Ferroelectric Optoelectronic Memory Based on p-GaN/ZnGa₂O₄/BaTiO₃/n-ITO Heterojunction with Integrated Sensing and...

Area of Science:

• Materials Science
• Optoelectronics
• Semiconductor Devices

Background:

• Ferroelectric optoelectronic memories offer integrated sensing, computing, and storage, crucial for AI and IoT.
• Wide-bandgap semiconductors like ZnGa2O4 and GaN possess excellent optoelectronic properties.
• BaTiO3 thin films exhibit tunable polarization for memory applications.

Purpose of the Study:

• To demonstrate a nonvolatile p-GaN/ZnGa2O4/BaTiO3/n-ITO ferroelectric optoelectronic memory.
• To investigate the device's self-powered ultraviolet photodetection performance.
• To explore the memory and logic functionalities of the ferroelectric optoelectronic device.

Main Methods:

• Fabrication of a p-GaN/ZnGa2O4/BaTiO3/n-ITO heterostructure.
• Characterization of ultraviolet photodetection performance under zero bias.
• Modulation of BaTiO3 polarization to achieve memory functionality.
• Demonstration of a 5x5 memory array and logic gate operations.

Main Results:

• Superior self-powered ultraviolet photodetection with peak responsivity of 7 mA/W.
• Fast response speeds (rise time: 6 ms, fall time: 12 ms).
• Stable photocurrent for over 5 months in the up-polarized state, confirming long-term storage.
• Successful demonstration of a 5x5 memory array for imaging, storage, and readout.
• Functionality as "AND" and "OR" logic gates based on polarization and input signals.

Conclusions:

• The developed ferroelectric optoelectronic memory shows promise for integrated sensing, memory, and computing.
• The device's performance is suitable for advanced AI and IoT applications.
• This work opens new avenues for ferroelectric-based optoelectronic devices.