Azurin-TiO₂ hybrid nanostructure field effect transistor for efficient ultraviolet detection

Area of Science:

• Materials Science
• Nanotechnology
• Optoelectronics

Background:

• Hybrid semiconductor nanostructures offer unique properties for nano-optoelectronics and sensors.
• Azurin-TiO2 hybrid nanostructures exhibit synergistic effects between the metal oxide and azurin, enhancing device performance.

Purpose of the Study:

• To fabricate and characterize a back-gated transistor using Azurin-TiO2 hybrid nanostructures.
• To evaluate the performance of the Azurin-TiO2 nanostructure as a photodetector.
• To explore the potential of these hybrid nanostructures for biocompatible optoelectronic devices.

Main Methods:

• Fabrication of a back-gated transistor with a 300 nm Azurin-TiO2 channel.
• Surface potential mapping using Kelvin probe force microscopy for band gap estimation.
• Electrical and photoresponse characterization of the fabricated device.

Main Results:

• The transistor demonstrated a majority carrier mobility of 2.26 cm2 V-1 s-1, Schottky barrier height of 133.56 meV, and low off-current.
• The photodetector achieved a high spectral response (8.7 × 10^5 A W^-1) and detectivity (6.4 × 10^14 Jones) at 260 nm.
• High gain (2.6 × 10^6), significant rejection ratio (56.2), and fast response times (rise: 0.52 s, fall: 0.65 s) were observed.

Conclusions:

• Azurin-TiO2 hybrid nanostructures exhibit excellent performance characteristics for photodetector applications.
• The synergetic effect in these hybrid nanostructures is crucial for their enhanced optoelectronic properties.
• These findings suggest the suitability of Azurin-TiO2 hybrid nanostructures for high-performance, biocompatible optoelectronic devices.