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Atomically Thin Two-Dimensional π-Conjugated Kagomé Polymers with Dirac Cone-Driven Charge Transport
Dominik Dettmann1,2, Alessandro Pecchia3, Andrea Notargiacomo4
1Centre Énergie, Matériaux et Télécommunications, Institut National de la Recherche Scientifique Department, 1650 Boulevard Lionel-Boulet, J3X 1P7Varennes, Québec, Canada.
ACS Nano
|July 17, 2026
Summary
Atomically thin two-dimensional conjugated polymers (2DCPs) with Kagomé lattice symmetry were integrated into field-effect transistors (FETs). These novel organic electronic devices exhibit graphene-like conductivity modulation, paving the way for advanced nanoelectronics.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Organic Electronics
Background:
- Two-dimensional nanomaterials are crucial for next-generation technologies like quantum computing and sensing.
- On-surface synthesized two-dimensional conjugated polymers (2DCPs) with Kagomé lattice symmetry offer unique electronic properties, including flat bands and Dirac cones.
- These 2DCPs can form large, ordered domains, making them suitable for device integration.
Purpose of the Study:
- To integrate atomically thin, surface-confined 2DCPs with Kagomé lattice symmetry into field-effect transistors (FETs).
- To investigate the electronic transport properties of these novel 2DCP-based FETs.
- To explore the potential of these materials for functional electronic devices and high-performance sensing.
Main Methods:
- Fabrication of field-effect transistors (FETs) using surface-confined 2DCPs.
- Characterization of electrical transport behavior using platinum (Pt) contacts.
- Validation of experimental findings through ab initio density functional theory (DFT) calculations.
- Numerical simulations using the drift-diffusion equation.
Main Results:
- The fabricated FETs demonstrated ohmic transport characteristics with Pt contacts.
- Ambipolar, graphene-like field-induced conductivity modulation was observed.
- The observed transport behavior was directly correlated with the Dirac cone in the electronic band structure of the 2DCPs.
- DFT calculations and drift-diffusion simulations confirmed the experimental transport findings.
Conclusions:
- Two-dimensional conjugated polymers with Kagomé lattice symmetry can be successfully integrated into functional field-effect transistors.
- These materials exhibit tunable electronic properties, including Dirac cones, enabling graphene-like conductivity modulation.
- The results underscore the significant potential of Kagomé lattice 2DCPs for future applications in nanoelectronics and advanced sensing technologies.
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