CsPbBr₃ and CH₃NH₃PbBr₃ promote visible-light photo-reactivity

Abstract

Inorganic and organic lead halide perovskite materials attract great interest in the scientific community because of their potential for low-cost, high efficiency solar cells. In this report we add a new property of these materials, namely their photochemical activity in the visible light range. Both inorganic (CsPbBr3) and organic (CH3NH3PbBr3-MAPbBr3) perovskite thin films were demonstrated to promote photo-dissociation of adsorbed ethyl chloride (EC), employing 532 nm pulsed laser irradiation under ultra-high vacuum (UHV) conditions. From the post-irradiation temperature programmed desorption (TPD) analysis, the yield of photoproduct formation was found to be up to two orders of magnitude higher than for UV light-excited EC molecules on metallic and oxide surfaces. Photo-reactivity on top of the CsPbBr3 surface is almost an order of magnitude more efficient than on the CH3NH3PbBr3 surface, apparently due to the lower density of defect and surface states. A direct correlation was found between electron-induced luminescence and photoluminescence intensities and the photoreactivity cross-sections. We conclude that both the intense luminescence and the well-known photovoltaic properties associated with these halide perovskite materials are consistent with the efficiency of photo-reactivity in the visible range, reported here for the first time.

Effect of halide-mixing on tolerance factor and charge-carrier dynamics in (CH3NH3PbBr3−xClx) perovskites powders

“…activities, electrochemical water splitting, as well as solar cells and tandem solar cells [3][4][5][6][7][8].…”

Can perovskites be efficient photocatalysts in organic transformations?

“…In a typical photoreactivity (using 532 nm pulsed laser) demonstration to promote the dissociation of adsorbed ethyl chloride under ultra-high vacuum (UHV) conditions on the surfaces of the both inorganic (CsPbBr 3 ) and HOIP (CH 3 NH 3 -PbBr 3 -MAPbBr 3 ) thin lms, it was shown that the photoreactivity on the inorganic surface is more efficient than on the hybrid perovskite surface, which is attributed to the lower density of defects and surface states in CsPbBr 3 than in MAPbBr 3 . 50 A schematic of the overall photoreactivity on the surfaces of both CsPbBr This journal is © The Royal Society of Chemistry 2022 photocatalyzation of the a-alkylation reaction, with a high yield and a turnover number (TON) of over 52 000, which is higher in magnitude (3 orders) than precious Ir or Ru catalysts using CsPbBr 3 NCs (see Table 3). CsPbBr 3 NCs emissive colloid suspensions with sizes and photoluminescence lifetimes of 2-100 nm and $10 to $100 ns, respectively, were synthesized by a single-pot emulsion/de-emulsion effect (Fig.…”

“…In a typical photoreactivity (using 532 nm pulsed laser) demonstration to promote the dissociation of adsorbed ethyl chloride under ultra-high vacuum (UHV) conditions on the surfaces of the both inorganic (CsPbBr 3 ) and HOIP (CH 3 NH 3 PbBr 3 –MAPbBr 3 ) thin films, it was shown that the photoreactivity on the inorganic surface is more efficient than on the hybrid perovskite surface, which is attributed to the lower density of defects and surface states in CsPbBr 3 than in MAPbBr 3 . 50 A schematic of the overall photoreactivity on the surfaces of both CsPbBr 3 and CH 3 NH 3 PbBr 3 is shown in Fig. 2a.…”

Surfactant-Free Synthesis of the Full Inorganic Perovskite CsPbBr3: Evolution and Phase Stability of CsPbBr3 vs CsPb2Br5 and Their Photocatalytic Properties

“…In particular, one of the most emerging applications of AIHP materials is with regard to the wastewater purification process of textile effluents from industrial production. , In this field, heterogeneous catalysis under light is widely accepted due to its high efficiency, yield of degradation, and cost effectiveness. Moreover, CsPbX 3 (X = Cl, Br, I) perovskites, in the form of quantum dots (QDs), show photoelectrochemical degradation processes of different organic dye compounds , and high performance in hydrogen evolution under visible-light irradiation . In addition, it has been widely demonstrated that CsPbBr 3 nanocrystals are also exceptional candidates as photocatalysts for fundamental organic reactions: for example, C–C, C–N, and C–O bond formations and CO 2 reduction. , Finally, CsPbBr 3 and CsPb 2 Br 5 have been deeply studied as highly stable humidity sensor systems …”

“…39,40 In this field, heterogeneous catalysis under light is widely accepted due to its high efficiency, yield of degradation, and cost effectiveness. Moreover, CsPbX 3 (X = Cl, Br, I) perovskites, in the form of quantum dots (QDs), show photoelectrochemical degradation processes of different organic dye compounds 41,42 and high performance in hydrogen evolution under visible-light irradiation. 43 In addition, it has been widely demonstrated that CsPbBr 3 nanocrystals are also exceptional candidates as photocatalysts for fundamental organic reactions: for example, C−C, C−N, and C−O bond formations 44 and CO 2 reduction.…”