A Self-Driven Bidirectional Photocurrent Photodetector for Optically Controlled Logic Gates Utilizes a GaN-Nanowall Network

• Published in: ACS applied optical materials Vol. 2; no. 7; pp. 1353 - 1359
• Main Authors: Vashishtha, Pargam, Jain, Shubhendra Kumar, Prajapat, Pukhraj, Verma, Ajay Kumar, Aggarwal, Neha, Murdoch, Billy J., Walia, Sumeet, Gupta, Govind
• Format: Journal Article
• Language: English
• Published: American Chemical Society 26.07.2024
• Subjects: Ultraviolet; Optical logic-device; GaN; Photodetector; Bidirectional photocurrent
• ISSN: 2771-9855; 2771-9855
• DOI: 10.1021/acsaom.4c00166

This Communication has reported a GaN-nanowall-network-based bidirectional photocurrent self-driven photodetector. The device leverages the unique properties of gallium nitride nanowall networks to modulate surface potentials, enabling bidirectional photocurrent generation and a self-driven nature. The detector enables a negative photocurrent under 266 nm illumination, while a positive photocurrent is obtained with a 355 nm source at 0 V applied bias. Peak responsivities of −2.5 and 1.7 A W–1 have been attained for the illumination wavelengths of 266 and 355 nm, respectively, under self-driven mode. Distinct logic states were realized by selectively illuminating the device with different wavelengths. The device operates as self-driven logic gates with output states defined relative to a fiducial zero point. The photocurrent direction and magnitude are also adjustable by varying the optical power intensity. Our findings demonstrate the potential of GaN-nanowall networks for realizing versatile, futuristic multifunction ultraviolet self-driven photonic devices.