Optical investigation of the natural electron doping in thin MoS2 films deposited on dielectric substrates

Scientific Reports
D SercombeA I Tartakovskii

Abstract

Two-dimensional (2D) compounds provide unique building blocks for novel layered devices and hybrid photonic structures. However, large surface-to-volume ratio in thin films enhances the significance of surface interactions and charging effects requiring new understanding. Here we use micro-photoluminescence (PL) and ultrasonic force microscopy to explore the influence of the dielectric environment on optical properties of a few monolayer MoS2 films. PL spectra for MoS2 films deposited on SiO2 substrates are found to vary widely. This film-to-film variation is suppressed by additional capping of MoS2 with SiO2 and Si(x)N(y), improving mechanical coupling of MoS2 with surrounding dielectrics. We show that the observed PL non-uniformities are related to strong variation in the local electron charging of MoS2 films. In completely encapsulated films, negative charging is enhanced leading to uniform optical properties. Observed great sensitivity of optical characteristics of 2D films to surface interactions has important implications for optoelectronics applications of layered materials.

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Citations

Feb 5, 2016·Nano Letters·J KleinJ J Finley
Apr 19, 2016·Nano Letters·Robert SchmidtRudolf Bratschitsch
Mar 19, 2016·Advanced Materials·Renjing XuYuerui Lu
Jan 21, 2015·Nano Letters·Der-Hsien LienAli Javey
May 7, 2016·Physical Chemistry Chemical Physics : PCCP·Weitao SuLi Yang
Jul 28, 2016·Journal of Physics. Condensed Matter : an Institute of Physics Journal·S FunkeU Wurstbauer
Aug 12, 2014·Nature Nanotechnology·Chul-Ho LeePhilip Kim
Jul 31, 2018·Chemical Society Reviews·Zhiwei WangWei Huang
Feb 3, 2015·Advanced Materials·Emanuela MargapotiJonathan J Finley
Feb 21, 2018·Nature Communications·Long ZhangHui Deng
Mar 18, 2015·Scientific Reports·Longzhi YangJianyi Yang
May 5, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Flavio RicheGilmar Eugenio Marques
Oct 17, 2015·Nanotechnology·Ergun Simsek, Bablu Mukherjee
Sep 8, 2016·Advanced Materials·Bong Gyu ShinYoung Hee Lee
Nov 11, 2014·Nanoscale·Yuanyuan LiLiusi Sheng
Mar 26, 2014·ACS Nano·Rudren Ganatra, Qing Zhang
Dec 9, 2017·ACS Applied Materials & Interfaces·Yann AlmadoriBenjamin Grévin
Jun 28, 2019·The Journal of Physical Chemistry Letters·Peng FanAnlian Pan
Aug 30, 2014·Nano Letters·Shengxi HuangMildred S Dresselhaus
Sep 13, 2014·Nano Letters·Yuxuan LinTomás Palacios
Nov 7, 2014·Nano Letters·S SchwarzA I Tartakovskii

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Methods Mentioned

BETA
atomic force microscopy
AFM

Software Mentioned

UFM

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