1
|
Han Y, Chae M, Choi D, Song I, Ko C, Cresti A, Theodorou C, Joo MK. Negative Differential Interlayer Resistance in WSe 2 Multilayers via Conducting Channel Migration with Vertical Double-Side Contacts. ACS APPLIED MATERIALS & INTERFACES 2023; 15:58605-58612. [PMID: 38051158 DOI: 10.1021/acsami.3c13699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/07/2023]
Abstract
The inherent interlayer resistance in two-dimensional (2D) van der Waals (vdW) multilayers is expected to significantly influence the carrier density profile along the thickness, provoking spatial modification and separation of the conducting channel inside the multilayers, in conjunction with the thickness-dependent carrier mobility. However, the effect of the interlayer resistance on the variation in the carrier density profile and its direction along the thickness under different electrostatic bias conditions has been elusive. Here, we reveal the presence of a negative differential interlayer resistance (NDIR) in WSe2 multilayers by considering various contact electrode configurations: (i) bottom contact, (ii) top contact, and (iii) vertical double-side contact (VDC). The contact-structure-dependent shape modification of the transconductance clearly manifests the redistribution of carrier density and indicates the direction of the conducting channel migration along the thickness. Furthermore, the distinct characteristic of the electrically tunable NDIR in 2D WSe2 multilayers is revealed by the observed discrepancy between the top- and bottom-channel resistances determined by four-probe measurements with VDC. Our results provide an optimized device layout and further insights into the distinct carrier transport mechanism in 2D vdW multilayers.
Collapse
Affiliation(s)
- Yeongseo Han
- Department of Applied Physics, Sookmyung Women's University, Seoul 04310, Republic of Korea
| | - Minji Chae
- Department of Applied Physics, Sookmyung Women's University, Seoul 04310, Republic of Korea
| | - Dahyun Choi
- Department of Applied Physics, Sookmyung Women's University, Seoul 04310, Republic of Korea
| | - Inseon Song
- Department of Applied Physics, Sookmyung Women's University, Seoul 04310, Republic of Korea
| | - Changhyun Ko
- Department of Applied Physics, Sookmyung Women's University, Seoul 04310, Republic of Korea
- Institute of Advanced Materials and Systems, Sookmyung Women's University, Seoul 04310, Republic of Korea
| | - Alessandro Cresti
- Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, Grenoble INP, IMEP-LAHC, Grenoble 38000, France
| | - Christoforos Theodorou
- Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, Grenoble INP, IMEP-LAHC, Grenoble 38000, France
| | - Min-Kyu Joo
- Department of Applied Physics, Sookmyung Women's University, Seoul 04310, Republic of Korea
- Institute of Advanced Materials and Systems, Sookmyung Women's University, Seoul 04310, Republic of Korea
| |
Collapse
|