{"title":"Impact of in-plane electric field on the optical properties of CO2 adsorbed 2D MoSe2 monolayer: application as a photodetector","authors":"S. N. Jaiswal, Bramha P. Pandey","doi":"10.1007/s10825-024-02233-x","DOIUrl":null,"url":null,"abstract":"<div><p>We present the results of an investigation of the optical characteristics of pristine and CO<sub>2</sub>-adsorbed MoSe<sub>2</sub> monolayers with (without) an external electric field. The optical parameters of interest are the absorption coefficient (<i>α</i>), reflectance (<i>R</i><sub><i>f</i></sub>), refractive index (<i>n</i>), and photoconductivity (<i>σ</i>). The impact of an external electric field (−2 × 10<sup>8</sup> V/cm) on the optical behavior of the MoSe<sub>2</sub> monolayer is systematically investigated. The results show the peaks of the real component (<span>\\(\\varepsilon_{1}\\)</span>) of the dielectric function for both pristine and CO<sub>2</sub>-adsorbed MoSe<sub>2</sub> monolayers in the energy range of 2–3 eV. The imaginary part (<span>\\(\\varepsilon_{2}\\)</span>) of the dielectric function exhibits a shift toward the visible region from the ultraviolet (UV) region, in which CO<sub>2</sub> is adsorbed, and this shift increases toward the visible region with the application of an external electric field. Analysis of the absorption index, refractive index, and reflectance reveals that the peaks are aligned in the visible range for both the pristine MoSe<sub>2</sub> and CO<sub>2</sub>-adsorbed MoSe<sub>2</sub> monolayers, with (without) an external electric field. The shifts of these peaks follow a similar trend as the imaginary part of the dielectric constant. Lastly, this study provides additional insight into the photo-detection performance parameters (internal quantum efficiency [IQE], external quantum efficiency [EQE], light extraction efficiency [LEE], and responsivity) for both pristine and CO<sub>2</sub>-adsorbed MoSe<sub>2</sub> monolayers, considering the presence or absence of an external field.</p></div>","PeriodicalId":620,"journal":{"name":"Journal of Computational Electronics","volume":null,"pages":null},"PeriodicalIF":2.2000,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Computational Electronics","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1007/s10825-024-02233-x","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
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Abstract
We present the results of an investigation of the optical characteristics of pristine and CO2-adsorbed MoSe2 monolayers with (without) an external electric field. The optical parameters of interest are the absorption coefficient (α), reflectance (Rf), refractive index (n), and photoconductivity (σ). The impact of an external electric field (−2 × 108 V/cm) on the optical behavior of the MoSe2 monolayer is systematically investigated. The results show the peaks of the real component (\(\varepsilon_{1}\)) of the dielectric function for both pristine and CO2-adsorbed MoSe2 monolayers in the energy range of 2–3 eV. The imaginary part (\(\varepsilon_{2}\)) of the dielectric function exhibits a shift toward the visible region from the ultraviolet (UV) region, in which CO2 is adsorbed, and this shift increases toward the visible region with the application of an external electric field. Analysis of the absorption index, refractive index, and reflectance reveals that the peaks are aligned in the visible range for both the pristine MoSe2 and CO2-adsorbed MoSe2 monolayers, with (without) an external electric field. The shifts of these peaks follow a similar trend as the imaginary part of the dielectric constant. Lastly, this study provides additional insight into the photo-detection performance parameters (internal quantum efficiency [IQE], external quantum efficiency [EQE], light extraction efficiency [LEE], and responsivity) for both pristine and CO2-adsorbed MoSe2 monolayers, considering the presence or absence of an external field.
期刊介绍：
he Journal of Computational Electronics brings together research on all aspects of modeling and simulation of modern electronics. This includes optical, electronic, mechanical, and quantum mechanical aspects, as well as research on the underlying mathematical algorithms and computational details. The related areas of energy conversion/storage and of molecular and biological systems, in which the thrust is on the charge transport, electronic, mechanical, and optical properties, are also covered.
In particular, we encourage manuscripts dealing with device simulation; with optical and optoelectronic systems and photonics; with energy storage (e.g. batteries, fuel cells) and harvesting (e.g. photovoltaic), with simulation of circuits, VLSI layout, logic and architecture (based on, for example, CMOS devices, quantum-cellular automata, QBITs, or single-electron transistors); with electromagnetic simulations (such as microwave electronics and components); or with molecular and biological systems. However, in all these cases, the submitted manuscripts should explicitly address the electronic properties of the relevant systems, materials, or devices and/or present novel contributions to the physical models, computational strategies, or numerical algorithms.
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