Journal
ACS NANO
Volume 6, Issue 8, Pages 7044-7052Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn302090t
Keywords
ambipolar FET; single-molecule junction; electrochemical gate; PTCDI; STM
Categories
Funding
- National Science Foundation [CHE-1105588, CHE-0931466, ECS-0925498]
- Spanish Ministry of Economy and Competitiveness
- EU [FP7-PEOPLE-2010-RG-277182]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1105558, 0931466] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [0925498] Funding Source: National Science Foundation
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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.
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