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Conducting polymer/silicon heterojunction diode for gamma radiation detection
J M G Laranjeira1, H J Khoury, W M de Azevedo
1Departmento de Energia Nuclear, Universidade Federal de Pernambuco, Recife, Brazil.
Radiation Protection Dosimetry
|October 18, 2002
Summary
New silicon/polyaniline heterojunction devices offer sensitive gamma-radiation detection. These diodes show excellent electrical properties and a linear response for dosimetry and spectrometry applications.
Area of Science:
- Materials Science
- Semiconductor Devices
- Radiation Detection
Background:
- Traditional radiation detectors face limitations.
- Heterojunction devices offer potential for improved performance.
- Polyaniline presents unique electronic properties.
Purpose of the Study:
- To develop and characterize novel silicon/polyaniline heterojunction devices for gamma-radiation detection.
- To evaluate the electrical and radiation sensing capabilities of these devices.
Main Methods:
- Fabrication of silicon/polyaniline heterostructures using spin-coating technique.
- Characterization of thin film properties and device electrical performance.
- Testing device sensitivity and response to gamma radiation across a wide dose range.
Main Results:
- Achieved high-quality silicon/polyaniline heterostructures with 40 nm polyaniline films.
- Demonstrated excellent electrical characteristics: rectification ratio of 60,000, low nA reverse currents, ideality factor ~2.
- Observed high sensitivity to gamma radiation (0-7000 Gy) with a linear response in both forward and reverse bias.
Conclusions:
- Silicon/polyaniline heterojunctions exhibit promising potential for gamma-radiation sensor applications.
- The devices' excellent electrical properties and linear dose response are suitable for gamma ray spectrometry and dosimetry.
- These findings suggest a viable alternative for low and high dose radiation detection.