Hexathiapentacene: structure, molecular packing, and thin-film transistors

Area of Science:

• Organic electronics
• Materials science
• Solid-state chemistry

Background:

• Hexathiapentacene (HTP) is an organic semiconductor with potential applications in electronic devices.
• Understanding its molecular structure and packing is crucial for optimizing its performance.

Purpose of the Study:

• To investigate the electrical characteristics of HTP.
• To elucidate the unusual chemical structure and molecular packing of HTP.
• To explore the application of HTP in organic transistors.

Main Methods:

• Electrical characterization of HTP field-effect transistors.
• Crystallographic analysis to determine molecular structure and packing.
• Theoretical analysis of bonding characteristics.

Main Results:

• Achieved field-effect mobilities as high as 0.04 cm² V⁻¹ s⁻¹.
• Reported current on/off ratios exceeding 10⁵.
• Identified unusually long S-S bonds, suggesting a unique resonance structure.

Conclusions:

• HTP demonstrates promising electrical properties for organic electronics.
• The unique molecular structure and packing of HTP are responsible for its observed electronic behavior.
• This study provides the first determination of HTP's molecular structure/packing and its transistor application.