Combining negative photoconductivity and resistive switching towards in-memory logic operations

Area of Science:

• Materials Science
• Solid State Physics
• Optoelectronics

Background:

• Rudorffite materials based on silver-bismuth-iodide are explored for their electrical and optical properties.
• Understanding the transition from positive photoconductivity (PPC) to negative photoconductivity (NPC) is crucial for novel electronic applications.

Purpose of the Study:

• To investigate the optoelectronic properties of silver-bismuth-iodide rudorffites.
• To explore the potential of these materials in memory devices and logic operations.

Main Methods:

• Synthesis of rudorffite compounds with varying precursor stoichiometry.
• Fabrication of sandwiched devices for photoconductivity and resistive switching measurements.
• Characterization of electrical and optical switching behaviors.

Main Results:

• A transition from positive photoconductivity (PPC) to negative photoconductivity (NPC) was observed with changes in precursor stoichiometry.
• NPC in silver-rich rudorffites is attributed to illumination-induced trap states and carrier recombination.
• Devices exhibited reversible resistive switching (high resistive state/low resistive state) and optoelectronic control of resistive states.
• Demonstration of an OR logic gate operation using NPC-exhibiting rudorffite devices.

Conclusions:

• Rudorffite materials display tunable optoelectronic properties, including negative photoconductivity and electrical/optical memory effects.
• The ability to control resistive states via electrical and optical inputs makes these materials promising for in-memory computing.
• These materials are ideal candidates for developing integrated logic and memory devices.