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Schottky junction devices by using bio-molecule DNA template-based one dimensional CdS-nanostructures
Sachindra Nath Sarangi1, Bhaskar Chandra Behera2, Naba Kishore Sahoo3
1Institute of Physics, P.O. Sainik School, Bhubaneswar, 751 005, India.
Biosensors & Bioelectronics
|June 17, 2021
Summary
DNA nanotechnology enables novel metal/semiconductor junctions. DNA-assembled nanowires (NWs) show enhanced electrical properties compared to nanoparticles (NPs), paving the way for advanced biosensors.
Area of Science:
- Nanotechnology
- Materials Science
- Biomolecular Engineering
Background:
- DNA nanotechnology offers a platform for creating precise nanostructures.
- Metal/inorganic semiconductor junctions are crucial for electronic devices.
- Developing DNA-templated nanowires (NWs) with enhanced electrical properties is an emerging research area.
Purpose of the Study:
- To investigate and compare the electrical properties of DNA-templated CdS/Au nanowire (NW) devices with non-templated CdS/Au nanoparticle (NP) devices.
- To analyze the current-voltage (I-V) and capacitance-voltage (C-V) characteristics of these devices.
- To explore the potential of DNA-assembled nanostructures for biosensing applications.
Main Methods:
- Fabrication of one-dimensional (1D) CdS/Au nanowires (NWs) using DNA templates on Indium Tin Oxide (ITO) glass substrates.
- Fabrication of CdS/Au nanoparticles (NPs) without templates on ITO glass.
- Electrical characterization using current-voltage (I-V) and capacitance-voltage (C-V) measurements.
Main Results:
- The DNA-templated NWs-CdS/Au device exhibited significantly enhanced current flow and a lower threshold voltage (~55 mV) compared to NPs (~190 mV) and bulk CdS/Au (~680 mV).
- Non-linear/asymmetric I-V characteristics confirmed Schottky behavior, with a large ideality factor (~24) in NWs-CdS/Au potentially due to the DNA-templated organic process.
- C-V measurements revealed a frequency-dependent hump-like feature in NWs-CdS/Au, attributed to surface/interface traps.
Conclusions:
- DNA-assembled nanowires demonstrate superior electrical properties for CdS/Au Schottky junctions compared to nanoparticle counterparts.
- The observed electrical characteristics, including the ideality factor and frequency dispersion, are influenced by the DNA templating process and interface trap density.
- These findings suggest that DNA-assembled nanostructures hold promise for developing sophisticated and highly specific biosensors for medical applications.
