High‐Performance All‐Inorganic Perovskite Tandem Photodetectors With Bi ₂ TeO ₆ Layer Enabled by Enhanced Dual Pyro‐Phototronic Effect for Triple‐Encryption Imaging Sensing System with Programmable Logic Gate

Abstract

As the focus on information security continues to intensify, encrypted imaging sensing technology becomes increasingly indispensable. However, the widespread application of encrypted imaging sensing technology is hindered by high manufacturing costs and complex system construction. Herein, an all-inorganic perovskite/perovskite tandem self-powered photodetector (PDs) is reported, incorporated with Bi₂TeO₆ layer to enahnce dual pyro-phototronic effect, to realize an innovated encryption imaging sensing system with programmable logic gate. The PDs reach responsivity of 1.46 A W^-1 and detectivity of 3.44 × 10¹³ Jones, the corresponding EQE reaches 342%, which is ≈75.48 times greater than that without pyro-phototronic effect. The outstanding performance resulting from dual pyro-phototronic effect in Cs₂PbI₂Cl₂ perovskite and Bi₂TeO₆/CsSn_0.5Pb_0.5IBr₂ interface, and optimizing band arrangement from the oxidized Bi₂TeO₆ layer. The photovoltaic and pyro-phototronic signal of PDs can still be clearly distinguished under 8 kHz pulsed laser. More importantly, the encryption imaging sensing system achieves simultaneous outputs of triple image information, and their programmable optoelectronic logic gate can execute six distinct logical functions, including "OR", "AND", "XOR", "NAND", "NOR" and "XNOR". This research not only provides a feasible strategy for realizing the outstanding pyro-phototronic effect of all-inorganic perovskite materials, but also presents novel insights for designing encrypted imaging sensing technology.