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Self-Aligned Bilayers for Flexible Free-Standing Organic Field-Effect Transistors
Hanna Zajaczkowska1, Lothar Veith2, Witold Waliszewski1
1Department of Molecular Physics, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland.
ACS Applied Materials & Interfaces
|December 6, 2021
Summary
Flexible field-effect transistors using TIPS-pentacene and polystyrene bilayers achieve high performance and stability. Optimized phase separation enables applications in strain sensing with stable current-strain relationships.
Area of Science:
- Materials Science
- Organic Electronics
- Nanotechnology
Background:
- Developing stable and high-performance flexible electronics is crucial for advanced applications.
- Organic field-effect transistors (OFETs) offer potential for low-cost, flexible devices.
- Controlling morphology in organic semiconductor blends is key to device performance.
Purpose of the Study:
- To fabricate free-standing and flexible field-effect transistors using TIPS-pentacene/polystyrene bilayers.
- To investigate the effect of polystyrene molecular weight on phase separation and morphology.
- To evaluate the performance, stability, and strain-sensing capabilities of the flexible OFETs.
Main Methods:
- Fabrication of TIPS-pentacene/polystyrene blend films.
- Induction of phase separation via solvent vapor annealing.
- Characterization of blend morphology and TIPS-pentacene crystallinity.
- Electrical performance testing of flexible field-effect transistors under various conditions.
Main Results:
- Achieved well-controlled phase separation and distinct bilayer morphology.
- Demonstrated high charge carrier mobilities comparable to rigid devices.
- Exhibited pronounced environmental and bias stress stability.
- Observed stable performance up to 1.8% strain, with strain-sensing capabilities beyond this point.
Conclusions:
- Optimized phase separation in TIPS-pentacene/polystyrene bilayers yields high-performance flexible OFETs.
- The distinct bilayer morphology contributes to enhanced device stability.
- These flexible transistors are suitable for electronic applications and show promise for strain sensing.
