Multi-Mode Operation and Reconfigurable Rectification in Schottky-Barrier Vertical Organic Transistors.

Area of Science:

• Organic electronics
• Semiconductor device physics
• Materials science

Background:

• Schottky-barrier vertical organic field-effect transistors (SB-VOFETs) offer high current densities and vertical integration.
• Existing characterization methods inadequately capture the full operational range and hybrid nature of SB-VOFETs.

Purpose of the Study:

• To comprehensively characterize SB-VOFETs across all operational regimes.
• To investigate the overlooked hybrid transistor-diode behavior.
• To propose a model explaining the observed electrical characteristics.

Main Methods:

• Comprehensive bias characterization of SB-VOFETs with nanoporous silver source electrodes.
• Development and validation of a hybrid dual-path current model.
• Technology computer-aided design (TCAD) simulations for model validation.

Main Results:

• SB-VOFETs function as gate-tunable Schottky diodes over a wide voltage range, beyond standard transistor operation.
• A hybrid dual-path model, including gate-insensitive and gate-tunable currents, accurately describes device behavior.
• Demonstrated a single-device reconfigurable rectifier capable of switching between rectification and quasi-ohmic conduction.

Conclusions:

• SB-VOFETs possess inherent multifunctionality beyond conventional transistor operation.
• The proposed hybrid model enhances understanding of SB-VOFETs' complex electrical behavior.
• Gate-programmability unlocks potential for novel applications in reconfigurable organic electronic circuits.