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Bandgap Renormalization in Monolayer MoS2 on CsPbBr3 Quantum Dots via Charge Transfer at Room Temperature

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Title
Bandgap Renormalization in Monolayer MoS2 on CsPbBr3 Quantum Dots via Charge Transfer at Room Temperature
Author(s)
Subash Adhikari; Ji-Hee Kim; Bumsub Song; Manh-Ha Doan; Minh Dao Tran; Leyre Gomez; Hyun Kim; Hamza Zad Gul; Ganesh Ghimire; Seok Joon Yun; Tom Gregorkiewicz; Young Hee Lee
Subject
bandgap renormalization, ; charge transfer, ; CsPbBr3 quantum dots, ; MoS2 monolayers, ; room temperature
Publication Date
2020-11
Journal
ADVANCED MATERIALS INTERFACES, v.7, no.21, pp.2000835
Publisher
WILEY
Abstract
Copyright © 1999-2020 John Wiley & Sons, Inc. All rights reserved Many‐body effect and strong Coulomb interaction in monolayer transition metal dichalcogenides lead to intrinsic bandgap shrinking, originating from the renormalization of electrical/optical bandgap, exciton binding energy, and spin‐orbit splitting. This renormalization phenomenon has been commonly observed at low temperature and requires high photon excitation density. Here, the augmented bandgap renormalization (BGR) in monolayer MoS2 anchored on CsPbBr3 perovskite quantum dots at room temperature via charge transfer is presented. The amount of electrons significantly transferred from perovskite gives rise to the large plasma screening in MoS2. The bandgap in heterostructure is red‐shifted by 84 meV with minimal pump fluence, the highest BGR in monolayer MoS2 at room temperature, which saturates with a further increase of pump fluence. Further, it is found that the magnitude of BGR inversely relates to Thomas–Fermi screening length. This provides plenty of room to explore the BGR within existing vast libraries of large bandgap van der Waals heterostructure toward practical devices such as solar cells, photodetectors, and light‐emitting‐diodes.
URI
https://pr.ibs.re.kr/handle/8788114/7567
DOI
10.1002/admi.202000835
ISSN
2196-7350
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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