Novel Ultraviolet and Ionizing Radiation Detectors Made From TiO Wide-Bandgap Semiconductor

Pankaj Chetry, Elizabeth George, Pradeep Sarin, Kantimay Das Gupta, K. Suresh, J. Navas, C. David, R. Govindaraj, 

IITB-Monash Research Academy, Indian Institute of Technology Bombay, Powai, Mumbai, India
Department of Physics, Indian Institute of Technology Bombay, Powai, Mumbai, India
Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu, India

IEEE Sensors Journal ( Volume: 23, Issue: 1, 01 January 2023)
11/29/22
https://doi.org/10.1109/JSEN.2022.3224809

We describe the fabrication and characterization of a novel ultraviolet (UV) and ionizing radiation detector using a polycrystalline TiO2 wide-bandgap semiconductor as the active material. The detector geometry we have developed and tested is a polycrystalline TiO2 thin film with planar electrode contacts for signal pickup. Several prototypes were fabricated using two single-step techniques. We present the dc characterization of these devices and the signal response to the UV light and low-energy proton beam irradiation. The detector prototypes show excellent dc characteristics and fast ac signal response at bias voltage as low as 50 V.

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