A Confined Fabrication of Perovskite Quantum Dots in Oriented MOF Thin Film

Abstract

Organic-inorganic hybrid lead organohalide perovskites are inexpensive materials for high-efficiency photovoltaic solar cells, optical properties, and superior electrical conductivity. However, the fabrication of their quantum dots (QDs) with uniform ultrasmall particles is still a challenge. Here we use oriented microporous metal-organic framework (MOF) thin film prepared by liquid phase epitaxy approach as a template for CHNHPbIX (X = Cl, Br, and I) perovskite QDs fabrication. By introducing the PbI and CHNHX (MAX) precursors into MOF HKUST-1 (Cu(BTC), BTC = 1,3,5-benzene tricarboxylate) thin film in a stepwise approach, the resulting perovskite MAPbIX (X = Cl, Br, and I) QDs with uniform diameters of 1.5-2 nm match the pore size of HKUST-1. Furthermore, the photoluminescent properties and stability in the moist air of the perovskite QDs loaded HKUST-1 thin film were studied. This confined fabrication strategy demonstrates that the perovskite QDs loaded MOF thin film will be insensitive to air exposure and offers a novel means of confining the uniform size of the similar perovskite QDs according to the oriented porous MOF materials.

Strong Quantum Confinement and Fast Photoemission Activation in CH3NH3PbI3 Perovskite Nanocrystals Grown within Periodically Mesostructured Films

“…This prevents their infiltration with perovskite precursors. Very recently, MAPbI 2 X (X = Cl, Br, I) compounds have been synthesized inside metal organic framework films, [16] but no control over the size and optical properties of MAPbI 3 was demonstrated.…”

“…This prevents their infiltration with perovskite precursors. Very recently, MAPbI 2 X (X = Cl, Br, I) compounds have been synthesized inside metal organic framework films, [16] but no control over the size and optical properties of MAPbI 3 was demonstrated.In this Communication, we demonstrate a synthetic route to obtain stabilized MAPbI 3 nanocrystals embedded in thin metal oxide films that display well-defined and adjustable quantum confinement effects over a wide range of 0.34 eV. Mesostructured TiO 2 and SiO 2 films displaying an ordered 3D pore network are prepared by evaporation induced self-assembly of a series of organic supramolecular templates in the presence of metal oxide precursors.…”

Facile Two‐Step Synthesis of All‐Inorganic Perovskite CsPbX3 (X = Cl, Br, and I) Zeolite‐Y Composite Phosphors for Potential Backlight Display Application

“…[24,25] However, the main drawback of the perovskite QDs is the poor chemical stability under ambient conditions. [33] Porous zeolites are an especially interesting host to encapsulate and stabilize perovskite QDs, because the resulting micrometer-sized composites would be directly compatible with mature packaging techniques for commercial WLEDs. [26,27] In attempts to improve the stability, perovskite QDs have been embedded in polymer matrices such as poly methyl methacrylate (PMMA) or polystyrene [5,8,11,14,20] or polyethylene oxide with further antisolvent vapor treatment, [28] coated with strongly binding ligands [29,30] or silica, [26,27,31,32] or confined in metal-organic frameworks.…”

Encapsulating Perovskite Quantum Dots in Iron‐Based Metal–Organic Frameworks (MOFs) for Efficient Photocatalytic CO2 Reduction

“…[24][25][26][27][28][29][30][31][32][33] In photocatalytic CO 2 reduction, LHP QDs have been demonstrated to be capable of converting CO 2 into CO and CH 4 . [34][35][36][37] 2) Apart from good catalytic activity of MOFs for the conversion of CO 2 , [34,[38][39][40][41] the framework of MOFs can improve the stability of LHP QDs. However, the insufficient stability of LHP QDs and the lack of effective catalytic sites limit their photocatalytic performance for CO 2 reduction.…”

“…[27] Loading LHP QDs on graphene oxide [26] or g-C 3 N 4 [24] can facilitate the charge separation, bringing forth improved catalytic performance for CO 2 reduction. [37,42] 3) Thec lose contact of LHP QDs to the catalytic active center in MOFs can shorten the charge-transfer distance,t hus enhancing the photo-induced charge separation efficiencyo fL HP QDs and catalytic activity of MOFs.A sexpected, all the MAP-bI 3 @PCN-221(Fe x )c omposite photocatalysts exhibit much enhanced photocatalytic stability and activity for CO 2 reduction compared with pure QDs and corresponding PCN-221(Fe x ), getting record-high stability (over 80 h) and yield for the productions of CO and CH 4 (1559 mmol g À1 ). To overcome these obstacles,w ee ncapsulated LHP QDs of CH 3 NH 3 PbI 3 (MAPbI 3 )i nt he pores of Feporphyrin based metal organic frameworks (MOFs) of PCN-221(Fe x )t oc onstruct as eries of composite photocatalysts of MAPbI 3 @PCN-221(Fe x )f or visible-light-driven CO 2 reduction (x = 0-1).…”