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Monolayer transistor using a highly ordered conjugated polymer as the channel
J Campbell Scott1, J D Jeyaprakash Samuel, Jennifer H Hou
1IBM Research Division, IBM Almaden Research Center, San Jose, California 95120, USA. jcscott@almaden.ibm.com
Nano Letters
|December 14, 2006
Summary
Field-effect transistors were created using polydiacetylene (PDA) derivatives. High alignment of PDA polymer chains is crucial for transistor functionality, enabling current modulation via gating voltage.
Area of Science:
- Materials Science
- Organic Electronics
- Polymer Chemistry
Background:
- Polydiacetylene (PDA) derivatives are known for their unique optical and electronic properties.
- Field-effect transistors (FETs) are fundamental electronic components with applications in various electronic devices.
- Exploring novel organic materials for FET applications is essential for advancing flexible and low-cost electronics.
Purpose of the Study:
- To fabricate and characterize field-effect transistor (FET) structures utilizing polydiacetylene (PDA) derivatives.
- To investigate the relationship between the molecular ordering of PDA materials and their performance in FET devices.
- To identify the key material properties required for successful transistor action in PDA-based systems.
Main Methods:
- Fabrication of FET structures with monolayer channels of UV-polymerized pentacosa-10,12-diynoic ethanolamide.
- Electrical characterization of the fabricated FETs, including measurement of source-drain current modulation under applied gating voltage.
- Analysis of the two-dimensional crystal morphology of the PDA derivatives using advanced imaging techniques.
- Comparative study of PDA derivatives with varying degrees of chain alignment to correlate structure with electronic properties.
Main Results:
- Successful fabrication of field-effect transistor structures based on polydiacetylene derivatives.
- Demonstration of source-drain current modulation in response to an applied gating voltage for UV-polymerized pentacosa-10,12-diynoic ethanolamide.
- Identification of a strong correlation between high alignment and order in PDA polymer chains and the observed transistor action.
- Observation that closely related PDA derivatives lacking high chain order do not exhibit significant gating effects.
Conclusions:
- The study confirms that polydiacetylene (PDA) derivatives can function as active channel materials in field-effect transistors.
- A high degree of alignment and order in the polymer chains is a critical requirement for achieving transistor behavior in PDA-based FETs.
- These findings provide valuable insights into the structure-property relationships governing the electronic performance of PDA materials, guiding the design of future organic electronic devices.
