Degradation induced lattice anchoring self-passivation in CsPbI<sub>3−x</sub>Br<sub>x</sub>

Jiang, Xiaofeng; Dong, Bo; Driscoll, Elizabeth H.; Feng, Xiyuan; Muhammad, Abubakar; Chen, Shaoqing; Du, Zheng; Zhu, Yudong; Zhang, Zheng; Tang, Zhaoheng; He, Zhubing; Slater, Peter R.

doi:10.1039/d0ta02210a

Cited by 9 publications

(5 citation statements)

References 27 publications

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“…It was reported that the PbIOH byproduct was observed by decomposition of MAPbI 3 in high humidity . We have synthesized PbIOH powder, and its XRD pattern is displayed in Figure S22 , which is well-consistent with previous data reported elesewhere. − It is noted that the peaks at ca. 20.4° and 25.5° for PbIOH are overlapped with (−120) and (021) peaks of δ-FAPbI 3 .…”

supporting

confidence: 88%

Microencapsulation of Grain Boundaries for Moisture-Stable Perovskite Solar Cells

Choi,

Jeon,

Lee

et al. 2024

ACS Energy Lett.

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Enhancing the long-term moisture stability of perovskite solar cells remains a formidable challenge. In this study, we introduce an innovative approach involving in situ microencapsulation of grain boundaries using the polymeric epoxy curing reaction. This process involves the interaction between the epoxy resin of bisphenol A diglycidyl ether and the hardener of isophorone diamine to create a protective barrier at the perovskite grain boundaries. The microencapsulation serves a dual purpose: acting as a primary barrier for defect passivation and concurrently functioning as a secondary polymer spacer, effectively shielding the perovskite layer from water molecule intrusion. Consequently, the perovskite phase stability exhibits a remarkable 95-fold improvement against δ-FAPbI 3 and the accelerated formation of PbIOH under a relative humidity of 94%. The in situ microencapsulation not only improved the power conversion efficiency but also maintained 80% of the initial efficiency for 165 h under relative humidity of 70%.

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supporting

confidence: 88%

Microencapsulation of Grain Boundaries for Moisture-Stable Perovskite Solar Cells

Choi,

Jeon,

Lee

et al. 2024

ACS Energy Lett.

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“…Straining the substrate of a CsPbI 3 thin film was found to increase the thermodynamic stability of the film but did not enhance the moisture stability. [60] In contrast, a recent report [61] grew epitaxial PbI(OH) layers on γ-CsPbI 3 microcrystals that were synthesized in the presence of and stable to moisture, indicating the promise of epitaxial stabilization. We suggest the further exploration of epitaxial methods to stabilize perovskite-phase γ-CsPbI 3 because it is impossible to substitute a larger inorganic cation given that Cs + is the largest inorganic cation, so engineering approaches are therefore needed to work around the destabilizing effect of the rattling Cs + cation.…”

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confidence: 96%

Understanding the Instability of the Halide Perovskite CsPbI₃ through Temperature‐Dependent Structural Analysis

et al. 2020

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Despite the tremendous interest in halide perovskite solar cells, the structural reasons that cause the all‐inorganic perovskite CsPbI3 to be unstable at room temperature remain mysterious, especially since many tolerance‐factor‐based approaches predict CsPbI3 should be stable as a perovskite. Here single‐crystal X‐ray diffraction and X‐ray pair distribution function (PDF) measurements characterize bulk perovskite CsPbI3 from 100 to 295 K to elucidate its thermodynamic instability. While Cs occupies a single site from 100 to 150 K, it splits between two sites from 175 to 295 K with the second site having a lower effective coordination number, which, along with other structural parameters, suggests that Cs rattles in its coordination polyhedron. PDF measurements reveal that on the length scale of the unit cell, the PbI octahedra concurrently become greatly distorted, with one of the IPbI angles approaching 82° compared to the ideal 90°. The rattling of Cs, low number of CsI contacts, and high degree of octahedral distortion cause the instability of perovskite‐phase CsPbI3. These results reveal the limitations of tolerance factors in predicting perovskite stability and provide detailed structural information that suggests methods to engineer stable CsPbI3‐based solar cells.

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“…Surprisingly, after passivation by PYD and 2-MPYD, the average lifetimes were significantly increased to 21.54 and 25.77 ns, respectively. The prolonged lifetime of the PL decay may be attributed to the decreased concentration of defects at the surface of perovskite films. ,− Both of the optimized steady-state PL and TRPL results in the 2-MPYD-modified film may be due to the synergistic effect of the S atom in the mercapto group and the N atom in the pyridine ring, making surface defect passivation more effective.…”

Section: Resultsmentioning

confidence: 99%

Versatile Bidentate Chemical Passivation on a Cesium Lead Inorganic Perovskite for Efficient and Stable Photovoltaics

Gao

Zhang

et al. 2021

ACS Appl. Energy Mater.

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An all-inorganic CsPbI3 perovskite has exhibited some special excellent properties particularly high thermal stability and potential for tandem solar cells, yet its poor humidity stability and grain surface-dominated charge recombination severely hinder its applications. To overcome this dilemma, we explored a mixed-halide CsPbI2.85Br0.15 absorber layer by incorporating optimal Br ions into the CsPbI3 film (abbreviated as CsPbI3 – x Br x , x = 0.15). More importantly, versatile bidentate passivation of the CsPbI3 – x Br x perovskite is undertaken by using 2-mercaptopyridine (2-MPYD) to enhance anchoring strength, which can improve both passivation efficacy and moisture resistance simultaneously. Compared with monodentate pyridine, passivation via 2-MPYD shows better moisture resistance and longer photoluminescence lifetime. As a result, the power conversion efficiency enhanced significantly from 16.79 to 18.10% under 1 sun illumination with an open-circuit voltage (V OC) improving from 1.121 to 1.156 V, which corresponds to an E loss decrease from 0.59 to 0.55 eV. Moreover, the CsPbI3 – x Br x film treated with 2-MPYD exhibits higher humidity stability, as it can be exposed to high ambient humidity (RH, 45–55%) for 48 h. It is logically inferred that this versatile and efficient chemical passivation method can be applied to other similar perovskite materials.

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Degradation induced lattice anchoring self-passivation in CsPbI_3−xBr_x

Abstract: A facile ambient environment solution approach to prepare γ-CsPbI3−xBrx is reported for the first time, leading to samples that exhibit vastly improved stability towards both moisture and heating in air.

Cited by 9 publications

References 27 publications

Microencapsulation of Grain Boundaries for Moisture-Stable Perovskite Solar Cells

Microencapsulation of Grain Boundaries for Moisture-Stable Perovskite Solar Cells

Understanding the Instability of the Halide Perovskite CsPbI₃ through Temperature‐Dependent Structural Analysis

Versatile Bidentate Chemical Passivation on a Cesium Lead Inorganic Perovskite for Efficient and Stable Photovoltaics

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Degradation induced lattice anchoring self-passivation in CsPbI3−xBrx

Abstract: A facile ambient environment solution approach to prepare γ-CsPbI3−xBrx is reported for the first time, leading to samples that exhibit vastly improved stability towards both moisture and heating in air.

Cited by 9 publications

References 27 publications

Microencapsulation of Grain Boundaries for Moisture-Stable Perovskite Solar Cells

Microencapsulation of Grain Boundaries for Moisture-Stable Perovskite Solar Cells

Understanding the Instability of the Halide Perovskite CsPbI3 through Temperature‐Dependent Structural Analysis

Versatile Bidentate Chemical Passivation on a Cesium Lead Inorganic Perovskite for Efficient and Stable Photovoltaics

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Product

Resources

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Degradation induced lattice anchoring self-passivation in CsPbI_3−xBr_x

Understanding the Instability of the Halide Perovskite CsPbI₃ through Temperature‐Dependent Structural Analysis