Benzo[b]selenophene/thieno[3,2-b]indole-Based N,S,Se-Heteroacenes for Hole-Transporting Layers

Area of Science:

• Organic Chemistry
• Materials Science
• Condensed Matter Physics

Background:

• Development of novel organic semiconductors is crucial for advancing organic electronics.
• Heteroacenes offer tunable electronic properties through structural modification.

Purpose of the Study:

• To synthesize and characterize new N,S,Se-heteroacenes.
• To evaluate their potential as hole-transporting materials for organic electronic applications.

Main Methods:

• Fiesselmann thiophene synthesis.
• Fischer indole synthesis.
• Optical band gap and HOMO energy level measurements.
• Carrier mobility measurements using CELIV technique.

Main Results:

• Successful synthesis of two series of N,S,Se-heteroacenes.
• Large optical band gaps (2.82–3.23 eV) observed.
• Highest occupied molecular orbital (HOMO) energy levels ranged from -5.2 to -5.6 eV.
• Hole mobility in thin films measured between 10^-5 and 10^-4 cm^2·V^-1·s^-1.

Conclusions:

• The synthesized heteroacenes possess favorable electronic and optical properties.
• Selenated heteroacenes exhibit narrower band gaps and lower HOMO levels.
• These compounds represent a promising platform for developing efficient hole-transporting materials in organic electronics.