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Gate-induced superconductivity in a solution-processed organic polymer film
J H Schön1, A Dodabalapur, Z Bao
1Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974, USA. hendrik@lucent.com
Nature
|March 10, 2001
Summary
Researchers achieved superconductivity in a polythiophene polymer, a significant advancement for organic electronics. This breakthrough demonstrates the potential for tuning conjugated polymers from insulating to superconducting states.
Area of Science:
- Materials Science
- Organic Electronics
- Condensed Matter Physics
Background:
- Conjugated polymers are explored as low-cost alternatives to metals and inorganic semiconductors.
- Charge transport in these polymers is understood in metallic and semiconducting states, but superconductivity remains unobserved.
- Organic materials offer potential for novel electronic applications due to their unique properties.
Purpose of the Study:
- To investigate the possibility of achieving superconductivity in conjugated polymers.
- To explore the relationship between polymer self-organization and electrical properties.
- To demonstrate the tunability of electrical properties in polythiophene.
Main Methods:
- Fabrication of a polymer field-effect transistor using solution-cast regioregular poly(3-hexylthiophene).
- Characterization of electrical conductivity and charge carrier mobility at various temperatures.
- Induction of superconductivity at low temperatures (below 2.35 K) and high sheet carrier densities (>2.5 x 10^14 cm^-2).
Main Results:
- A distinct metal-insulator transition was observed in the polythiophene film.
- Metallic conductivity levels were achieved, with high charge carrier mobility at room temperature.
- Superconductivity was demonstrated in the polymer film below 2.35 K.
- Disorder was found to suppress superconductivity, indicating a link to polymer self-assembly.
Conclusions:
- Superconductivity is achievable in conjugated polymers, specifically regioregular poly(3-hexylthiophene).
- The self-assembly properties of the polymer are crucial for the emergence of superconductivity.
- This research expands the known electrical properties of conjugated polymers to include superconductivity, opening new avenues for organic electronics.
