Characterization of Contact Resistance between Carbon Nanotubes Film and Metal Electrodes

2013 ◽  
Vol 683 ◽  
pp. 238-241
Author(s):  
Ki Bong Han ◽  
Yong Ho Choi
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Contact Resistance ◽  
Chemical Properties ◽  
Metal Electrode ◽  
Metal Contacts ◽  
Metal Electrodes ◽  
3 Dimensional ◽  
Current Path ◽  
Classical Technique

Carbon nanotube has attracted great research attentions due to its outstanding electrical, physical, mechanical, chemical properties. Based on its excellent properties, the carbon nanotube is promising nanoscale material for novel electrical, mechanical, chemical, and biological devices and sensors. However, it is very difficult to control the structure of carbon nanotube during synthesis. A carbon nanotubes film has 3 dimensional structures of interwoven carbon nanotubes as well as unique properties such as transparency, flexibility and good electrical conductivity. More importantly, the properties of carbon nanotubes are ensemble averaged in this formation. In this research, we study the contact resistance between carbon nanotubes film and metal electrode. For most of electrical devices using carbon nanotubes film, it is necessary to have metal electrodes on the film for current path. A resistance at the contact lowers the electrical efficiencies of the devices. Therefore, it is important to measure and characterize the contact resistance and lower it for better efficiencies. The device demonstrated in this study using classical technique for metal contacts provides relatively reliable contact resistance measurements for carbon nanotubes film applications.

Carbon nanotubes to outperform metal electrodes in perovskite solar cells via dopant engineering and hole-selectivity enhancement

2020 ◽  
Vol 8 (22) ◽  
pp. 11141-11147 ◽  
Author(s):  
Il Jeon ◽  
Ahmed Shawky ◽  
Seungju Seo ◽  
Yang Qian ◽  
Anton Anisimov ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Solar Cells ◽  
Carbon Nanotube ◽  
Perovskite Solar Cells ◽  
Metal Electrode ◽  
Doping Effect ◽  
Triflic Acid ◽  
Metal Electrodes ◽  
Apolar Solvent

Triflic acid dispersed in an apolar solvent exhibited a superior doping effect and stability on carbon nanotube electrodes. The carbon nanotube electrode-based perovskite solar cells exceeded the metal electrode-based counterpart in terms of efficiency.

Quantum Transport in Nanotube-Based Structures

2001 ◽  
Vol 706 ◽  
Author(s):  
M. Buongiorno Nardelli ◽  
J.-L. Fattebert ◽  
J. Bernholc
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Contact Resistance ◽  
Transport Properties ◽  
Quantum Transport ◽  
State Of The Art ◽  
Electronic Devices ◽  
Quantum Calculations ◽  
Metal Contacts ◽  
Electromechanical Systems

AbstractUsing state of the art quantum calculations, we have studied the electronic and transport properties of a variety of nanotube-based structures relevant for the design of nanoscale electronic devices. We have investigated the conductance of carbon nanotubes under mechanica distortions such as bending, defects and tube-tube contacts, and analyzed the behavior of carbon nanotube-metal contacts with the aim of explaining the anomalously large contact resistance observed in nanotube devices. Our results provide a clear interpretation of recent experimenta findings and suggest avenues for the use of carbon nanotubes in electromechanical systems.

Carbon Nanotube Composites

2019 ◽  
Vol 23 ◽  
pp. 75-81
Author(s):  
Ponnusamy Senthil Kumar ◽  
G. Janet Joshiba
Keyword(s):  
Carbon Nanotubes ◽  
Tensile Strength ◽  
Carbon Nanotube ◽  
Chemical Properties ◽  
Market Demand ◽  
Size Dependent ◽  
Nanotube Composites ◽  
Carbon Nanotube Composites ◽  
Physical And Chemical ◽  
And Chemical Properties

The discovery of carbon nanotubes is one of the remarkable achievement in the field of material science and it is a great advancement of Nanotechnology. A carbon nanotube is an expedient material used in several domains and paves way for the welfare of humans in many ways. Carbon nanotubes are nanosized tubes made from graphitic carbons and it is well known for its exclusive physical and chemical properties. The market demand for the nanotubes has increased progressively due to its size dependent, structure and mechanical properties. The carbon nanotubes possess high tensile strength and it is also found to be the durable fibre ever known. It is also found to possess exceptional electrical properties. The carbon nanotube composites have an excellent young’s modulus and higher tensile strength same as graphite carbon. This review plots the properties of carbon nanotubes and portrays the planning and properties of carbon nanotube composites. The wide application of carbon nanotube composites is also explained.

scholarly journals Positioning of the Fermi Level in Graphene Devices with Asymmetric Metal Electrodes

2010 ◽  
Vol 2010 ◽  
pp. 1-5 ◽  
Author(s):  
Bum-Kyu Kim ◽  
Eun-Kyoung Jeon ◽  
Ju-Jin Kim ◽  
Jeong-O Lee
Keyword(s):  
Fermi Level ◽  
Dirac Point ◽  
Metal Electrode ◽  
Peak Position ◽  
Metal Contacts ◽  
Metal Electrodes ◽  
Hole Band ◽  
Graphene Devices ◽  
Hybrid Devices ◽  
Bias Range

To elucidate the effect of the work function on the position of the Dirac point, we fabricated graphene devices with asymmetric metal contacts. By measuring the peak position of the resistance for each pair of metal electrodes, we obtained the voltage of the Dirac pointVgDirac(V) from the gate response. We found that the position ofVgDirac(V) in the hybrid devices was significantly influenced by the type of metal electrode. The measured shifts inVgDirac(V) were closely related to the modified work functions of the metal-graphene complexes. Within a certain bias range, the Fermi level of one of the contacts aligned with the electron band and that of the other contact aligned with the hole band.

An Approach to Improving the Morphology and Reliability of n-SiC Ohmic Contacts to SiC Using Second-Metal Contacts

2006 ◽  
Vol 527-529 ◽  
pp. 859-862 ◽  
Author(s):  
Matthew H. Ervin ◽  
Kenneth A. Jones ◽  
Un Chul Lee ◽  
Taniya Das ◽  
M.C. Wood
Keyword(s):  
Electrical Properties ◽  
Contact Resistance ◽  
Ohmic Contact ◽  
Ohmic Contacts ◽  
Chemical Properties ◽  
Physical Contact ◽  
Metal Contacts ◽  
Critical Feature ◽  
Excess Carbon ◽  
Ohmic Contact Formation

While nickel ohmic contacts to n-type silicon carbide have good electrical properties, the physical contact, and therefore the reliability, can be poor. An approach is described for using the good electrical properties of Ni ohmic contacts while using another metal for its desired mechanical, thermal and/or chemical properties. In the present work, once the Ni contacts have been annealed forming nickel silicides and achieving low contact resistance, they are etched off. Removing the primary Ni contacts also eliminates the poor morphology, voids, and at least some of the excess carbon produced by the Ni/SiC reaction. The Ni contacts are then replaced by a second contact metal. This second metal displays low contact resistance as-deposited, indicating that the critical feature responsible for the ohmic contact has not been removed by the primary contact etch. Not only does this approach provide more flexibility for optimizing the contact for a given application, it also provides some insight into the ohmic contact formation mechanism.

Atomic-Scale Physics and Modeling of Schottky Barrier Effect in Carbon Nanotube Nanoelectronics

2004 ◽  
Vol 858 ◽  
Author(s):  
Yongqiang Xue
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Electron Transport ◽  
Transport Properties ◽  
Schottky Barrier ◽  
Channel Length ◽  
Atomic Scale ◽  
Barrier Effect ◽  
Metal Electrodes ◽  
Self Consistent

ABSTRACTWe present an atomistic self-consistent study of the electronic and transport properties of semiconducting carbon nanotubes in contact with metal electrodes at different contact geometries. We analyze the Schottky barrier effect at the metal-nanotube interface by examining the electrostatics, the band line up and the conductance of the metal-nanotube wire-metal junction as a function of the nanotube channel length, which leads to an effective decoupling of interface and bulk effects in electron transport through nanotube junction devices.

Self-aligned Split Gate Electrodes Fabricated on Suspended Carbon Nanotubes

2002 ◽  
Vol 741 ◽  
Author(s):  
S.-B. Lee ◽  
L.A.W. Robinson ◽  
K.B.K. Teo ◽  
M. Chhowalla ◽  
G.A.J. Amaratunga ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Multiwalled Carbon Nanotube ◽  
Metal Electrodes ◽  
Multiwalled Carbon ◽  
Gate Electrodes ◽  
Lithography Step ◽  
Lift Off ◽  
And Control ◽  
Contact Electrodes

ABSTRACTWe describe the fabrication of self-aligned split gate electrodes on suspended multiwalled carbon nanotube structures. A suspended multiwalled carbon nanotube structure was used as an evaporation mask for the deposition of metal electrodes resulting in the formation of discontinuous wire deposition. The metal deposits on the nanotubes are removed with lift-off due to the poor adhesion of metal to the nanotube surface. Using Al sacrificial layers, it was possible to fabricate self-aligned contact electrodes and control electrodes nanometers from the suspended carbon nanotubes with a single lithography step. It was also shown that the fabrication technique may also be used to form nano-gaped contact electrodes. The technique should prove useful for the fabrication of nano-electromechanical systems.

An Effective Method for Bonding Carbon Nanotubes onto Metal Electrodes

2011 ◽  
Vol 403-408 ◽  
pp. 1099-1102
Author(s):  
Qiang Lv ◽  
Ming Xiang Chen ◽  
Hui Cao ◽  
Zhi Yin Gan
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Resistivity ◽  
Contact Resistance ◽  
Relative Permeability ◽  
Induction Heating ◽  
Large Scale ◽  
Heating Process ◽  
Metal Electrodes ◽  
Good Contact

An effective method was used to bond carbon nanotubes onto metal electrodes by induction heating process. A good contact between carbon nanotubes and metal electrodes was formed. The contact resistance can be reduced to approximate 95% after induction heating process. Because the induction heating process will selective occur on the structures with high relative permeability and low electrical resistivity, this method could be utilized to realize large scale localized bonding.

Preliminary Measurements of Selective Sensing of DMMP and NH3 Using CNTFET Array Based Gas Sensors Fabricated Using Metal Diversified Electrodes for Electronic Fingerprinting

2008 ◽  
Vol 1081 ◽  
Author(s):  
Paolo Bondavalli ◽  
Pierre Legagneux ◽  
Didier Pribat
Keyword(s):  
Carbon Nanotubes ◽  
Work Function ◽  
Schottky Barrier ◽  
Gas Adsorption ◽  
Field Effect Transistors ◽  
Metal Electrode ◽  
Single Wall Carbon Nanotubes ◽  
Metal Contacts ◽  
Ambient Conditions ◽  
Metal Work Function

AbstractThis paper deals with preliminary measurements for prove-of-concept of a Carbon Nanotubes Field Effect Transistors (CNTFETs) based sensor array which could improve dramatically gas selectivity. CNTFET based sensors exploit the extremely sensitive change of the Schottky barrier heights between Single Wall Carbon NanoTubes (SWCNTs) and drain/source metal electrodes: the gas adsorption creates an interfacial dipole that modifies the metal work function and so the bending and the height of the Schottky barrier at the contacts [1,2]. Using CNTFET array fabricated using SWCNT mat as channel, we have achieved a sort of electronic fingerprinting of different gases. Actually, we want to demonstrate that the change of the metal electrode work function strictly depends on the metal/gas interaction : CNTFET transfer characteristics will change specifically as a function of this interaction. In this study we have fabricated different CNTFETs using three metal contacts (Au, Pd, Mo) and exposed them to two gases, DMMP and NH3, which have the same “electron-withdrawing” behavior. The CNTFETs array has been exposed to 1ppm of DMMP and 10ppm NH3 and we have identified two electronic fingerprinting. The totality of our measures have been performed at ambient conditions.

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