Wearable Gallium Oxide Solar-Blind Photodetectors on Muscovite Mica Having Ultrahigh Photoresponsivity and Detectivity with Added High-Temperature Functionalities

Bhera Ram Tak*, Vinay Gupta, Ashok Kumar Kapoor, Ying-hao Chu, Rajendra Singh

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Wearable gallium oxide solar-blind photodetector fabricated on muscovite mica is reported for room temperature as well as high-temperature operations. The ultrahigh photoresponsivity of 9.7 A/W is obtained for 5 V applied bias at room temperature under 75 mu W/cm(2) weak illumination of 270 nm wavelength. The detector enables very low noise equivalent power (NEP) of 9 x 10(-13) W/Hz(1/2) and ultrahigh detectivity of 2 x 10(12) jones which shows the magnificent detection sensitivity. Further, bending tests are performed for robust utilization of flexible detectors up to 500 bending cycles with each bending radius of 5 mm. After 500 bending cycles, the device shows a slight photocurrent decrease. The bending performances exhibit excellent potential for wearable applications. Moreover, photocurrent and dark current characteristics above room temperature demonstrate the outstanding functionalities until 523 K temperature, which is remarkable for flexible photodetectors. The obtained results show the potential of gallium oxide solar-blind photodetectors at room-temperature and high-temperature environments, paving the way for futuristic smart and flexible sensors.

Original languageEnglish
Pages (from-to)2463-2470
Number of pages15
JournalACS Applied Electronic Materials
Issue number11
StatePublished - Nov 2019


  • solar-blind photodetectors
  • gallium oxide
  • mica
  • flexible photodetector
  • photoresponse
  • detectivity
  • NM

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