Baojuan Xin, Boyan Li, Wen Yang, Luyan Li, Hong Dong, Yahui Cheng, Hui Liu, Wei-Hua Wang, Feng Lu
{"title":"Electronic structures and quantum capacitance of twisted mixed-dimensional van der Waals heterostructures of graphene/C2H based on tight-binding model","authors":"Baojuan Xin, Boyan Li, Wen Yang, Luyan Li, Hong Dong, Yahui Cheng, Hui Liu, Wei-Hua Wang, Feng Lu","doi":"10.1088/2053-1583/ad2caa","DOIUrl":null,"url":null,"abstract":"Constructing twisted mixed dimensional graphene-based van der Waals heterostructure (vdWH) is an effective strategy to manipulate the electronic structures and improve the quantum capacitance (<italic toggle=\"yes\">C</italic>\n<sub>q</sub>) of graphene. In this work, mixed dimensional vdWH of graphene/C<sub>2</sub>H has been proposed owing to similar Dirac semimetal character of one-dimensional C<sub>2</sub>H with that of graphene. Meanwhile, the influence of twisting angle (<italic toggle=\"yes\">θ</italic>) and interlayer interaction strength on the electronic structures and the <italic toggle=\"yes\">C</italic>\n<sub>q</sub> of the MD vdWH are systemically explored based on tight binding model. With the fitted hopping integral parameters, it is found that the linear dispersion of the graphene is basically preserved but the bandwidth is decreased with modulating twisting angle and interlayer interaction, and the <italic toggle=\"yes\">C</italic>\n<sub>q</sub> of mixed dimensional vdWH is improved 5–19 times compared with graphene at zero bias. Moreover, the compressed strain could enhance the <italic toggle=\"yes\">C</italic>\n<sub>q</sub> of mixed dimensional vdWH to 74.57 <italic toggle=\"yes\">μ</italic>F cm<sup>−2</sup> at zero bias and broaden the low working voltage window of mixed-dimensional vdWH with considerable <italic toggle=\"yes\">C</italic>\n<sub>q</sub>. Our results provide suitable tight-binding model parameters and theoretical guidance for exploring the twisted MD vdWH of graphene/C<sub>2</sub>H and offer an effective strategy to modulate the electronic structures and the <italic toggle=\"yes\">C</italic>\n<sub>q</sub> of graphene through constructing the MD vdWH.","PeriodicalId":6812,"journal":{"name":"2D Materials","volume":"68 1","pages":""},"PeriodicalIF":4.5000,"publicationDate":"2024-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2D Materials","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1088/2053-1583/ad2caa","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Constructing twisted mixed dimensional graphene-based van der Waals heterostructure (vdWH) is an effective strategy to manipulate the electronic structures and improve the quantum capacitance (Cq) of graphene. In this work, mixed dimensional vdWH of graphene/C2H has been proposed owing to similar Dirac semimetal character of one-dimensional C2H with that of graphene. Meanwhile, the influence of twisting angle (θ) and interlayer interaction strength on the electronic structures and the Cq of the MD vdWH are systemically explored based on tight binding model. With the fitted hopping integral parameters, it is found that the linear dispersion of the graphene is basically preserved but the bandwidth is decreased with modulating twisting angle and interlayer interaction, and the Cq of mixed dimensional vdWH is improved 5–19 times compared with graphene at zero bias. Moreover, the compressed strain could enhance the Cq of mixed dimensional vdWH to 74.57 μF cm−2 at zero bias and broaden the low working voltage window of mixed-dimensional vdWH with considerable Cq. Our results provide suitable tight-binding model parameters and theoretical guidance for exploring the twisted MD vdWH of graphene/C2H and offer an effective strategy to modulate the electronic structures and the Cq of graphene through constructing the MD vdWH.
期刊介绍:
2D Materials is a multidisciplinary, electronic-only journal devoted to publishing fundamental and applied research of the highest quality and impact covering all aspects of graphene and related two-dimensional materials.