Organic Donor-Acceptor Complexes as Novel Organic Semiconductors

Area of Science:

• Materials Science
• Organic Electronics
• Solid-State Chemistry

Background:

• Organic donor-acceptor (DA) complexes are crucial for developing advanced organic binary system electronics.
• Existing research has focused on metallicity, emission, and ferroelectricity, with a growing need for high-performance electronic applications.
• Organic semiconductors offer versatility, but challenges remain in optimizing applications and simplifying fabrication.

Purpose of the Study:

• To explore organic DA complexes as a novel class of semiconducting materials.
• To investigate their design, growth, packing, charge transport, and structure-property relationships.
• To demonstrate their potential in organic field-effect transistors (OFETs) and organic photovoltaics (OPVs).

Main Methods:

• Design and synthesis of organic DA complexes.
• Crystallization techniques for highly ordered cocrystals.
• Fabrication and investigation of devices based on binary crystals, employing techniques from self-assembly, crystallography, condensed-matter physics, and theoretical chemistry.

Main Results:

• DA complex materials exhibit unique molecular packing and structure-property relationships, offering advantages over unimolecular materials.
• Self-assembled DA cocrystals facilitate efficient charge transport and reduce impurities.
• Tunable band structures allow systematic control of transistor operation modes (p- or n-type) by component selection; molecular doping can switch charge transport nature.

Conclusions:

• Organic DA complexes represent a promising new strategy for developing high-performance organic semiconductors.
• Cocrystal formation through DA complexation offers practical advantages in device fabrication and performance.
• Further design strategies, including component selection and energy level modulation, can enhance device characteristics.