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Non-Linear Self-Heating in Organic Transistors Reaching High Power Densities
Markus P Klinger1, Axel Fischer2, Hans Kleemann2,3
1Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP), Technische Universität Dresden, Nöthnitzer Str. 61, 01187, Dresden, Germany. markus.klinger@iapp.de.
Scientific Reports
|June 30, 2018
Summary
Organic transistors exhibit S-shaped negative differential resistance due to electrothermal feedback. This study analyzes organic permeable-base transistors (OPBTs) to understand temperature-dependent conductivity for material discovery.
Area of Science:
- Organic electronics
- Semiconductor device physics
Background:
- Organic thin-film transistor (OTFT) performance is enhanced by novel materials and device engineering, focusing on charge carrier mobility, miniaturization, and contact resistance.
- New designs like vertical devices reduce channel length while maintaining moderate fabrication complexity.
Purpose of the Study:
- To investigate the occurrence and impact of electrothermal feedback in organic transistors.
- To analyze the resulting S-shaped negative differential resistance in device output characteristics.
- To explore the potential of organic permeable-base transistors (OPBTs) for revealing non-linear electrothermal effects.
Main Methods:
- Utilizing an organic permeable-base transistor (OPBT) with high current densities.
- Observing and analyzing the non-linear electrothermal feedback.
- Deriving an analytical model for temperature-dependent current-voltage behavior.
Main Results:
- A strong and reproducible electrothermal feedback was observed in OPBTs.
- The feedback leads to output characteristics featuring regions of S-shaped negative differential resistance.
- An analytical description of temperature-dependent current-voltage behavior was successfully derived.
Conclusions:
- Electrothermal feedback is a significant factor influencing organic transistor performance, causing unique electrical characteristics.
- OPBTs serve as a valuable platform for studying these electrothermal effects.
- The derived analytical method can accelerate the investigation of materials with temperature-activated conductivity.
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