Physical Vapor Deposition of High-Mobility P-Type Tellurium and Its Applications for Gate-Tunable van der Waals PN Photodiodes
Recently, tellurium has attracted resurgent interest due to its outstanding p-type characteristics and ambient environmental stability. Here, we present a substrate engineering-based physical vapor deposition method to synthesize high-quality Te nanoflakes and achieved a field-effect hole mobility of 1450 cm<sup>2</sup>/(V s), which is, to the best of our knowledge, the highest among existing synthesized two-dimensional p-type semiconductors. The high mobility of Te enables the fabrication of Te/MoS<sub>2</sub> PN diodes with highly gate-tunable characteristics. The Te/MoS<sub>2</sub> heterostructure is demonstrated to be used as visible-light photodetectors with a current responsivity up to 630 A/W, which is about 1 order of magnitude higher than one achieved using p-type Si-MoS<sub>2</sub> PN photodiodes. The photoresponse of Te/MoS<sub>2</sub> heterojunctions also exhibits strong gate tunability due to their ultrathin thickness and unique band alignment. The successful synthesis of high-mobility Te and its integration into Te/MoS<sub>2</sub> photodiodes show promise for the development of highly tunable and multifunctional photodetectors.
Authors
- Sen Lin (ORCID: https://orcid.org/0000-0002-2288-5415)
- Zexiao Wang (ORCID: https://orcid.org/0000-0002-2170-6112)
- Roger H. Kim (ORCID: https://orcid.org/0000-0003-0718-7376)
- Yibai Zhong (ORCID: https://orcid.org/0009-0007-5741-9151)
- Jingyi Zou (ORCID: https://orcid.org/0000-0002-5135-2888)
- Qing Li (ORCID: https://orcid.org/0000-0002-8023-811X)
- Jingwei Li
- Xu Zhang (ORCID: https://orcid.org/0000-0003-0474-5846)
- Han Wang (ORCID: https://orcid.org/0000-0001-5121-3362)
- Min Xu (ORCID: https://orcid.org/0009-0006-4379-5749)
- Ruixuan Wang (ORCID: https://orcid.org/0000-0002-6238-6987)
- Tianyi Huang (ORCID: https://orcid.org/0000-0001-7153-6978)
- Jinhui Cui (ORCID: https://orcid.org/0000-0003-4847-9236)
- Sheng Shen
- Zhixing Wang (ORCID: https://orcid.org/0000-0003-1074-7469)
- Kevin St. Luce
Institutions
- University of Southern California (US)
- Carnegie Mellon University (US)
Publication Details
- Journal
- ACS Applied Materials & Interfaces
- Published
- 2024-12-20
- DOI
- https://doi.org/10.1021/acsami.4c14865
- Citations
- 7
- Primary Topic
- 2D Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.82
Funders
- Pennsylvania Department of Community and Economic Development
- Carnegie Mellon University
- National Institute of General Medical Sciences
- Division of Electrical, Communications and Cyber Systems
- Division of Biological Infrastructure