Ultrastable Perovskite through a SiO₂ and PbSO₄ Double Protection Strategy

Abstract

Perovskites have gained significant attention due to their excellent optoelectronic properties. However, the poor stability of perovskites hinders their practical applications. To address this issue, we propose a facile approach to synthesize stable CsPbBr3 nanomaterials by embedding them into a SiO2 matrix followed by an in situ PbSO4 shell coating on their surfaces. After the encapsulation, the CsPbBr3@PbSO4/SiO2 powder exhibits high photoluminescence quantum yield (PLQY, ∼85%) due to reduced defects. Most importantly, the CsPbBr3@PbSO4/SiO2 powder shows robust stability under many harsh conditions, such as maintaining its PL in water (for 1 year), concentrated hydrochloric acid (HCl) aqueous solution and hydrobromic acid (HBr) aqueous solution (for 25 days), boiling water (for 24 h), high temperature (500 °C for 24 h), and light irradiation (365 nm for 3 months). This work not only provides a strategy for the facile preparation of ultrastable and efficient perovskites but also shows great potential for practical applications such as solid lighting and backlight displays.

Efficient and Stable Perovskite White Light‐Emitting Diodes for Backlit Display

“…[22] Regrettably, naked MHPs suffers from long-term instable issue, which cannot pass harsh stability tests, especially the commercial standards of 85°C/85% RH stability and blue-lightirradiation stability. Among several reported strategies, [23][24][25][26][27][28][29][30][31] embedding MHPs inside robust inorganic glass is believed to be feasible for the effective isolation of MHPs from external environment. To date, all-inorganic CsPbX 3 (X = Cl, Br, and I) perovskite QDs (PeQDs) have been successfully precipitated in a variety of glasses via in situ nucleation/growth.…”

Synergy of 3D and 2D Perovskites for Durable, Efficient Solar Cells and Beyond

“…417,422 Encapsulation of halide perovskite devices can significantly enhance their stability in harsh environmental conditions. 472 Encapsulated devices have retained >95% of their initial PCE after 1000 h at 85 °C/85%RH, 2000 h of outdoor testing, and 5 h submerged in water. Encapsulation not only prevents the ingress of O 2 and H 2 O but also prevents the outgassing of volatile halide perovskite degradation products which allows for self-healing when the degrading condition is removed.…”

“…Encapsulation of halide perovskite devices can significantly enhance their stability in harsh environmental conditions . Encapsulated devices have retained >95% of their initial PCE after 1000 h at 85 °C/85%RH, 2000 h of outdoor testing, and 5 h submerged in water.…”

“…When devices are encapsulated, the encapsulation procedure is also not standardized across papers, and not all encapsulation is equally effective. 472 In order to better understand the present and future state-of-the-art for halide perovskite stability, the field must adopt a standardized and easily replicable set of degradation conditions. Recent progress has been made toward this goal, e.g., through the 2020 consensus statement for stability assessment which advocates for the use of modified International Summit on Organic Photovoltaic Stability (ISOS) testing protocols.…”

“…Elevated temperature tests have also been reported in air (e.g., ref ) or in N 2 (e.g., ref ). When devices are encapsulated, the encapsulation procedure is also not standardized across papers, and not all encapsulation is equally effective . In order to better understand the present and future state-of-the-art for halide perovskite stability, the field must adopt a standardized and easily replicable set of degradation conditions.…”