Controlling Injection Barriers for Ambipolar 2D Semiconductors via Quasi‐van der Waals Contacts
Abstract: Barriers that charge carriers experience while injecting into channels play a crucial role on determining the device properties of van der Waals semiconductors (vdWS). Among various strategies to control these barriers, inserting a graphene layer underneath bulk metal may be a promising choice, which is still lacking experimental verification. Here, it is demonstrated that graphene/metal hybrid structures can form quasi‐van der Waals contacts (q‐vdWC) to ambipolar vdWS, combining the advantages of individual metal and graphene contacts together. A new analysis model is adopted to define the barriers and to extract the barrier heights in ambipolar vdWS. The devices with q‐vdWC show significantly reduced Schottky barrier heights and thermionic field emission activation energies, ability of screening the influence from substrate, and Fermi level unpinning effect. Furthermore, phototransistors with these special contacts exhibit enhanced performances. The proposed graphene/metal q‐vdWC may be an effective strategy to approach the Schottky–Mott limit for vdWS.
- Standort
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Deutsche Nationalbibliothek Frankfurt am Main
- Umfang
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Online-Ressource
- Sprache
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Englisch
- Erschienen in
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Controlling Injection Barriers for Ambipolar 2D Semiconductors via Quasi‐van der Waals Contacts ; volume:6 ; number:11 ; year:2019 ; extent:9
Advanced science ; 6, Heft 11 (2019) (gesamt 9)
- Urheber
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Wang, Junjun
Wang, Feng
Wang, Zhenxing
Cheng, Ruiqing
Yin, Lei
Wen, Yao
Zhang, Yu
Li, Ningning
Zhan, Xueying
Xiao, Xiangheng
Feng, Liping
He, Jun
- DOI
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10.1002/advs.201801841
- URN
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urn:nbn:de:101:1-2022073107425173745923
- Rechteinformation
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Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
- Letzte Aktualisierung
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15.08.2025, 07:21 MESZ
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Beteiligte
- Wang, Junjun
- Wang, Feng
- Wang, Zhenxing
- Cheng, Ruiqing
- Yin, Lei
- Wen, Yao
- Zhang, Yu
- Li, Ningning
- Zhan, Xueying
- Xiao, Xiangheng
- Feng, Liping
- He, Jun
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