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Preparation of Silicon Nanowire Field-effect Transistor for Chemical and Biosensing Applications
Published on: April 21, 2016
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Multicolor Spectral-Specific Silicon Nanodetectors based on Molecularly Embedded Nanowires.
Sharon Lefler, Roi Vizel, Ella Yeor
1Andrew and Erna Viterbi Faculty of Electrical Engineering, Technion , Haifa 3200003, Israel.
Nano Letters
|December 5, 2017
Summary
Researchers developed ultrasmall, filter-free photodetectors using organic-silicon nanowire hybrid devices. These novel spectrally gated field effect transistor (SGFET) detectors can distinguish specific red-green-blue-violet wavelengths without color filters, enabling advanced optoelectronics.
Area of Science:
- Nanotechnology
- Optoelectronics
- Materials Science
Background:
- Conventional silicon photodetectors require color filters for wavelength discrimination, increasing device complexity and hindering miniaturization.
- Existing filter-based systems present limitations in fabrication scalability and integration into compact optoelectronic devices.
Purpose of the Study:
- To develop and characterize novel ultrasmall, filter-free photodetectors capable of spectral discrimination.
- To demonstrate the functionality of organic-silicon nanowire hybrid devices for selective wavelength detection.
- To explore the potential of these nanodevices for advanced optoelectronic applications and nonvolatile memory.
Main Methods:
- Fabrication of ultrasmall (∼20 nm by 300 nm) spectrally gated field effect transistor (SGFET) detectors using organic-silicon nanowire hybrid structures.
- Functionalization of SGFETs with specific organic fluorophores for covalent attachment, enabling selective light absorption and electron injection.
- Development of a theoretical model to elucidate the mechanism of spectral detection and device operation.
Main Results:
- Demonstrated filter-free detection of red-green-blue-violet (RGBV) wavelengths with a full width at half-maximum (fwhm) under 100 nm.
- Achieved spectral-specific detection by utilizing distinct organic fluorophores that modify the nanowire FET's conductivity via photoinduced electron injection.
- Showcased suspended SGFETs functioning as nonvolatile memory elements with stable 'on' and 'off' states for several days, and demonstrated single-nanowire multicolor detection.
Conclusions:
- The developed ultrasmall SGFETs offer a filter-free approach to spectral detection, overcoming limitations of traditional photodetectors.
- These nanodevices exhibit potential for novel optoelectronic applications requiring compact, spectrally selective sensing.
- The demonstrated nonvolatile memory and multicolor detection capabilities highlight the versatility of these hybrid nanostructures.
