MECHANISM OF ELECTRICAL CONDUCTION THROUGH SINGLE OLIGOTHIOPHENE MOLECULES

2010 ◽  
Vol 03 (04) ◽  
pp. 245-248 ◽  
Author(s):  
SEE KEI LEE ◽  
RYO YAMADA ◽  
HIROKAZU TADA ◽  
SHOJI TANAKA
Keyword(s):  
Charge Transport ◽  
Scanning Tunneling Microscope ◽  
Transport Mechanism ◽  
Electrical Conductance ◽  
Scanning Tunneling ◽  
Break Junction ◽  
Charge Transport Mechanism ◽  
Transport Mechanisms ◽  
Thermally Activated ◽  
Molecular Length

The temperature dependence of electrical conductance of oligothiophene molecules with the length of 2.2 nm (5-mer), 5.6 nm (14-mer) and 6.7 nm (17-mer) was measured by break junction method with a scanning tunneling microscope to clarify the charge transport mechanisms. The conductance of 17-mer molecule increased exponentially with temperature whereas the conductance of 5-mer and 14-mer molecules did not change. These results indicate that the dominant charge transport mechanism changed from tunneling to thermally activated hopping at molecular length around 6.7 nm (17-mer).

Observation of the transition from tunneling to hopping carrier transport through single oligothiophene molecules

2008 ◽  
Vol 1091 ◽  
Author(s):  
Ryo Yamada ◽  
Hiroaki Kumazawa ◽  
Shoji Tanaka ◽  
Hirokazu Tada
Keyword(s):  
Linear Dependence ◽  
Transport Mechanism ◽  
Carrier Transport ◽  
Electrical Conductance ◽  
Break Junction ◽  
Carrier Transport Mechanism ◽  
Molecular Length

AbstractElectrical conductance of single oligothiophene molecules with a length in the range from 2 to 9 nm was measured as a function of molecular length by a break junction method. The resistance of oligothiophenes increased exponentially from 5-mer to 14-mer while that of molecules longer than 17-mer showed linear dependence on their length. These results indicated that the carrier transport mechanism changed from tunneling to hopping around 14-mer of which the length is approximately 6 nm.

NOISE AS A PROBE OF THE CHARGE TRANSPORT MECHANISMS THROUGH THIN OXIDES IN MOS STRUCTURES

2001 ◽  
Vol 01 (02) ◽  
pp. L61-L64
Author(s):  
F. CRUPI ◽  
C. CIOFI ◽  
C. PACE ◽  
G. IANNACCONE ◽  
B. NERI
Keyword(s):  
Charge Transport ◽  
Shot Noise ◽  
Transport Mechanism ◽  
Charge Transport Mechanism ◽  
Transport Mechanisms ◽  
Conduction Mechanisms ◽  
Noise Characterization ◽  
Mos Structures

In this letter, we will show that the current through the oxide in MOS structures is not always characterized by full shot noise, as it is generally assumed. We will report different noise behaviors associated to different conduction mechanisms through the oxide and we will discuss a case where the noise characterization has been used as a powerful probe of the charge transport mechanism, thus resulting in the discrimination between the several proposed models.

Electrical Conductance of Single Oligothiophene Molecular Wires: Temperature Effect

2011 ◽  
Vol 1286 ◽  
Author(s):  
See Kei Lee ◽  
Ryo Yamada ◽  
Shoji Tanaka ◽  
Hirokazu Tada
Keyword(s):  
Transport Mechanism ◽  
Carrier Transport ◽  
Electrical Conductance ◽  
Molecular Wires ◽  
Scanning Tunneling ◽  
Molecular Junction ◽  
Break Junction ◽  
Charge Carrier Transport ◽  
Tunneling Microscopy ◽  
Hopping Transport

ABSTRACTWe investigated temperature dependence of the electrical conductance of single oligothiophene molecular wires with the length of 2.2 nm (5-mer), 5.6 nm (14-mer) and 6.7 nm (17-mer) by using the scanning tunneling microscopy break junction method. Results show that the dominant charge carrier transport for 5-mer molecule is tunneling while for 17-mer molecule is hopping. The carrier transport mechanism of 14-mer are tunneling transport (T ≤ 350 K) and hopping transport (T > 350 K) indicating that hopping and tunnelling transport are competitive process in the molecular junction.

scholarly journals Connectivity dependent thermopower of bridged biphenyl molecules in single-molecule junctions

Nanoscale ◽  
2020 ◽  
Vol 12 (27) ◽  
pp. 14682-14688 ◽  
Author(s):  
Iain M. Grace ◽  
Gunnar Olsen ◽  
Juan Hurtado-Gallego ◽  
Laura Rincón-García ◽  
Gabino Rubio-Bollinger ◽  
...  
Keyword(s):  
Seebeck Coefficient ◽  
Single Molecule ◽  
Scanning Tunneling Microscope ◽  
Electrical Conductance ◽  
Scanning Tunneling ◽  
Break Junction ◽  
Tunneling Microscope ◽  
Single Molecule Junctions

We report measurements on gold|single-molecule|gold junctions, using a modified scanning tunneling microscope-break junction (STM-BJ) technique, of the Seebeck coefficient and electrical conductance of a series of bridged biphenyl molecules.

scholarly journals Charge transport mechanism in copper phthalocyanine thin films with and without traps

RSC Advances ◽  
2017 ◽  
Vol 7 (86) ◽  
pp. 54911-54919 ◽  
Author(s):  
Varsha Rani ◽  
Akanksha Sharma ◽  
Pramod Kumar ◽  
Budhi Singh ◽  
Subhasis Ghosh
Keyword(s):  
Thin Films ◽  
Charge Transport ◽  
Grain Boundaries ◽  
Transport Mechanism ◽  
Copper Phthalocyanine ◽  
Organic Thin Films ◽  
Interface States ◽  
Charge Transport Mechanism ◽  
Density Of Interface States

We investigate the charge transport mechanism in copper phthalocyanine thin films with and without traps. We find that the density of interface states at the grain boundaries can decide the mechanism of charge transport in organic thin films.

Charge transport mechanism in amorphous alumina

2009 ◽  
Vol 94 (22) ◽  
pp. 222904 ◽  
Author(s):  
Yu. N. Novikov ◽  
V. A. Gritsenko ◽  
K. A. Nasyrov
Keyword(s):  
Charge Transport ◽  
Transport Mechanism ◽  
Charge Transport Mechanism ◽  
Amorphous Alumina

Charge transport mechanism analysis of Al/CdS:Sr2+/ITO device under dark and light

2016 ◽  
Author(s):  
Joydeep Datta ◽  
Mrinmay Das ◽  
Arka Dey ◽  
Rajkumar Jana ◽  
Partha Pratim Ray
Keyword(s):  
Charge Transport ◽  
Transport Mechanism ◽  
Mechanism Analysis ◽  
Charge Transport Mechanism
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