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DNA interlayers enhance charge injection in organic field-effect transistors
Yuan Zhang1, Peter Zalar, Chunki Kim
1Center for Polymers and Organic Solids, Departments of Chemistry and Biochemistry and Materials, University of California, Santa Barbara, Santa Barbara, CA 93106, USA.
Advanced Materials (Deerfield Beach, Fla.)
|June 22, 2012
Summary
Researchers improved organic field-effect transistors by adding DNA interlayers. This significantly reduced contact resistance and enhanced electron and hole mobilities in ambipolar transistors.
Area of Science:
- Materials Science
- Organic Electronics
- Semiconductor Physics
Background:
- Organic field-effect transistors (OFETs) are crucial for flexible electronics.
- High contact resistance and low charge carrier mobility limit OFET performance.
- Diketopyrrolopyrrole-based semiconductors offer ambipolar charge transport properties.
Purpose of the Study:
- To investigate the effect of DNA interlayers on the electrical properties of organic field-effect transistors.
- To reduce contact resistance and improve charge carrier mobility in PC(70)BM transistors.
- To analyze the impact on threshold voltage and ambipolar transport characteristics.
Main Methods:
- Fabrication of gold (Au) contacts with inserted DNA interlayers beneath the active layer.
- Electrical characterization of the modified field-effect transistors.
- Measurement of contact resistance, electron and hole mobilities, and threshold voltage.
Main Results:
- Contact resistance was reduced by approximately 30 times at a gate bias of 20 V.
- Electron and hole mobilities of ambipolar diketopyrrolopyrrole transistors increased by one order of magnitude.
- Threshold voltage was reduced from 12 V to 6.5 V.
Conclusions:
- Insertion of DNA interlayers is an effective strategy to significantly improve the performance of organic field-effect transistors.
- DNA interlayers facilitate enhanced charge injection and transport, leading to superior device characteristics.
- This approach offers a promising route for developing high-performance, low-voltage organic electronic devices.
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