Compositional gradient engineering and applications in halide perovskites

Li, Junyu; Han, Zeyao; Liu, Jiaxin; Zou, Yousheng; Xu, Xiaobao

doi:10.1039/d3cc00967j

Cited by 9 publications

(2 citation statements)

References 106 publications

(189 reference statements)

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“…The search for new materials for efficient and cost-effective harvesting of light energy has been hovering around lead halide perovskites for the past decade, owing to their high extinction coefficient, absorption in a broad wavelength range, and large exciton diffusion lengths. − More interestingly, the emission of lead halide perovskites can be tuned in the entire visible region, by postsynthetic anion exchange reaction, in an easier manner. − The emission quantum yield of the lead halide perovskites is close to unity and also shows an exceptional electroluminescent yield with a fairly narrow emission profile. − Thus, lead halide perovskites are proposed as an alternate material for the fabrication of light-emitting diodes (LED), display devices, and sensors. ,− Apart from this, lead halide perovskite is the one of the materials that showed a commendable efficiency for solar cells, so far, in the laboratory. − Many of the interesting properties of lead halide perovskites are attributed to their peculiar crystal structure. − Even though lead halide perovskite proved its efficiency for various applications, the stability under ambient conditions is a major concern. − Lead halide perovskites are known to decompose in the presence of small molecules like water . Water is also known to be used as a greener solvent for the synthesis of lead halide perovskites at moderately high temperatures. , In order to improve the stability of lead halide perovskites under ambient conditions, especially in humid atmospheres, the exact mechanism of moisture-assisted decomposition needs to be understood.…”

Section: Introductionmentioning

confidence: 99%

“…10.1021/acsomega.3c09600. Materials, methods, synthesis of CsPbBr 3 nanocrystals, characterization, low-resolution TEM analysis, emission yield measurements, photographs of the precipitates formed after the decomposition of CsPbBr in the presence of H 2 S and H 2 O, qualitative tests, PXRD of the decomposed product in the presence of water, optimized geometry of the (001) plane, and intercalation studies in the CsPbBr 3 bulk structure (PDF)…”

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confidence: 99%

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Probing the Structural Degradation of CsPbBr₃ Perovskite Nanocrystals in the Presence of H₂O and H₂S: How Weak Interactions and HSAB Matter

Fausia,

Nharangatt,

Vinayakan

et al. 2024

ACS Omega

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Structural degradation of all inorganic CsPbBr 3 in the presence of moisture is considered as one of its major limitations to use as an active component in various lightharvesting and light-emitting devices. Herein, we used two similar molecules, H 2 O and H 2 S, with similar structures, to follow the decomposition mechanism of CsPbBr 3 perovskite nanocrystals. Interestingly, H 2 O acts as a catalyst for the decomposition of CsPbBr 3 , which is in contrast to H 2 S. Our experimental observations followed by density functional theory (DFT) calculations showed that the water molecule is intercalated in the CsPbBr 3 perovskite whereas H 2 S is adsorbed in the (100) planes of CsPbBr 3 by a weak electrostatic interaction. According to Pearson's hard−soft acid−base theory, both cations present in CsPbBr 3 prefer soft/intermediate bases. In the case of the water molecule, it lacks a soft base and thus it is not directly involved in the reaction whereas H 2 S can provide a soft base and thus it gets involved in the reaction. Understanding the mechanistic aspects of decomposition can give different methodologies for preventing such unwanted reactions.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Probing the Structural Degradation of CsPbBr₃ Perovskite Nanocrystals in the Presence of H₂O and H₂S: How Weak Interactions and HSAB Matter

Fausia,

Nharangatt,

Vinayakan

et al. 2024

ACS Omega

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Tableting Engineering in Halide Gradient Perovskite: Energy Band Regulation and Design of Carrier Dynamics for THz Sensing

Li,

Han,

et al. 2024

Adv Funct Materials

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Component regulation in perovskite single crystals (SCs) sets the precondition for designing energy band and carrier dynamics, which is essential for exploring functional optoelectronic devices. However, entropy‐driven ion diffusion in SCs leads to component homogenization in a few hours, while the gradient films exhibit long‐term gradient stability. Therefore, tableting engineering is proposed to introduce appropriate boundaries, ensuring good short‐range alignment within the grains and suppressed ion diffusion in the long range. With 6–10 MPa pressure, transverse/longitudinal gradient MAPbX3 (X = Cl, Br, I) tablets are constructed. Due to the alignment of the valence band maximum from MAPbCl3 to MAPbBr3 to MAPbI3, the hole extraction is significantly promoted. As well, different metal electrodes are utilized to regulate the main carrier types. Hole‐type Au/gradient tablet/Au devices show an obvious rectification effect, while electron‐type Ag/gradient tablet/Ag devices have near‐Ohmic contact. Compared to the electron‐type devices, Au/gradient tablet/Au devices show a 3.9‐fold improvement in terahertz responsivity to 3.51 µA W−1, a 2.6‐fold reduction in noise‐equivalent power to 2.22 × 10−8 W Hz−1/ 2; and a 2.6‐fold increase in specific detectivity to 1.89 × 107 Jones. This work demonstrates the tableting engineering to realize stable compositional gradients for energy band regulation in weak‐signal THz detection.

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Stabilization of halide perovskites with silicon compounds for optoelectronic, catalytic, and bioimaging applications

Jana,

Cho,

Meena

et al. 2024

InfoMat

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Silicon belongs to group 14 elements along with carbon, germanium, tin, and lead in the periodic table. Similar to carbon, silicon is capable of forming a wide range of stable compounds, including silicon hydrides, organosilicons, silicic acids, silicon oxides, and silicone polymers. These materials have been used extensively in optoelectronic devices, sensing, catalysis, and biomedical applications. In recent years, silicon compounds have also been shown to be suitable for stabilizing delicate halide perovskite structures. These composite materials are now receiving a lot of interest for their potential use in various real‐world applications. Despite exhibiting outstanding performance in various optoelectronic devices, halide perovskites are susceptible to breakdown in the presence of moisture, oxygen, heat, and UV light. Silicon compounds are thought to be excellent materials for improving both halide perovskite stability and the performance of perovskite‐based optoelectronic devices. In this work, a wide range of silicon compounds that have been used in halide perovskite research and their applications in various fields are discussed. The interfacial stability, structure–property correlations, and various application aspects of perovskite and silicon compounds are also analyzed at the molecular level. This study also explores the developments, difficulties, and potential future directions associated with the synthesis and application of perovskite‐silicon compounds.image

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Compositional gradient engineering and applications in halide perovskites

Abstract: Organic-inorganic halide perovskites (HPs) have attracted respectable interests as active layers in solar cells, light-emitting diodes, and photodetectors, etc. Besides the promising optoelectronic properties and solution-processed preparation, the soft lattice...

Cited by 9 publications

References 106 publications

Probing the Structural Degradation of CsPbBr₃ Perovskite Nanocrystals in the Presence of H₂O and H₂S: How Weak Interactions and HSAB Matter

Probing the Structural Degradation of CsPbBr₃ Perovskite Nanocrystals in the Presence of H₂O and H₂S: How Weak Interactions and HSAB Matter

Tableting Engineering in Halide Gradient Perovskite: Energy Band Regulation and Design of Carrier Dynamics for THz Sensing

Stabilization of halide perovskites with silicon compounds for optoelectronic, catalytic, and bioimaging applications

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Compositional gradient engineering and applications in halide perovskites

Abstract: Organic-inorganic halide perovskites (HPs) have attracted respectable interests as active layers in solar cells, light-emitting diodes, and photodetectors, etc. Besides the promising optoelectronic properties and solution-processed preparation, the soft lattice...

Cited by 9 publications

References 106 publications

Probing the Structural Degradation of CsPbBr3 Perovskite Nanocrystals in the Presence of H2O and H2S: How Weak Interactions and HSAB Matter

Probing the Structural Degradation of CsPbBr3 Perovskite Nanocrystals in the Presence of H2O and H2S: How Weak Interactions and HSAB Matter

Tableting Engineering in Halide Gradient Perovskite: Energy Band Regulation and Design of Carrier Dynamics for THz Sensing

Stabilization of halide perovskites with silicon compounds for optoelectronic, catalytic, and bioimaging applications

Contact Info

Product

Resources

About

Probing the Structural Degradation of CsPbBr₃ Perovskite Nanocrystals in the Presence of H₂O and H₂S: How Weak Interactions and HSAB Matter

Probing the Structural Degradation of CsPbBr₃ Perovskite Nanocrystals in the Presence of H₂O and H₂S: How Weak Interactions and HSAB Matter