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Effect of Bending on the Electrical Characteristics of Flexible Organic Single Crystal-based Field-effect Transistors
Published on: November 7, 2016
Field-effect transistors based on thermally treated electron beam-induced carbonaceous patterns
Narendra Kurra1, Venkata Srinu Bhadram, Chandrabhas Narayana
1Chemistry & Physics of Materials Unit and DST Unit on Nanoscience, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur PO, Bangalore 560 064, India.
Electron beam-induced carbonaceous deposition (EBICD) exhibits blue fluorescence due to sp2 carbon clusters. Graphitization above 300 °C enables its use in field-effect transistors with good mobility.
Area of Science:
- Materials Science
- Nanotechnology
- Surface Science
Background:
- Electron beam-induced carbonaceous deposition (EBICD) is formed from residual hydrocarbons in vacuum chambers.
- EBICD is characterized as chemically complex, robust, amorphous, and electrically insulating.
- Understanding EBICD's properties is crucial for advanced material applications.
Purpose of the Study:
- To investigate the chemical and electrical properties of EBICD.
- To explore the influence of temperature on EBICD's structure and conductivity.
- To assess the potential of graphitized EBICD as a semiconductor material.
Main Methods:
- Characterization using Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM).
- Electrical measurements, including temperature-dependent conductivity.
- Fabrication and testing of field-effect transistors (FETs) using graphitized EBICD.
Main Results:
- EBICD displays blue fluorescence under UV radiation, attributed to sp2 carbon clusters within an sp3 matrix.
- Temperature-dependent studies confirmed graphitization of EBICD above 300 °C via functional group decomposition.
- Graphitized EBICD demonstrated p-type channel behavior in FETs with mobilities ranging from 0.2-4 cm²/V s.
Conclusions:
- EBICD possesses unique optical and electrical properties influenced by its carbon structure.
- Thermal treatment induces graphitization, significantly altering EBICD's electrical characteristics.
- Graphitized EBICD shows promise as an active material for p-type field-effect transistors.
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