Abstract
Charge transport is studied in single-molecule junctions formed with a 1,7-pyrrolidine-substituted 3,4,9,10-perylenetetracarboxylic diimide (PTCDI) molecular block using an electrochemical gate. Compared to an unsubstituted-PTCDI block, spectroscopic and electrochemical measurements indicate a reduction in the highest occupied (HOMO)-lowest unoccupied (LUMO) molecular orbital energy gap associated with the electron donor character of the substituents. The small HOMO-LUMO energy gap allows for switching between electron- and hole-dominated charge transports as a function of gate voltage, thus demonstrating a single-molecule ambipolar field-effect transistor. Both the unsubstituted and substituted molecules display similar n-type behaviors, indicating that they share the same n-type conduction mechanism. However, the substituted-PTCDI block shows a peak in the source-drain current vs gate voltage characteristics for the p-type transport, which is attributed to a two-step incoherent transport via the HOMO of the molecule.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 7044-7052 |
| Number of pages | 9 |
| Journal | ACS Nano |
| Volume | 6 |
| Issue number | 8 |
| DOIs | |
| State | Published - Aug 28 2012 |
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Keywords
- ambipolar FET
- electrochemical gate
- PTCDI
- single-molecule junction
- STM
ASJC Scopus subject areas
- Engineering(all)
- Materials Science(all)
- Physics and Astronomy(all)
Cite this
Ambipolar transport in an electrochemically gated single-molecule field-effect transistor. / Díez-Pérez, Ismael; Li, Zhihai; Guo, Shaoyin; Madden, Christopher; Huang, Helin; Che, Yanke; Yang, Xiaomei; Zang, Ling; Tao, Nongjian.
In: ACS Nano, Vol. 6, No. 8, 28.08.2012, p. 7044-7052.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Ambipolar transport in an electrochemically gated single-molecule field-effect transistor
AU - Díez-Pérez, Ismael
AU - Li, Zhihai
AU - Guo, Shaoyin
AU - Madden, Christopher
AU - Huang, Helin
AU - Che, Yanke
AU - Yang, Xiaomei
AU - Zang, Ling
AU - Tao, Nongjian
PY - 2012/8/28
Y1 - 2012/8/28
N2 - Charge transport is studied in single-molecule junctions formed with a 1,7-pyrrolidine-substituted 3,4,9,10-perylenetetracarboxylic diimide (PTCDI) molecular block using an electrochemical gate. Compared to an unsubstituted-PTCDI block, spectroscopic and electrochemical measurements indicate a reduction in the highest occupied (HOMO)-lowest unoccupied (LUMO) molecular orbital energy gap associated with the electron donor character of the substituents. The small HOMO-LUMO energy gap allows for switching between electron- and hole-dominated charge transports as a function of gate voltage, thus demonstrating a single-molecule ambipolar field-effect transistor. Both the unsubstituted and substituted molecules display similar n-type behaviors, indicating that they share the same n-type conduction mechanism. However, the substituted-PTCDI block shows a peak in the source-drain current vs gate voltage characteristics for the p-type transport, which is attributed to a two-step incoherent transport via the HOMO of the molecule.
AB - Charge transport is studied in single-molecule junctions formed with a 1,7-pyrrolidine-substituted 3,4,9,10-perylenetetracarboxylic diimide (PTCDI) molecular block using an electrochemical gate. Compared to an unsubstituted-PTCDI block, spectroscopic and electrochemical measurements indicate a reduction in the highest occupied (HOMO)-lowest unoccupied (LUMO) molecular orbital energy gap associated with the electron donor character of the substituents. The small HOMO-LUMO energy gap allows for switching between electron- and hole-dominated charge transports as a function of gate voltage, thus demonstrating a single-molecule ambipolar field-effect transistor. Both the unsubstituted and substituted molecules display similar n-type behaviors, indicating that they share the same n-type conduction mechanism. However, the substituted-PTCDI block shows a peak in the source-drain current vs gate voltage characteristics for the p-type transport, which is attributed to a two-step incoherent transport via the HOMO of the molecule.
KW - ambipolar FET
KW - electrochemical gate
KW - PTCDI
KW - single-molecule junction
KW - STM
UR - http://www.scopus.com/inward/record.url?scp=84865588626&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84865588626&partnerID=8YFLogxK
U2 - 10.1021/nn302090t
DO - 10.1021/nn302090t
M3 - Article
C2 - 22789617
AN - SCOPUS:84865588626
VL - 6
SP - 7044
EP - 7052
JO - ACS Nano
JF - ACS Nano
SN - 1936-0851
IS - 8
ER -