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Pyromellitic Diimide-Ethynylene-Based Homopolymer Film as an N-Channel Organic Field-Effect Transistor Semiconductor.
Srinivas Kola, Joo Hyun Kim1, Robert Ireland
1Department of Polymer Engineering, Pukyong National University, Yongdang-Dong, Nam-Gu, Busan 608-739, Korea.
ACS Macro Letters
|May 24, 2022
Summary
We synthesized simple, solution-processable pyromellitic diimide (PyDI)-acetylene polymers for organic electronics. One polymer demonstrated efficient electron transport, paving the way for new n-channel semiconducting materials.
Area of Science:
- Materials Science
- Organic Electronics
- Polymer Chemistry
Background:
- Conjugated polymers are crucial for organic electronic devices.
- Developing efficient n-channel semiconducting polymers remains a challenge.
- Pyromellitic diimide (PyDI)-based materials offer potential for electron transport.
Purpose of the Study:
- To synthesize and characterize novel pyromellitic diimide (PyDI)-acetylene-based conjugated homopolymers.
- To evaluate their potential for n-channel organic field-effect transistor (OFET) applications.
- To explore their thermoelectric properties.
Main Methods:
- Stille coupling reaction to synthesize PyDI-acetylene polymers.
- Cyclic voltammetry to assess electron affinity.
- Thin-film fabrication and characterization using OFET devices.
- X-ray diffraction (XRD) and atomic force microscopy (AFM) for structural analysis.
- Seebeck coefficient measurements for thermoelectric evaluation.
Main Results:
- Two solution-processable PyDI-acetylene homopolymers were successfully synthesized.
- The polymer with an octyl side chain exhibited enhanced intermolecular interactions in thin films.
- This octyl polymer demonstrated electron transport with mobility of 2 × 10⁻⁴ cm²/V·s and an on/off ratio of 10³ in OFETs.
- The octyl polymer showed a negative Seebeck coefficient (-40 μV/K), confirming n-channel behavior.
- A polymer with a 4-trifluoromethylphenethyl side chain did not yield measurable electron mobility.
Conclusions:
- The synthesized octyl-substituted PyDI-acetylene polymer is the simplest reported n-channel polymer to date.
- This work establishes a new synthetic route for creating n-channel semiconducting polymer films.
- The findings open avenues for developing advanced organic electronic and thermoelectric devices.
