An Investigation of the Electrical Performance of Polymer-Based Stretchable TFTs Under Mechanical Strain Using the...

Area of Science:

• Materials Science
• Organic Electronics
• Polymer Science

Background:

• Stretchable semiconductors are crucial for wearable electronics.
• Polymer semiconductors often degrade under tensile strain, limiting device reliability.
• Existing research often focuses on overall performance changes, lacking detailed analysis of degradation origins.

Purpose of the Study:

• To achieve electrical stability in stretchable semiconductors under large mechanical deformation.
• To systematically identify the dominant origin of electrical performance degradation in stretchable thin-film transistors (TFTs).
• To provide quantitative design guidelines for reliable stretchable TFTs.

Main Methods:

• Fabrication of bottom-gate top-contact (BGTC) and bottom-gate bottom-contact (BGBC) TFTs using a rubber-blended DPPT-TT/SEBS CONPHINE structure.
• Stepwise electrical analysis of the gate insulating layer, semiconductor layer, and complete devices under tensile strain.
• Quantitative resistance analysis using the Y-function method to differentiate between channel and contact resistance variations.

Main Results:

• The DPPT-TT/SEBS CONPHINE-based TFTs demonstrated 90% mobility retention at 100% tensile strain.
• Channel resistance variations were identified as the dominant factor in strain-induced performance degradation.
• Contact resistance changes contributed only marginally to the overall performance degradation.

Conclusions:

• Stabilizing channel resistance is critical for achieving high mobility retention in stretchable semiconductors under large deformation.
• The findings offer quantitative insights into designing reliable stretchable TFTs.
• The CONPHINE structure provides a promising pathway for robust, high-performance stretchable electronic devices.