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Picene and PTCDI based solution processable ambipolar OFETs.

Balu Balambiga¹, Ramachandran Dheepika¹, Paneerselvam Devibala¹

¹Department of Chemistry, Central University of Tamil Nadu, Thiruvarur, 610 005, India.

Scientific Reports

|December 17, 2020

Summary

This study developed efficient organic field-effect transistors using picene (donor) and N,N'-di(dodecyl)-perylene-3,4,9,10-tetracarboxylic diimide (acceptor) blends. Optimized ratios significantly enhanced charge carrier mobility and performance for electronic applications.

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Area of Science:

Materials Science
Organic Electronics
Semiconductor Physics

Background:

Organic field-effect transistors (OFETs) are crucial for flexible electronics.
Developing high-performance, solution-processable organic semiconductors is essential for cost-effective fabrication.
Tuning molecular interactions in donor-acceptor blends is key to optimizing charge transport properties.

Purpose of the Study:

To fabricate efficient solution-processed bottom gate top contact organic field-effect transistors (OFETs).
To investigate the performance of picene (donor) and N,N -di(dodecyl)-perylene-3,4,9,10-tetracarboxylic diimide (acceptor) blends.
To understand the relationship between molecular interactions, blend ratios, and device performance.

Main Methods:

Fabrication of OFETs using solution-processed picene (D) and N,N -di(dodecyl)-perylene-3,4,9,10-tetracarboxylic diimide (A) as the active layer.
Characterization of charge carrier mobility (holes and electrons) and on/off current ratios.
Cyclic voltammetry, thermal analysis, scanning electron microscopy (SEM), grazing-incidence X-ray diffraction (GIXRD), and density functional theory (DFT) calculations.

Main Results:

A 1:1 D/A blend achieved balanced hole (0.12 cm²/Vs) and electron (0.10 cm²/Vs) mobility with an on/off ratio of 10⁴.
Optimized blend ratios (3:1 D/A and 1:3 D/A) significantly improved charge carrier mobility up to 0.44 cm²/Vs (hole) and 0.25 cm²/Vs (electron).
Enhanced performance is attributed to reduced trap densities, optimized molecular orbital alignment, and improved molecular packing and crystallinity.

Conclusions:

Donor-acceptor blends offer superior performance compared to pristine molecules.
The D/A pair exhibits high thermal stability and excellent molecular packing, confirmed by various characterization techniques.
This picene and PDI-based D/A system shows significant potential for applications in non-volatile memory devices, inverters, and logic circuits.