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Ding EX, Liu P, Yoon HH, Ahmed F, Du M, Shafi AM, Mehmood N, Kauppinen EI, Sun Z, Lipsanen H. Highly Sensitive MoS 2 Photodetectors Enabled with a Dry-Transferred Transparent Carbon Nanotube Electrode. ACS APPLIED MATERIALS & INTERFACES 2023; 15:4216-4225. [PMID: 36635093 PMCID: PMC9880956 DOI: 10.1021/acsami.2c19917] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/05/2022] [Accepted: 01/05/2023] [Indexed: 06/17/2023]
Abstract
Fabricating electronic and optoelectronic devices by transferring pre-deposited metal electrodes has attracted considerable attention, owing to the improved device performance. However, the pre-deposited metal electrode typically involves complex fabrication procedures. Here, we introduce our facile electrode fabrication process which is free of lithography, lift-off, and reactive ion etching by directly press-transferring a single-walled carbon nanotube (SWCNT) film. We fabricated Schottky diodes for photodetector applications using dry-transferred SWCNT films as the transparent electrode to increase light absorption in photoactive MoS2 channels. The MoS2 flake vertically stacked with an SWCNT electrode can exhibit excellent photodetection performance with a responsivity of ∼2.01 × 103 A/W and a detectivity of ∼3.2 × 1012 Jones. Additionally, we carried out temperature-dependent current-voltage measurement and Fowler-Nordheim (FN) plot analysis to explore the dominant charge transport mechanism. The enhanced photodetection in the vertical configuration is found to be attributed to the FN tunneling and internal photoemission of charge carriers excited from indium tin oxide across the MoS2 layer. Our study provides a novel concept of using a photoactive MoS2 layer as a tunneling layer itself with a dry-transferred transparent SWCNT electrode for high-performance and energy-efficient optoelectronic devices.
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Affiliation(s)
- Er-Xiong Ding
- Department
of Electronics and Nanoengineering, School of Electrical Engineering, Aalto University, EspooFI-02150, Finland
| | - Peng Liu
- Department
of Electronics and Nanoengineering, School of Electrical Engineering, Aalto University, EspooFI-02150, Finland
- Department
of Applied Physics, School of Science, Aalto
University, EspooFI-02150, Finland
| | - Hoon Hahn Yoon
- Department
of Electronics and Nanoengineering, School of Electrical Engineering, Aalto University, EspooFI-02150, Finland
| | - Faisal Ahmed
- Department
of Electronics and Nanoengineering, School of Electrical Engineering, Aalto University, EspooFI-02150, Finland
| | - Mingde Du
- Department
of Electronics and Nanoengineering, School of Electrical Engineering, Aalto University, EspooFI-02150, Finland
| | - Abde Mayeen Shafi
- Department
of Electronics and Nanoengineering, School of Electrical Engineering, Aalto University, EspooFI-02150, Finland
| | - Naveed Mehmood
- Department
of Electronics and Nanoengineering, School of Electrical Engineering, Aalto University, EspooFI-02150, Finland
| | - Esko I. Kauppinen
- Department
of Applied Physics, School of Science, Aalto
University, EspooFI-02150, Finland
| | - Zhipei Sun
- Department
of Electronics and Nanoengineering, School of Electrical Engineering, Aalto University, EspooFI-02150, Finland
| | - Harri Lipsanen
- Department
of Electronics and Nanoengineering, School of Electrical Engineering, Aalto University, EspooFI-02150, Finland
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2
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Yoon HH, Fernandez HA, Nigmatulin F, Cai W, Yang Z, Cui H, Ahmed F, Cui X, Uddin MG, Minot ED, Lipsanen H, Kim K, Hakonen P, Hasan T, Sun Z. Miniaturized spectrometers with a tunable van der Waals junction. Science 2022; 378:296-299. [PMID: 36264793 DOI: 10.1126/science.add8544] [Citation(s) in RCA: 45] [Impact Index Per Article: 22.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Miniaturized computational spectrometers, which can obtain incident spectra using a combination of device spectral responses and reconstruction algorithms, are essential for on-chip and implantable applications. Highly sensitive spectral measurement using a single detector allows the footprints of such spectrometers to be scaled down while achieving spectral resolution approaching that of benchtop systems. We report a high-performance computational spectrometer based on a single van der Waals junction with an electrically tunable transport-mediated spectral response. We achieve high peak wavelength accuracy (∼0.36 nanometers), high spectral resolution (∼3 nanometers), broad operation bandwidth (from ∼405 to 845 nanometers), and proof-of-concept spectral imaging. Our approach provides a route toward ultraminiaturization and offers unprecedented performance in accuracy, resolution, and operation bandwidth for single-detector computational spectrometers.
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Affiliation(s)
- Hoon Hahn Yoon
- Department of Electronics and Nanoengineering, Aalto University, Espoo 02150, Finland.,QTF Centre of Excellence, Department of Applied Physics, Aalto University, Aalto 00076, Finland
| | - Henry A Fernandez
- Department of Electronics and Nanoengineering, Aalto University, Espoo 02150, Finland.,QTF Centre of Excellence, Department of Applied Physics, Aalto University, Aalto 00076, Finland
| | - Fedor Nigmatulin
- Department of Electronics and Nanoengineering, Aalto University, Espoo 02150, Finland.,QTF Centre of Excellence, Department of Applied Physics, Aalto University, Aalto 00076, Finland
| | - Weiwei Cai
- Key Lab of Education Ministry for Power Machinery and Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Zongyin Yang
- College of Information Science and Electronic Engineering and State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China
| | - Hanxiao Cui
- School of Aeronautics and Astronautics, Sichuan University, Chengdu 610065, China
| | - Faisal Ahmed
- Department of Electronics and Nanoengineering, Aalto University, Espoo 02150, Finland
| | - Xiaoqi Cui
- Department of Electronics and Nanoengineering, Aalto University, Espoo 02150, Finland.,QTF Centre of Excellence, Department of Applied Physics, Aalto University, Aalto 00076, Finland
| | - Md Gius Uddin
- Department of Electronics and Nanoengineering, Aalto University, Espoo 02150, Finland.,QTF Centre of Excellence, Department of Applied Physics, Aalto University, Aalto 00076, Finland
| | - Ethan D Minot
- Department of Physics, Oregon State University, Corvallis, OR 97331, USA
| | - Harri Lipsanen
- Department of Electronics and Nanoengineering, Aalto University, Espoo 02150, Finland
| | - Kwanpyo Kim
- Department of Physics, Yonsei University, Seoul 03722, Republic of Korea
| | - Pertti Hakonen
- QTF Centre of Excellence, Department of Applied Physics, Aalto University, Aalto 00076, Finland
| | - Tawfique Hasan
- Cambridge Graphene Centre, University of Cambridge, Cambridge CB3 0FA, UK
| | - Zhipei Sun
- Department of Electronics and Nanoengineering, Aalto University, Espoo 02150, Finland.,QTF Centre of Excellence, Department of Applied Physics, Aalto University, Aalto 00076, Finland
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3
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Kiemle J, Powalla L, Polyudov K, Gulati L, Singh M, Holleitner AW, Burghard M, Kastl C. Gate-Tunable Helical Currents in Commensurate Topological Insulator/Graphene Heterostructures. ACS NANO 2022; 16:12338-12344. [PMID: 35968692 DOI: 10.1021/acsnano.2c03370] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
van der Waals heterostructures made from graphene and three-dimensional topological insulators promise very high electron mobilities, a nontrivial spin texture, and a gate-tunability of electronic properties. Such a combination of advantageous electronic characteristics can only be achieved through proximity effects in heterostructures, as graphene lacks a large enough spin-orbit interaction. In turn, the heterostructures are promising candidates for all-electrical control of proximity-induced spin phenomena. Here, we explore epitaxially grown interfaces between graphene and the lattice-matched topological insulator Bi2Te2Se. For this heterostructure, spin-orbit coupling proximity has been predicted to impart an anisotropic and electronically tunable spin texture. Polarization-resolved second-harmonic generation, Raman spectroscopy, and time-resolved magneto-optic Kerr microscopy are combined to demonstrate that the atomic interfaces align in a commensurate symmetry with characteristic interlayer vibrations. By polarization-resolved photocurrent measurements, we find a circular photogalvanic effect which is drastically enhanced at the Dirac point of the proximitized graphene. We attribute the peculiar gate-tunability to the proximity-induced interfacial spin structure, which could be exploited for, e.g., spin filters.
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Affiliation(s)
- Jonas Kiemle
- Walter Schottky Institut and Physics Department, Technical University of Munich, Am Coulombwall 4a, 85748 Garching, Germany
- MCQST, Schellingstrasse 4, 80799 München, Germany
| | - Lukas Powalla
- Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany
| | - Katharina Polyudov
- Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany
| | - Lovish Gulati
- Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany
| | - Maanwinder Singh
- Walter Schottky Institut and Physics Department, Technical University of Munich, Am Coulombwall 4a, 85748 Garching, Germany
- MCQST, Schellingstrasse 4, 80799 München, Germany
| | - Alexander W Holleitner
- Walter Schottky Institut and Physics Department, Technical University of Munich, Am Coulombwall 4a, 85748 Garching, Germany
- MCQST, Schellingstrasse 4, 80799 München, Germany
| | - Marko Burghard
- Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany
| | - Christoph Kastl
- Walter Schottky Institut and Physics Department, Technical University of Munich, Am Coulombwall 4a, 85748 Garching, Germany
- MCQST, Schellingstrasse 4, 80799 München, Germany
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