{"id":7078,"date":"2019-08-13T00:00:01","date_gmt":"2019-08-12T16:00:01","guid":{"rendered":"https:\/\/www.science.nus.edu.sg\/?p=7078"},"modified":"2020-03-02T16:52:53","modified_gmt":"2020-03-02T08:52:53","slug":"control-of-excitons-in-a-2d-semiconductor","status":"publish","type":"post","link":"https:\/\/www.science.nus.edu.sg\/blog\/2019\/08\/control-of-excitons-in-a-2d-semiconductor\/","title":{"rendered":"Control of excitons in a 2D semiconductor"},"content":{"rendered":"<p><span style=\"font-family: arial, helvetica, sans-serif\">NUS scientists have developed a method to control the binding energies of excitons in a two-dimensional (2D) semiconductor for advanced photonic and optoelectronic applications.<\/span><\/p>\n<p><span style=\"font-family: arial, helvetica, sans-serif\">The optical properties of atomically thin 2D semiconductors such as monolayer transition metal dichalcogenides (TMDs) are dominated by excitons. These are quasiparticles of tightly bound electron-hole pairs. Understanding the excitonic effects and controlling the exciton binding energies in 2D semiconductors are important in unlocking their full potential for use in a variety of technical applications.<\/span><\/p>\n<p><span style=\"font-family: arial, helvetica, sans-serif\">A research team led by Prof LU Jiong, Department of Chemistry, NUS has developed a method to control the excitons in a thin layer of rhenium diselenide (ReSe<sub>2<\/sub>), by adjusting the electron density in the underlying graphene film using the electrostatic gating effect. Electrostatic gating is a method to modify the carrier concentration of atomically thin 2D materials by the application of an electric field. The researchers used a field effect transistor device consisting of a monolayer of ReSe<sub>2<\/sub>\u00a0on a back-gated graphene film for their experiments. An increase (decrease) of electron carrier density in the graphene film will decrease (increase) the Coulomb interaction strength between the interacting electron-hole pairs (excitons) in the ReSe<sub>2<\/sub>\u00a0layer. By controlling the electron carrier concentration in the underlying graphene substrate, the researchers could control the electronic bandgap and exciton binding energy of the monolayer ReSe<sub>2<\/sub>\u00a0by up to hundreds of mili-electronvolts (meV).<\/span><\/p>\n<p><span style=\"font-family: arial, helvetica, sans-serif\">In their experiments, the researchers demonstrated that the exciton binding energy of the monolayer ReSe<sub>2<\/sub>\u00a0can be continuously tuned from 460 meV to 680 meV by electrostatic gating. Unlike the conventional doping method, in which impurities are doped into the semiconductors to change their material properties, electrostatic gating has the flexibility for continuous tunability of the exciton binding energy as well as excellent compatibility for integration in modern device technology.<\/span><\/p>\n<p><span style=\"font-family: arial, helvetica, sans-serif\">Prof Lu said, \u201cThe ability to precisely tune the bandgap and excitonic effects of 2D semiconductors on graphene devices could provide new insights into the band alignment and exciton dissociation at the interface of 2D semiconductors and graphene. This could potentially reduce the interface contact resistance and improve the light-harvesting efficiency of such optoelectronic devices.\u201d<\/span><\/p>\n<p><span style=\"font-family: arial, helvetica, sans-serif\"><img decoding=\"async\" src=\"https:\/\/www.science.nus.edu.sg\/wp-content\/uploads\/2020\/01\/206._Lu_Jiong_CHM_20190716_2.jpg\" alt=\"\" \/><\/span><\/p>\n<p><span style=\"font-family: arial, helvetica, sans-serif\">Figure shows (a) schematic illustration of a monolayer rhenium diselenide (ReSe<sub>2<\/sub>) on a back-gated graphene\/ hexagonal boron nitride device. (b) Atomic structure of a monolayer ReSe<sub>2<\/sub>. The red lines show the lattice vectors (<em>a\u00a0<\/em>and\u00a0<em>b<\/em>). (c) Scanning tunnelling microscopy (STM) image of a monolayer ReSe<sub>2<\/sub>. The inset shows the line profile obtained by the STM along the step edge. (d) Atomically-resolved STM image of monolayer ReS<sub>e2<\/sub>. [Credit: Science Advances]<\/span><\/p>\n<p><span style=\"font-family: arial, helvetica, sans-serif\"><strong>Reference<\/strong><\/span><\/p>\n<p><span style=\"font-family: arial, helvetica, sans-serif\">Qiu Z; Trushin M; Fang H; Verzhbitskiy I; Gao S; Laksono E; Yang M; Lyu P; Li J; Su J; Telychko M; Watanabe K; Taniguchi T; Wu J; Neto AHC; Yang L; Eda G; Adam S; Lu J*, &#8220;Giant gate-tunable bandgap renormalization and excitonic effects in a 2D semiconductor&#8221;, SCIENCE ADVANCES Volume:5 Number 7 DOI: 10.1126\/sciadv.aaw2347\u00a0 Published: 2019.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>NUS scientists have developed a method to control the binding energies of excitons in a two-dimensional (2D) semiconductor for advanced&#8230;<\/p>\n","protected":false},"author":1,"featured_media":8829,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[23,13],"tags":[],"class_list":["post-7078","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-advanced-materials","category-research-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.6 (Yoast SEO v23.6) - 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