Ethanol induced structure reorganization of 2D layered perovskites (OA)2(MA)n-1PbnI3n+1

Yan, Hua; Hong, Daocheng; Wan, Sushu; Lei, Yanyu; Xie, Mingcai; Yang, Weiqing; Du, Yu; Tian, Yuxi

doi:10.1016/j.jlumin.2019.116981

Cited by 9 publications

(5 citation statements)

References 45 publications

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“…Such scattering features can be all related to the formation of an n = 2 RP phase analogous to the case of PEAI. [24,25] The peaks are more intense for the OAI-treated films than for the OABr-treated samples, as evidenced by comparing the sector averages in Figure S9 in the Supporting Information. For the films treated with OA, no secondary phase formation is observed, except for an OABr film showing low-intensity peaks at q of 0.52 and 0.78 Å −1 in Figure S9 (Supporting Information) sector average, which suggests an evolution toward structures with smaller interplanar spacing also for this cation, but over significantly longer timescales than PEAI.…”

Section: Heat Drives the Reconstruction Of The Bulky-cation Interfacementioning

confidence: 92%

Interface Reconstruction from Ruddlesden–Popper Structures Impacts Stability in Lead Halide Perovskite Solar Cells

et al. 2022

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The impact of the bulky‐cation‐modified interfaces on halide perovskite solar cell stability is underexplored. In this work, the thermal instability of the bulky‐cation interface layers used in the state‐of‐the‐art solar cells is demonstrated. X‐ray photoelectron spectroscopy and synchrotron‐based grazing‐incidence X‐ray scattering measurements reveal significant changes in the chemical composition and structure at the surface of these films that occur under thermal stress. The changes impact charge‐carrier dynamics and device operation, as shown in transient photoluminescence, excitation correlation spectroscopy, and solar cells. The type of cation used for surface treatment affects the extent of these changes, where long carbon chains provide more stable interfaces. These results highlight that prolonged annealing of the treated interfaces is critical to enable reliable reporting of performances and to drive the selection of different bulky cations.

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Section: Heat Drives the Reconstruction Of The Bulky-cation Interfacementioning

confidence: 92%

Interface Reconstruction from Ruddlesden–Popper Structures Impacts Stability in Lead Halide Perovskite Solar Cells

et al. 2022

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“…Such diffractions can be all related to the formation of a n=2 Ruddlesden-Popper phase analogously to the case of PEAI. (24,25) These diffractions are more intense for the OAI-treated film than the OABr-treated samples (Fig. 2H, Fig.…”

Section: Structure Of the Interface: Xps Sem Giwaxsmentioning

confidence: 94%

Preventing bulky cation diffusion in lead halide perovskite solar cells

Perini

Rojas-Gatjens

Rovello

et al. 2021

Preprint

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The impact on device stability of the bulky cation-modified interfaces in halide perovskite solar cells is not well-understood. We demonstrate the thermal instability of the bulky cation interface layers used in some of the highest performing solar cells to date. X-ray photoelectron spectroscopy and synchrotron-based grazing incidence X-ray scattering measurements reveal significant changes under thermal stress in the chemical composition and structure at the surface of these films. The changes impact charge carrier dynamics and device operation, as shown in transient photoluminescence, excitation correlation spectroscopy, and solar cells. The type of cation used for passivation affects the extent of these changes, where long carbon chains provide more stable interfaces and thus longer durability (more than 1000 hrs at 55ºC). Such findings highlight that annealing the treated interfaces before characterization is critical to enable reliable reporting of performances and to drive the selection between different cations.

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“…However, this transition requires temperatures above 100 °C, which is not desirable for low-temperature electronic applications. In contrast, low-dimensional HPs offer a much lower temperature for reversible chromism. − This is because the structural change is usually assisted by moistureas seen in the tuning of the MA 4 PbI 6 (0D) to MAPbI 3 (3D) structure in switchable photovoltaics . Apart from moisture, an organic solvent can also be used to enable solvatochromism in 2D HPs, which can significantly enhance the transition speeds (a few seconds or minutes in comparison to the hours in thermochromic CsPbBr 0.5 I 0.5 perovskite) .…”

mentioning

confidence: 99%

“…In contrast, low-dimensional HPs offer a much lower temperature for reversible chromism. − This is because the structural change is usually assisted by moistureas seen in the tuning of the MA 4 PbI 6 (0D) to MAPbI 3 (3D) structure in switchable photovoltaics . Apart from moisture, an organic solvent can also be used to enable solvatochromism in 2D HPs, which can significantly enhance the transition speeds (a few seconds or minutes in comparison to the hours in thermochromic CsPbBr 0.5 I 0.5 perovskite) . In a recent study, FA-based low-dimensional HPs have been shown to possess both excellent solvato- and thermochromism .…”

mentioning

confidence: 99%

Reversible Photochromism in ⟨110⟩ Oriented Layered Halide Perovskite

Kanwat

Ghosh

et al. 2022

ACS Nano

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Extending halide perovskites' optoelectronic properties to stimuli-responsive chromism enables switchable optoelectronics, information display, and smart window applications. Here, we demonstrate a band gap tunability (chromism) via crystal structure transformation from three-dimensional FAPbBr 3 to a ⟨110⟩ oriented FA n+2 Pb n Br 3n+2 structure using a mono-halide/cation composition (FA/Pb) tuning. Furthermore, we illustrate reversible photochromism in halide perovskite by modulating the intermediate n phase in the FA n+2 Pb n Br 3n+2 structure, enabling greater control of the optical band gap and luminescence of a ⟨110⟩ oriented monohalide/cation perovskite. Proton transfer reaction-mass spectroscopy carried out to precisely quantify the decomposition product reveals that the organic solvent in the film is a key contributor to the structural transformation and, therefore, the chromism in the ⟨110⟩ structure. These intermediate n phases (2 ≤ n ≤ ∞) stabilize in metastable states in the FA n+2 Pb n Br 3n+2 system, which is accessible via strain or optical or thermal input. The structure reversibility in the ⟨110⟩ perovskite allowed us to demonstrate a class of photochromic sensors capable of self-adaptation to lighting.

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Ethanol induced structure reorganization of 2D layered perovskites (OA)2(MA)n-1PbnI3n+1

Cited by 9 publications

References 45 publications

Interface Reconstruction from Ruddlesden–Popper Structures Impacts Stability in Lead Halide Perovskite Solar Cells

Interface Reconstruction from Ruddlesden–Popper Structures Impacts Stability in Lead Halide Perovskite Solar Cells

Preventing bulky cation diffusion in lead halide perovskite solar cells

Reversible Photochromism in ⟨110⟩ Oriented Layered Halide Perovskite

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