2-Positional pyrene end-capped oligothiophenes for high performance organic field effect transistors

Area of Science:

• Organic electronics
• Materials science
• Semiconductor physics

Background:

• Oligothiophenes are key materials for organic field-effect transistors (OFETs).
• Pyrene end-capping can influence the electronic and optical properties of oligothiophenes.
• Tuning molecular structure is crucial for optimizing OFET performance.

Purpose of the Study:

• Synthesize novel pyrene end-capped oligothiophene co-oligomers.
• Investigate their potential for application in organic field-effect transistors (OFETs).
• Evaluate their charge transport and photoluminescence properties.

Main Methods:

• Chemical synthesis of three new 2-positional pyrene end-capped oligothiophene co-oligomers, denoted BPynT (n = 1, 2, 3).
• Fabrication and characterization of single crystal organic field-effect transistors (OFETs).
• Measurement of charge carrier mobility and photoluminescence efficiency.

Main Results:

• The BPy2T co-oligomer exhibited the highest hole mobility, reaching 3.3 cm(2) V(-1) s(-1) in a single crystal OFET.
• BPy2T demonstrated a significant photoluminescence efficiency of 32% in the crystalline state.
• Green light emission was observed from the OFET device utilizing a BPy2T single crystal.

Conclusions:

• The synthesized pyrene end-capped oligothiophenes, particularly BPy2T, are promising materials for high-performance OFETs.
• BPy2T's high mobility and efficient photoluminescence suggest potential for both electronic and optoelectronic applications.
• Further research into these co-oligomers could lead to advancements in organic electronic devices.