Publication date: 11th March 2026
Halide perovskites have emerged as promising candidates for next-generation optoelectronic devices owing to their superior optical and electronic characteristics. Yet, their practical deployment is severely limited by instability under ambient conditions. In this work, we demonstrate a simple room-temperature in-situ encapsulation approach, where a silica shell derived from (3-aminopropyl)triethoxysilane (APTES) significantly improves both the stability and luminescence of CsPbBr3 nanosheets. Structural analysis (XRD) confirms the preservation of the orthorhombic phase, while FTIR and transient absorption spectroscopy reveal effective surface passivation. The optimized CsPbBr3–SiO2 film, obtained with 1 µL APTES, delivers a ~17-fold increase in photoluminescence intensity and maintains durability against continuous UV irradiation, thermal stress (60 °C), and ambient exposure for over three weeks. Furthermore, integration with gold and silver nanoparticles enables plasmonic modulation of optical and device performance. Notably, the AuNP-coupled CsPbBr3–SiO2 nanosheets exhibit remarkable photodetector response with a responsivity of 1.06 × 102 A/W and a detectivity of 2.71 × 108 Jones. These results highlight an effective strategy for stabilizing halide perovskite nanostructures while tailoring their optoelectronic properties, paving the way toward robust, high-efficiency photodetectors.
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