apr 24, 2024
11:15am - 11:30am
Room 344, Level 3, Summit

Presenter(s)

Co-Author(s)

Boxuan Zhou1,Jingyuan Zhou1,Xiangfeng Duan1

University of California Los Angeles1

Abstract

Boxuan Zhou1,Jingyuan Zhou1,Xiangfeng Duan1

University of California Los Angeles1
Molybdenum disulfide (MoS2) is an extensively studied two-dimensional layered semiconductor with interesting electronic and optical properties. Monolayer MoS2 features strong light-matter interactions due to its direct bandgap, whereas multilayer MoS2 is an indirect bandgap semiconductor and optically inactive. The molecular intercalation of MoS2 with organic cations offers a strategy to decouple the interlayer interaction, producing a bulk monolayer material, but is usually accompanied by a heavy electron doping effect that can diminish the intrinsic semiconductor properties or induce a phase transition. Herein, we report a chemical-dedoping strategy to tailor electron density in molecular-intercalated MoS2, therefore retaining monolayer properties. By introducing a poly(vinylpyrrolidone)-bromine complex during the electrochemical intercalation process, we show bulk monolayer MoS2 thin film can be produced with decoupled interlayer interaction and reduced electron concentration. The resulting thin films display strong excitonic emission, 20- and > 400 times stronger than the exfoliated monolayer and multilayer material respectively, as well as high valley polarization and enhanced photo-electric response. Our study opens a scalable path to large-area bulk monolayer MoS2 thin films with monolayer-like optical properties and greatly increased optical cross-section, presenting an attractive material platform for both fundamental photophysics studies and scalable optoelectronic applications.

Keywords

2D materials | thin film

Symposium Organizers

Silvija Gradecak, National University of Singapore
Lain-Jong Li, The University of Hong Kong
Iuliana Radu, TSMC Taiwan
John Sudijono, Applied Materials, Inc.

Symposium Support

Gold
Applied Materials

Session Chairs

Stephanie Law
Joan Redwing

In this Session