High-Performance All-Inorganic Perovskite Tandem Photodetectors With Bi₂TeO₆ Layer Enabled by Enhanced Dual...

Area of Science:

• Materials Science
• Optoelectronics
• Information Security

Background:

• Information security demands advanced encrypted imaging sensing, but high costs and complex systems limit current technologies.
• Perovskite materials offer potential for self-powered photodetectors (PDs) but require enhanced pyro-phototronic effects for sophisticated applications.

Purpose of the Study:

• To develop an innovative encrypted imaging sensing system with programmable logic gates using an all-inorganic perovskite/perovskite tandem self-powered photodetector.
• To enhance the dual pyro-phototronic effect by incorporating a Bi2TeO6 layer for improved performance and functionality.

Main Methods:

• Fabrication of an all-inorganic perovskite/perovskite tandem self-powered photodetector (PDs) integrated with a Bi2TeO6 layer.
• Characterization of the photodetector's responsivity, detectivity, and the pyro-phototronic effect under pulsed laser conditions.
• Implementation and testing of a programmable optoelectronic logic gate system for encrypted imaging.

Main Results:

• The developed PDs exhibit high responsivity (1.46 A W⁻¹) and detectivity (3.44 × 10¹³ Jones), with an EQE 75.48 times greater than devices without the pyro-phototronic effect.
• The dual pyro-phototronic effect, enhanced by the Bi2TeO6 layer and optimized band arrangement, enables clear distinction of photovoltaic and pyro-phototronic signals even at 8 kHz.
• The encryption imaging system successfully achieved simultaneous triple image information output and executed six distinct logical functions (OR, AND, XOR, NAND, NOR, XNOR).

Conclusions:

• The research presents a feasible strategy for achieving a significant pyro-phototronic effect in all-inorganic perovskite materials.
• The developed system offers novel insights for designing advanced encrypted imaging sensing technology with integrated logic functions.
• This work addresses limitations in current encrypted imaging by providing a cost-effective and less complex solution with enhanced performance.