High-performance β-Ga₂O₃ thickness dependent solar blind photodetector

Area of Science:

• Materials Science
• Semiconductor Physics
• Optoelectronics

Background:

• Gallium oxide (Ga2O3) is a promising wide bandgap semiconductor with significant potential.
• Research in Ga2O3 focuses on improving material quality and device performance for various applications.

Purpose of the Study:

• To fabricate high-quality beta-gallium oxide (β-Ga2O3) films using pulsed laser deposition.
• To investigate the effect of film thickness on crystal properties.
• To develop and characterize ultraviolet (UV) photodetectors based on these β-Ga2O3 films.

Main Methods:

• Pulsed laser deposition (PLD) was employed to grow β-Ga2O3 films of varying thicknesses.
• Crystal properties, including grain size and surface roughness, were analyzed as a function of thickness.
• UV photodetectors with interdigital electrodes were fabricated on the prepared β-Ga2O3 films.

Main Results:

• β-Ga2O3 films with increasing grain size and surface roughness were achieved with greater thickness.
• Fabricated UV photodetectors exhibited an ultralow dark current of 100 fA.
• The devices demonstrated a high photocurrent on/off ratio of 10^8 and a fast photoresponse time of 4 ms.

Conclusions:

• Pulsed laser deposition is an effective method for producing high-quality β-Ga2O3 films for optoelectronic applications.
• The developed β-Ga2O3 UV photodetectors show excellent performance characteristics, surpassing previous reports.
• This research highlights the significant potential of Ga2O3 for advanced UV detection technologies.