Thermal Breakdown of ZnTe Nanowires

Davami, Keivan; Ghassemi, Hessam; Yassar, Reza S.; Lee, Jeong Soo; Meyyappan, M.

doi:10.1002/cphc.201100486

Cited by 13 publications

(5 citation statements)

References 22 publications

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“…Although the voltages, positions of breakdown and electromigration effects can be very different for in situ TEM studies with a TEM-STM setup compared to those of our set-up or conventional (non-in situ) measurements, the breakdown mechanism is likely to be similar. Indeed several authors report the formation of balls (Ga, B, Zn and Te) [4,6,8,9].…”

Section: Discussionmentioning

confidence: 99%

“…Obviously, high stability of these NWs is required if they are to be used. Electrical characterizations of NWs have been made mostly by making metallic contacts in a top-down approach [4][5][6] and sometimes by in situ TEM making contact on one side of the NWs with an STM tip [4,[7][8][9][10][11][12]. Several mechanisms are reported for the onset of the breakdown due to a high current: compositional changes or decomposition due to heating, and electromigration.…”

Section: Introductionmentioning

confidence: 99%

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In situelectrical characterization of tapered InAs nanowires in a transmission electron microscope with ohmic contacts

et al. 2015

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The electrical properties of segments of tapered InAs nanowires (NWs) were investigated by in situ transmission electron microscopy with simultaneous I-V measurements using good ohmic contacts, thus excluding experimental artefacts as Joule heating caused by high-resistivity contacts. At low voltage the resistivity of InAs NWs with a diameter larger than 120 nm is constant (∼10(-2) Ω · cm). When the current is strongly increased a breakdown of the NW occurs close to the cathode side, whereby the main changes are an electromigration of In and a sublimation of As. The critical current density for breakdown was close to 10(6) A cm(-2) in most cases. A Joule heating and electromigration mechanism for the breakdown process is proposed.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In situelectrical characterization of tapered InAs nanowires in a transmission electron microscope with ohmic contacts

et al. 2015

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“…As soon as the electric current begins to flow in the NEM switch contact, it causes thermal heating in the switching element and may result in small structural modifications of the contacting surfaces, welding and even change of the chemical composition of the contacting materials. Electrical-current-induced thermal effects have been studied in various one-dimensional nanostructures such as Si [ 92 ], Ge [ 10 , 54 ], carbon nanotubes (CNTs) [ 93 – 95 ], GaN [ 96 – 97 ] and ZnTe [ 98 ].…”

Section: Reviewmentioning

confidence: 99%

Review: Electrostatically actuated nanobeam-based nanoelectromechanical switches – materials solutions and operational conditions

Jasulaneca¹,

Kosmača²,

Meija³

et al. 2018

Beilstein J. Nanotechnol.

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This review summarizes relevant research in the field of electrostatically actuated nanobeam-based nanoelectromechanical (NEM) switches. The main switch architectures and structural elements are briefly described and compared. Investigation methods that allow for exploring coupled electromechanical interactions as well as studies of mechanically or electrically induced effects are covered. An examination of the complex nanocontact behaviour during various stages of the switching cycle is provided. The choice of the switching element and the electrode is addressed from the materials perspective, detailing the benefits and drawbacks for each. An overview of experimentally demonstrated NEM switching devices is provided, and together with their operational parameters, the reliability issues and impact of the operating environment are discussed. Finally, the most common NEM switch failure modes and the physical mechanisms behind them are reviewed and solutions proposed.

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“…As tellurides of Zn, Cd, Pb and Bi have become popular for thermoelectric applications, a thorough characterization of their electrical and mechanical properties is needed. 33,34 We have investigated the size dependency of Young's modulus of ZnTe NWs here through bending tests in a TEM-AFM setup and also using computer simulations. The experimental method was used for NWs with diameters of 50-230 nm and the computational method was limited to NWs less than 20 nm in diameter due to computational efficiency.…”

Section: Discussionmentioning

confidence: 99%

A computational and experimental investigation of the mechanical properties of single ZnTe nanowires

et al. 2012

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One-dimensional nanostructures such as ZnTe, CdTe, Bi(2)Te(3) and others have attracted much attention in recent years for their potential in thermoelectric devices among other applications. A better understanding of their mechanical properties is important for the design of devices. A combined experimental and computational approach has been used here to investigate the size effects on the Young's modulus of ZnTe nanowires (NWs). The mechanical properties of individual ZnTe nanowires in a wide diameter range (50-230 nm) were experimentally measured inside a high resolution transmission electron microscope using an atomic force microscope probe with the ability to record in situ continuous force-displacement curves. The in situ observations showed that ZnTe NWs are flexible nanostructures with the ability to withstand relatively high buckling forces without becoming fractured. The Young's modulus is found to be independent of nanowire diameter in the investigated range, in contrast to reported results for ZnO NWs and carbon nanotubes where the modulus increases with a decrease in diameter. Molecular dynamics simulations performed for nanowires with diameters less than 20 nm show limited size dependence for diameters smaller than 5 nm. The surface atoms present lower Young's modulus according to the simulations and the limited size dependency of the cylindrical ZnTe NWs is attributed to the short range covalent interactions.

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Thermal Breakdown of ZnTe Nanowires

Cited by 13 publications

References 22 publications

In situelectrical characterization of tapered InAs nanowires in a transmission electron microscope with ohmic contacts

In situelectrical characterization of tapered InAs nanowires in a transmission electron microscope with ohmic contacts

Review: Electrostatically actuated nanobeam-based nanoelectromechanical switches – materials solutions and operational conditions

A computational and experimental investigation of the mechanical properties of single ZnTe nanowires

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