Strain‐Mediated Phase Stabilization: A New Strategy for Ultrastable α‐CsPbI<sub>3</sub> Perovskite by Nanoconfined Growth

Ma, Sunihl; Kim, Seong Hun; Jeong, Beomjin; Kwon, Hyeok Chan; Yun, Seong Cheol; Jang, Gyumin; Yang, Hyun-Ik; Park, Cheolmin; Lee, Donghwa; Moon, Jooho

doi:10.1002/smll.201900219

Cited by 83 publications

(71 citation statements)

References 68 publications

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“… 8 It is possible that the lattice distortion and strain of the NWs in AAO contribute to the stabilization of cubic-phase CsPbBr 3 NWs in our samples based on the previous studies of strain-stabilized cubic CsPbI 3 and FAPbI 3 grown from low-temperature solution. 46 , 47 …”

Section: Resultsmentioning

confidence: 99%

Vertically Aligned CsPbBr₃ Nanowire Arrays with Template-Induced Crystal Phase Transition and Stability

Zhang

Suchan

et al. 2021

J. Phys. Chem. C

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Metal halide perovskites show great promise for a wide range of optoelectronic applications but are plagued by instability when exposed to air and light. This work presents low-temperature solution growth of vertically aligned CsPbBr 3 nanowire arrays in AAO (anodized aluminum oxide) templates with excellent stability, with samples exposed to air for 4 months still exhibiting comparable photoluminescence and UV stability to fresh samples. The single-crystal nanowire length is adjusted from ∼100 nm to 5 μm by adjusting the precursor solution amount and concentration, and we observe length-to-diameter ratios as high as 100. Structural characterization results indicate that large-diameter CsPbBr 3 nanowires have an orthorhombic structure, while the 10 nm- and 20 nm-diameter nanowires adopt a cubic structure. Photoluminescence shows a gradual blue-shift in emission with decreasing nanowire diameter and marginal changes under varying illumination power intensity. The CsPbBr 3 -nanowires/AAO composite exhibits excellent resistance to X-ray radiation and long-term air storage, which makes it promising for future optoelectronic applications such as X-ray scintillators. These results show how physical confinement in AAO can be used to realize CsPbBr 3 nanowire arrays and control their morphology and crystal structure.

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Section: Resultsmentioning

confidence: 99%

Vertically Aligned CsPbBr₃ Nanowire Arrays with Template-Induced Crystal Phase Transition and Stability

Zhang

Suchan

et al. 2021

J. Phys. Chem. C

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“…m 2 mol -1 . 52 On the other hand, Ma et al 43 demonstrated through XRD measurements that the dimensions of the template dictate the strain level to confine the perovskite growth. The microstrain was varied from 1.1 % when CsPbI3 was grown into a 69 nm-pore sized anodized aluminum oxide (AAO) template to 2.0 % by growing the iodide perovskite into a 30 nm-pore sized AAO template.…”

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confidence: 99%

Stabilization of Black Perovskite Phase in FAPbI₃ and CsPbI₃

2020

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While halide perovskite allows a great versatility, the application on single absorber solar cells restrings significantly the number of available materials. In this context, CsPbI3 and FAPbI3 (FA, formamidinium) present a huge potentiality for the inorganic nature with enhanced stability the former and the narrow bandgap the later. However, for these materials, Cs + and FA + are too small and too big relatively, to stabilize the perovskite black phase at room temperature, presenting both a yellow phase non-photoactive as the most stable phase. This fact limits dramatically their application and also help to understand the main research lines in halide perovskite photovoltaics field as the quest for the stabilization of FAPbI3. In this perspective, we overview different strategies for the stabilization of the perovskite black phase of these two materials. We evaluate the stability approaches envisioning efficient and stable materials, with a particular focus to the positive and limiting aspects of the low dimensionality and chemi-structural mechanisms exploitation.

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“…It is worth noting that such mechanism of strain variation is individual in comparison with the case of additive engineering. The latter is associated with the insertion or substitution of extrinsic ions, whereas the former, in the current study, is attributed to the tensile stress between the inner walls of ZrSBA‐15 and perovskite crystals while constraining the shrinkage during crystallization [31a,38a] …”

Section: Resultsmentioning

confidence: 64%

Nanoconfined Crystallization for High‐Efficiency Inorganic Perovskite Solar Cells

Xiao

Wang

et al. 2021

Small Science

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Given that thermal stability is of considerable importance in the field of photovoltaics, inorganic perovskites have attracted numerous attempts to overcome instability caused by volatile cations in organic–inorganic hybrid perovskites. As always, crystallization optimization is a paramount strategy to enhance the performance of inorganic perovskite‐based solar cells. Recently, nanoconfined crystallization is regarded as a novel and effective strategy due to the absence of chemical reactions. Herein, 1D ordered mesoporous silica is introduced into inorganic perovskite precursors to facilely induce the nanoconfined crystallization. Both theoretical and experimental analyses verify that the nanoconfined crystallization is successfully triggered by the ordered mesoporous silica, fostering the formation of 1D perovskite monocrystal. In addition, the crystallization and morphology of inorganic perovskite are effectively facilitated. As a result, the nonradiative recombination is suppressed along with the distinctly reduced trap‐state density and remarkably enhanced charge transport in perovskite. Finally, the power conversion efficiencies of CsPbIBr2‐ and CsPbI3‐based solar cells are boosted from 8.67% to 10.04% and from 14.10% to 14.69%, respectively. Meanwhile, stability tests of solar cells also show enhancement using the nanoconfined crystallization. This work provides a facile, effective, and flexible crystallization modulating strategy for fabricating efficient and stable inorganic perovskite solar cells.

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Strain‐Mediated Phase Stabilization: A New Strategy for Ultrastable α‐CsPbI₃ Perovskite by Nanoconfined Growth

Cited by 83 publications

References 68 publications

Vertically Aligned CsPbBr₃ Nanowire Arrays with Template-Induced Crystal Phase Transition and Stability

Vertically Aligned CsPbBr₃ Nanowire Arrays with Template-Induced Crystal Phase Transition and Stability

Stabilization of Black Perovskite Phase in FAPbI₃ and CsPbI₃

Nanoconfined Crystallization for High‐Efficiency Inorganic Perovskite Solar Cells

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Strain‐Mediated Phase Stabilization: A New Strategy for Ultrastable α‐CsPbI3 Perovskite by Nanoconfined Growth

Cited by 83 publications

References 68 publications

Vertically Aligned CsPbBr3 Nanowire Arrays with Template-Induced Crystal Phase Transition and Stability

Vertically Aligned CsPbBr3 Nanowire Arrays with Template-Induced Crystal Phase Transition and Stability

Stabilization of Black Perovskite Phase in FAPbI3 and CsPbI3

Nanoconfined Crystallization for High‐Efficiency Inorganic Perovskite Solar Cells

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Product

Resources

About

Strain‐Mediated Phase Stabilization: A New Strategy for Ultrastable α‐CsPbI₃ Perovskite by Nanoconfined Growth

Vertically Aligned CsPbBr₃ Nanowire Arrays with Template-Induced Crystal Phase Transition and Stability

Vertically Aligned CsPbBr₃ Nanowire Arrays with Template-Induced Crystal Phase Transition and Stability

Stabilization of Black Perovskite Phase in FAPbI₃ and CsPbI₃