Epitaxial Stabilization of Tetragonal Cesium Tin Iodide

Wang, Lili; Chen, Pei; Kuttipillai, Padmanaban S.; King, Isaac; Staples, Richard J.; Sun, Kai; Lunt, Richard R.

doi:10.1021/acsami.9b05592

Cited by 35 publications

(24 citation statements)

References 66 publications

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“…The ability to precisely grow epitaxial halide perovskite thin films, as well as halide perovskite quantum wells has recently been demonstrated ( Chen et al, 2017 , 2019 ; Oksenberg et al., 2020 ; Wang et al., 2017a , 2017b , 2019 ). The vapor phase epitaxy of our CsSnI 3 samples was achieved on lattice-matched metal halide crystals with congruent ionic bonding (see Figure 1 A) ( Hu et al., 2017 ; Wang et al., 2017b , 2019 ). The heteroepitaxy of these perovskite films allows for precise film thicknesses, controllable phase and orientation, integration into quantum wells, and opens the door to quantum transport devices.…”

Section: Introductionmentioning

confidence: 99%

Extraordinary phase coherence length in epitaxial halide perovskites

Nasyedkin

King²,

Zhang

et al. 2021

iScience

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Summary Inorganic halide perovskites have emerged as a promising platform in a wide range of applications from solar energy harvesting to computing and light emission. The recent advent of epitaxial thin film growth of halide perovskites has made it possible to investigate low-dimensional quantum electronic devices based on this class of materials. This study leverages advances in vapor-phase epitaxy of halide perovskites to perform low-temperature magnetotransport measurements on single-domain cesium tin iodide (CsSnI 3 ) epitaxial thin films. The low-field magnetoresistance carries signatures of coherent quantum interference effects and spin-orbit coupling. These weak anti-localization measurements reveal a micron-scale low-temperature phase coherence length for charge carriers in this system. The results indicate that epitaxial halide perovskite heterostructures are a promising platform for investigating long coherent quantum electronic effects and potential applications in spintronics and spin-orbitronics.

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Section: Introductionmentioning

confidence: 99%

Extraordinary phase coherence length in epitaxial halide perovskites

Nasyedkin

King²,

Zhang

et al. 2021

iScience

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“…16 Wang et al demonstrated epitaxial stabilization of CsSnI 3 film on a single-crystal potassium chloride substrate with a matched lattice. 17 Stabilizing CsSnI 3 perovskites by passivation of the surface and mixing A or M cations has also been reported. 18−20 Confronting the air instability of tin halide perovskites requires a better understanding of the mechanism in tin perovskite degradation.…”

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confidence: 99%

Confronting the Air Instability of Cesium Tin Halide Perovskites by Metal Ion Incorporation

Zhou

Zhu

Guan

et al. 2021

J. Phys. Chem. Lett.

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Tin halide perovskite's potential as a photovoltaic absorber has not been fully realized to date, largely due to its instability in ambient air. Here, we demonstrate by both experiments and simulations that the air instability of blackphase cesium tin iodide perovskite (γ-CsSnI 3 ) could be greatly lessened by a controlled incorporation of bismuth (Bi) ions into the crystal lattice. Hall effect measurements on films of γ-CsSnI 3 suggest the unwanted formation of a tin vacancy and p-type selfdoping can be effectively suppressed by the Bi incorporation. Structural and optical results indicate that the Bi incorporation markedly enhances the air stability by impeding the direct conversion of γ-CsSnI 3 to zero-dimensional Cs 2 SnI 6 . By using a stochastic surface walking (SSW) method integrating neural network (NN) potential and density functional theory (DFT), it is revealed that the remarkable enhanced stability could be attributed to a combination of factors originating from lattice-contraction-induced strain, a suppressed tin vacancy, and an increased energy barrier for the transformation of γ-CsSnI 3 to Cs 2 SnI 6 . This study provides physical insights into the stabilization mechanism of tin perovskites by heterovalent B-site engineering, paving the way for realizing stable and efficient lead-free perovskite photovoltaics.

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“…This can be realized because KCl matches the cubic lattice constant and maintains the ion bonding properties of CsSnI 3 . [121] This work provides a new idea for the stabilization of crystal phase of CsSnI 3 . In addition, Jiang et al studied the effect of cations and anions mixing (Rb/Cs cation exchange and Br/I anion exchange) on phase stabilization of CsSnI 3 by using density functional theory (DFT)-local density approximation (LDA) calculation.…”

Section: Future Opportunitiesmentioning

confidence: 93%

All‐inorganic Sn‐based Perovskite Solar Cells: Status, Challenges, and Perspectives

Liu¹,

Gao²,

Ran³

et al. 2020

ChemSusChem

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Recently, the power conversion efficiency (PCE) of perovskite solar cells (PSC) based on organic‐inorganic hybrid Pb halide perovskites has reached 25.2 %. However, the toxicity of Pb has still been a main concern for the large‐scale commercialization of Pb‐based PSCs. Efforts have been made during the past few years to seek eco‐friendly Pb‐free perovskites, and it is a growing consensus that Sn is the best choice as Pb alternative over any other Pb‐free metal elements. Among Sn‐based perovskites, all‐inorganic cells are promising candidates for PSCs owing to their more suitable bandgap, better stability, and higher charge mobility compared to the organic‐inorganic hybrid counterparts. However, the poor phase stability of all‐inorganic Sn‐based perovskites (AISPs) and low PCE of their PSCs are most challenging in the field at present. Herein, recent developments on PSCs based on AISPs, including CsSnX3 and Cs2SnX6 (X=Br, I), are comprehensively reviewed. Primarily, the intrinsic characteristics of the two AISPs are overviewed, including crystallographic property, band structure, charge carrier property, and defect property. Sequentially, state‐of‐the‐art progress, regarding the photovoltaic application of AISPs as light absorber, is summarized. At last, current challenges and future opportunities of AISP‐based PSCs are also discussed.

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Epitaxial Stabilization of Tetragonal Cesium Tin Iodide

Cited by 35 publications

References 66 publications

Extraordinary phase coherence length in epitaxial halide perovskites

Extraordinary phase coherence length in epitaxial halide perovskites

Confronting the Air Instability of Cesium Tin Halide Perovskites by Metal Ion Incorporation

All‐inorganic Sn‐based Perovskite Solar Cells: Status, Challenges, and Perspectives

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