Organic Matrix Assisted Low‐temperature Crystallization of Black Phase Inorganic Perovskites

Chen, Yuetian; Liu, Xiaomin; Zhao, Yixin

doi:10.1002/ange.202110603

Cited by 8 publications

(10 citation statements)

References 137 publications

(185 reference statements)

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“…The three-dimensional (3D) organic–inorganic hybrid perovskite solar cells (PSCs) have gained massive attention during the past decade, with a certified PCE reaching 25.7%. − However, the poor thermal stability of 3D organic–inorganic hybrid PSCs hinders their commercial application due to the volatility of organic molecules, such as methylammonium (MA) and formamidinium (FA) . Replacing volatile organic components with inorganic cation cesium (Cs) has been widely researched due to its potential to improve the intrinsic stability of PSCs. − …”

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confidence: 99%

Phase-Pure γ-CsPbI₃for Efficient Inorganic Perovskite Solar Cells

et al. 2022

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Cesium lead triiodide (CsPbI3) has attracted enormous attention due to its outstanding thermal stability and ideal bandgap (∼1.75 eV) for tandem applications. However, it is still challenging to prepare high-efficiency fully inorganic CsPbI3 perovskite solar cells. In this work, we developed a formamidine acetate (FAAc)-assisted strategy to prepare phase-pure high-quality γ-CsPbI3 perovskite film on a planar substrate. Mechanistic studies reveal that the incorporation of FAAc into perovskite precursor solution alters the phase transition process with an additional intermediate phase formation, which leads to an improved crystallinity of γ-CsPbI3 film and better interfacial contact. As a result, the FAAc-assisted γ-CsPbI3 solar cells exhibit a power conversion efficiency (PCE) of over 18% and retain 95% of the initial efficiency after 30 days of aging.

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confidence: 99%

Phase-Pure γ-CsPbI₃for Efficient Inorganic Perovskite Solar Cells

et al. 2022

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“…3,4 To address this issue, the utilization of inorganic cations, such as Cs + , in place of organic cations has been considered as an effective strategy. 5 Therein, CsPbI 3 with a suitable band gap (E g = 1.73 eV) and excellent thermal stability is identified as an ideal broad band gap perovskite material. 6,7 Unfortunately, the radius of Cs + is too small to maintain the [PbI 6 ] − octahedron structure, resulting in a small Goldschmidt tolerance coefficient of CsPbI 3 .…”

Section: ■ Introductionmentioning

confidence: 99%

Efficient and Stable β-CsPbI₃Solar Cells through Solvent Engineering with Methylamine Acetate Ionic Liquid

Zhou

et al. 2023

ACS Appl. Mater. Interfaces

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CsPbI 3 , an all-inorganic perovskite material with suitable band gap and excellent thermal stability, has garnered significant attention for its potential in perovskite solar cells (PSCs). However, CsPbI 3 is susceptible to phase changes from photoactive to photoinactive in humid environments. Hence, it is crucial to achieve controllable growth of CsPbI 3 perovskite thin films with the desired β-crystal phase and compact morphology for efficient and stable PSCs. Herein, MAAc was used as a solvent for the CsPbI 3 precursor to fabricate β-CsPbI 3 perovskite. An intermediate compound of Cs x MA 1−x PbI x Ac 3−x was initially formed in the MAAc solution, and during annealing, the MA + and Ac − ions were replaced by Cs + and I − ions, respectively. Furthermore, the incorporation of strong C�O•••Pb coordination stabilized the black-phase β-CsPbI 3 and facilitated the growth of crystals with a narrow vertical orientation and large grain size. As a result, the PSCs with an efficiency of 18.9% and improved stability (less than 10% decay after 2000 h of storage in N 2 and less than 30% decay after 500 h of storage in humid air without any encapsulation) were achieved.

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“…All inorganic cesium lead halides (CsPbX3 , X = Cl, Br, I) and hybrid methylammonium lead halides (MAPbX3) are important functional materials [1][2][3][4][5] that can be synthesized as crystals, thinfilms, and nanomaterials with varied morphologies. 5,[6][7][8][9][10][11][12][13]14 Two dimensional (2D) plates and platelets are common, with thicknesses of only a few monolayers (ML) often observed, and lengths varied from nanometers to microns, which are formed during nucleation and growth, or self-assembled via solvent and or ligand mediated interactions.…”

Section: Introductionmentioning

confidence: 99%

Tailoring CsPbBr3 Growth Via Non-Polar Solvent Choice and Heating Method

Zamani

Chiang

Klotz

et al. 2022

Preprint

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This study describes an investigation of the role of non-polar solvents on the growth of cesium lead halide (CsPbX3 X = Br, I) nanoplatelets. We employed two solvents, benzyl ether (BE), and 1-octadecene (ODE), as well as two nucleation and growth mechanisms, one-pot, facilitated by microwave irradiation (MWI) based heating, and hot-injection, using conventional heating. Using BE and MWI, large mesoscale CsPbBr3 nanoplatelets were produced, whereas use of ODE produced thin small crystallites. Differences between the products were observed by optical spectroscopies, which showed first band edge absorptions consistent with thicknesses of ~ 9 nm (~15 monolayer (ML)) for the BE-CsPbBr3, and ~5 nm (~9 ML) for ODE-CsPbBr3. Both products had orthorhombic crystal structure, with the BE-CsPbBr3 revealing significant preferred orientation diffraction signals consistent with the asymmetric and two-dimensional (2D) platelet morphology. The differences in final morphology were also observed for products formed via hot-injection, with BE-CsPbBr3 showing thinner square platelets with thicknesses of ~2 ML, and ODE-CsPbBr3 showing similar morphologies and small crystallite sizes. To understand the role solvent plays in crystal growth, we studied lead plumbate precursor (PbBrn2-n) formation in both solvents, as well as solvent plus ligand solutions. The findings suggest that BE dissolves PbBr2 salts to a higher degree than ODE, and that this BE to precursor affinity persists during growth.

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Organic Matrix Assisted Low‐temperature Crystallization of Black Phase Inorganic Perovskites

Cited by 8 publications

References 137 publications

Phase-Pure γ-CsPbI₃for Efficient Inorganic Perovskite Solar Cells

Phase-Pure γ-CsPbI₃for Efficient Inorganic Perovskite Solar Cells

Efficient and Stable β-CsPbI₃Solar Cells through Solvent Engineering with Methylamine Acetate Ionic Liquid

Tailoring CsPbBr3 Growth Via Non-Polar Solvent Choice and Heating Method

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Organic Matrix Assisted Low‐temperature Crystallization of Black Phase Inorganic Perovskites

Cited by 8 publications

References 137 publications

Phase-Pure γ-CsPbI3for Efficient Inorganic Perovskite Solar Cells

Phase-Pure γ-CsPbI3for Efficient Inorganic Perovskite Solar Cells

Efficient and Stable β-CsPbI3Solar Cells through Solvent Engineering with Methylamine Acetate Ionic Liquid

Tailoring CsPbBr3 Growth Via Non-Polar Solvent Choice and Heating Method

Contact Info

Product

Resources

About

Phase-Pure γ-CsPbI₃for Efficient Inorganic Perovskite Solar Cells

Phase-Pure γ-CsPbI₃for Efficient Inorganic Perovskite Solar Cells

Efficient and Stable β-CsPbI₃Solar Cells through Solvent Engineering with Methylamine Acetate Ionic Liquid