Abstract
Graphene nano-electro-mechanical switches are promising components due to their excellent switching performance such as low pull-in voltage and low contact resistance. Mass fabrication with an appropriate counter electrode remains challenging. In this work, we report the stacking of nanocrystalline graphene (NCG) with a 70-nm dielectric separation layer. The buried NCG layer is contacted through the formation of vias and acts as actuation electrode. After metallization, the top 7.5-nm thin NCG layer is patterned to form double-clamped beams, and the structure is released by hydrofluoric acid etching. By applying a voltage between the top and buried NCG layer, a step-like current increase is observed below 1.5 V, caused by the contact of the movable beam with the buried NCG. No pull-out is observed due to the thin sacrificial layer and high beam length, resulting in low mechanical restoring force. We discuss the possible applications of the NCG stacking approach to realize nano-electro-mechanical contact switches and advanced logical components such as a AND logic.
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References
Cheng Z-L, Skouta R, Vazquez H et al (2011) In situ formation of highly conducting covalent Au–C contacts for single-molecule junctions. Nat Nanotechnol 6:353. https://doi.org/10.1038/nnano.2011.66
Dadgour HF, Banerjee K (2007) Design and analysis of hybrid NEMS–CMOS circuits for ultra low-power applications. In: 2007 44th ACM/IEEE design automation conference, pp 306–311
Feng XL, Matheny MH, Zorman CA et al (2010) Low voltage nanoelectromechanical switches based on silicon carbide nanowires. Nano Lett 10:2891–2896. https://doi.org/10.1021/nl1009734
Fishlock SJ, Grech D, McBride JW et al (2016) Mechanical characterisation of nanocrystalline graphite using micromechanical structures. Microelectron Eng 159:184–189. https://doi.org/10.1016/j.mee.2016.03.040
Geim AK, Novoselov KS (2007) The rise of graphene. Nat Mater 6:183. https://doi.org/10.1038/nmat1849
Grogg D, Drechsler U, Knoll A et al (2013) Curved in-plane electromechanical relay for low power logic applications. J Micromech Microeng 23:025024. https://doi.org/10.1088/0960-1317/23/2/025024
Hamam AMM, Schmidt ME, Muruganathan M et al (2018) Sub-10 nm graphene nano-ribbon tunnel field-effect transistor. Carbon 126:588–593. https://doi.org/10.1016/j.carbon.2017.09.091
Hammam AMM, Schmidt ME, Muruganathan M, Mizuta H (2017) Sharp switching behaviour in graphene nanoribbon p–n junction. Carbon 121:399–407. https://doi.org/10.1016/j.carbon.2017.05.097
Jothiramalingam K, Manoharan M, Schmidt ME et al (2017) Finite element method simulation of graphene nanoelectromechanical contact switches with surface trenches. In: 2017 Conference on emerging devices and smart systems (ICEDSS), pp 137–141
Kulothungan J, Muruganathan M, Mizuta H (2016) 3D finite element simulation of graphene nano-electro-mechanical switches. Micromachines 7:143. https://doi.org/10.3390/mi7080143
Lee SW, Lee DS, Morjan RE et al (2004) A three-terminal carbon nanorelay. Nano Lett 4:2027–2030. https://doi.org/10.1021/nl049053v
Lee JO, Song Y-H, Kim M-W et al (2013) A sub-1-volt nanoelectromechanical switching device. Nat Nanotechnol 8:36. https://doi.org/10.1038/nnano.2012.208
Loh OY, Espinosa HD (2012) Nanoelectromechanical contact switches. Nat Nanotechnol 7:283. https://doi.org/10.1038/nnano.2012.40
Milaninia KM, Baldo MA, Reina A, Kong J (2009) All graphene electromechanical switch fabricated by chemical vapor deposition. Appl Phys Lett 95:183105. https://doi.org/10.1063/1.3259415
Peschot A, Qian C, Liu T-JK (2015) Nanoelectromechanical switches for low-power digital computing. Micromachines 6:1046–1065. https://doi.org/10.3390/mi6081046
Sun J, Wang W, Muruganathan M, Mizuta H (2014) Low pull-in voltage graphene electromechanical switch fabricated with a polymer sacrificial spacer. Appl Phys Lett 105:033103. https://doi.org/10.1063/1.4891055
Sun J, Muruganathan M, Kanetake N, Mizuta H (2016a) Locally-actuated graphene-based nano-electro-mechanical switch. Micromachines 7:124. https://doi.org/10.3390/mi7070124
Sun J, Schmidt ME, Muruganathan M et al (2016b) Large-scale nanoelectromechanical switches based on directly deposited nanocrystalline graphene on insulating substrates. Nanoscale 8:6659–6665. https://doi.org/10.1039/C6NR00253F
Wagner TJW, Vella D (2013) Switch on, switch off: stiction in nanoelectromechanical switches. Nanotechnology 24:275501. https://doi.org/10.1088/0957-4484/24/27/275501
Wang W, Muruganathan M, Kulothungan J, Mizuta H (2017) Study of dynamic contacts for graphene nano-electromechanical switches. Jpn J Appl Phys 56:04CK05
Yaung J, Hutin L, Jeon J, Liu TJK (2014) Adhesive force characterization for MEM logic relays with sub-micron contacting regions. J Microelectromech Syst 23:198–203. https://doi.org/10.1109/JMEMS.2013.2269995
Acknowledgements
This work was supported by the Grant-in-Aid for Scientific Research no. 25220904, 16K13650, and 16K18090 from Japan Society for the Promotion of Science and the Center of Innovation (COI) program of the Japan Science and Technology Agency. The authors thank Wenzhen Wang for the experimental assistance, and Harold M. H. Chong, Zaharah Johari and Jamie Reynolds for the assistance with NCG growth.
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MES conceived the concept; MES, KJ, and AMMH performed the fabrication and electrical measurements; MES, and KJ, wrote the manuscript. MES, KJ and MM analyzed the data, discussed the results, reviewed the manuscript and contributed to the scientific interpretation; HM supervised the project.
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Jothiramalingam, K., Schmidt, M.E., Manoharan, M. et al. Stacking of nanocrystalline graphene for nano-electro-mechanical (NEM) actuator applications. Microsyst Technol 25, 3083–3089 (2019). https://doi.org/10.1007/s00542-018-4180-z
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DOI: https://doi.org/10.1007/s00542-018-4180-z