Reversible Phase Transformation of Colloidal 2D Lead Halide Perovskite Platelets under Photoirradiation

Hiott, Nathaniel; Chakkamalayath, Jishnudas; Kamat, Prashant V.

doi:10.1021/acsmaterialslett.3c00729

Cited by 3 publications

(3 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recently, Kamat and colleagues have investigated the important role of spacer ligands in stabilizing the 2D perovskites by mixing and segregating of halide phase in 2D perovskites with different spacer cations of linear BA and aromatic PEA. [15,18,36,51] Indeed, the intercalated ligands can serve as a halide migration barrier, and the aromatic spacer ligands are more effective than linear ones in terms of maintaining the stability of halides. [15,36,52,53] By tracking in situ and ex situ spectroscopic changes, a comprehensive understanding of the kinetics of halide ion migration and resulting stability across 2D versus 3D metal halide perovskites can be gained.…”

Section: Introductionmentioning

confidence: 99%

“…[15,36,52,53] By tracking in situ and ex situ spectroscopic changes, a comprehensive understanding of the kinetics of halide ion migration and resulting stability across 2D versus 3D metal halide perovskites can be gained. [15,18,36,51] In this study, we have further elucidated the important role of binding mode determined by the coordinating nature of spacer ligands in 2D perovskites: monodentate (BA) with RP versus bidentate (BDA) with DJ perovskites. We examined the important role of spacer ligands (BA vs BDA) as well as their binding mode (RP vs DJ) in maintaining the halide ion stability given halide mixing chemical potential.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Halide Ion Mobility in Paired 2D Halide Perovskites: Ruddlesden–Popper Versus Dion–Jacobson Phases

Min,

Cho

2024

Advanced Optical Materials

View full text Add to dashboard Cite

Abstract2D lead halide perovskites with tunable optoelectronic properties through modulating inorganic components and organic spacer ligands represent a promising candidate in perovskite optoelectronics. However, an intrinsic soft lattice of perovskites gives rise to a vacancy‐mediated halide ion migration, which further affects the long‐term stability of materials as well as devices. Here, halide ion mobility is evaluated using two different 2D perovskites yielded with butylammonium (BA) for the Ruddlesden–Popper (RP) phase and butane‐1,4‐diamine (BDA) for the Dion–Jacobson (DJ) phase, respectively. By probing the halide ion migration kinetics in the physically paired 2D bromide and iodide perovskite films, the softer lattice (RP) shows a lower activation energy of 50.9 kJ mol−1 as compared to that of more rigid lattice (DJ) of 60.8 kJ mol−1. Given similar halide diffusion pathlength and halide mixing chemical potential, the binding mode (RP and DJ) can indeed dictate the overall halide ion stability. Understanding such halide ion mobility is important in designing perovskites with increased stability and performances at material and device levels.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Halide Ion Mobility in Paired 2D Halide Perovskites: Ruddlesden–Popper Versus Dion–Jacobson Phases

Min,

Cho

2024

Advanced Optical Materials

View full text Add to dashboard Cite

show abstract

“…Also, we introduced a simple proton-induced structural and optical recovery process of photodegraded RP NPl . Most recently, Kamat and his co-workers reported a case of reversible phase transformation for colloidal mixed halide 2D RP NPl under 405 nm LASER excitation …”

Section: Introductionmentioning

confidence: 99%

Enhanced Photostability of the Colloidal Ruddlesden–Popper Perovskite Nanoplate through 4-Fluorobenzylammonium Iodide-Mediated Surface Engineering for Photoluminescent Application

Sen,

Sarkar,

Sen

2024

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

UV light-induced photodegradation of the organic− inorganic hybrid (OIH) Ruddlesden−Popper (RP) perovskite nanoplates (NPls) is a crucial bottleneck for optoelectronic application in the future. Continuous UV exposure triggers the deprotonation of the spacer as well as the A-site cation (CH 3 NH 3 + ), ultimately leading to lattice collapse. To combat this photoinstability, we introduce a surface modification of colloidal OIH RP NPls, (OAm) 2 (CH 3 NH 3 PbI 3 ) 2 PbI 4 (n = 3) (OAm stands for oleylammonium cation) by 4-fluorobenzylammonium iodide (4FBAI). In ambient conditions, conventional NPls deteriorate within 80 min of UV exposure, whereas the 4FBAImodified NPls exhibit remarkable endurance, maintaining structural integrity for 12 h with only a 11% reduction in the initial photoluminescence (PL). Interestingly, benzylammonium iodide (BAI) and 4-methoxybenzylammonium iodide (4OBAI)-treated NPl fail to provide similar photostability, thus signifying the importance of the fluorine atom. The fluorine atom enhances the positive charge density of the ammonium ion and facilitates faster deprotonation compared to parental ammonium ions (here, OAm + and CH 3 NH 3 + ) under UV exposure. This ensures the survival of the parent nanoplate structure. Along with the photostability enhancement, the PL quantum yield of the treated NPl also increases to 50 ± 2 from 35 ± 2%. This research not only addresses the pressing photostability issue of RP NPl stability but also illuminates the pivotal role of specific chemical modifications, such as fluorine atom incorporation, for the fabrication of UV-stable perovskite devices in the future.

show abstract

Structural Evolution of Perovskite Nanoplatelets in Polar Solvents

Chemmangat,

Chakkamalayath,

Kamat

2024

ACS Materials Lett.

View full text Add to dashboard Cite

Tuning the absorption and emission properties of two-dimensional (2D) metal halide perovskites with layer numbers and halide composition offers a convenient way to utilize these materials in optoelectronic applications. When prepared as a colloidal suspension in toluene, these 2D nanoplatelets (NPLs) exhibit good stability. However, introduction of even a small amount of polar solvent (e.g., isopropanol) causes the NPLs to grow into a greater number of layered NPLs, eventually leading to bulk nanostructures. By controlling the addition of a polar solvent, we have now resolved the growth of NPLs from n = 2 to n = 3, 4, and >4 over an extended period of ripening. The energy transfer that occurs between higher bandgap NPLs (lower n) and lower bandgap NPLs (higher n) within the same suspension is analyzed using time-resolved transient absorption spectroscopy. The funneling of energy transfer between different layers outcompetes the excitonic recombination process, thus increasing the emission yield and lifetime.

show abstract

Reversible Phase Transformation of Colloidal 2D Lead Halide Perovskite Platelets under Photoirradiation

Cited by 3 publications

References 43 publications

Halide Ion Mobility in Paired 2D Halide Perovskites: Ruddlesden–Popper Versus Dion–Jacobson Phases

Halide Ion Mobility in Paired 2D Halide Perovskites: Ruddlesden–Popper Versus Dion–Jacobson Phases

Enhanced Photostability of the Colloidal Ruddlesden–Popper Perovskite Nanoplate through 4-Fluorobenzylammonium Iodide-Mediated Surface Engineering for Photoluminescent Application

Structural Evolution of Perovskite Nanoplatelets in Polar Solvents

Contact Info

Product

Resources

About