Halide Perovskites: Suppressed Lattice Disorder for Large Emission Enhancement and Structural Robustness in Hybrid Lead Iodide Perovskite Discovered by High‐Pressure Isotope Effect (Adv. Funct. Mater. 9/2021)

Kong, Lingping; Gong, Jue; Hu, Qiao‐Sheng; Capitani, Francesco; Celeste, Anna; Hattori, Takanori; Sano‐Furukawa, Asami; Li, Nana; Yang, Wenge; Liu, Gang; Mao, Ho‐kwang

doi:10.1002/adfm.202170057

Cited by 4 publications

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“…Another challenge in the commercialization of PSCs is the defect-induced degradation under external stimuli, such as light, heat, O 2 , and H 2 O. − Many strategies for reducing the defect density, such as perovskite bulk and interface passivation, additive engineering, and contact layer development, have been implemented and reached remarkable progress in recent years. In particular, perovskite seed-assisted crystallization has been demonstrated as an effective method of reducing intrinsic perovskite bulk defects and has been applied in two-step sequential perovskite deposition and the printing-based fabrication of millimeter-scale single perovskite crystals. − However, this seeding technique is effective only when the colloidal seeds are mixed in PbI 2 solution; no perovskite seeds are formed if powder-form perovskite is added into the precursor.…”

Section: Introductionmentioning

confidence: 99%

Additive Engineering in Antisolvent for Widening the Processing Window and Promoting Perovskite Seed Formation in Perovskite Solar Cells

Chen

Zhou

Jiang

et al. 2022

ACS Appl. Mater. Interfaces

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The chlorobenzene (CB) antisolvent is widely used to fabricate high-efficiency perovskite solar cells (PSCs). However, the narrow processing window and the strict volume ratio of a binary mixed solvent limit the fabrication of large-area and high-quality perovskite films. In this work, by systematic investigation of additives with the CB antisolvent, a universal guideline is achieved wherein a small amount of additive with a donor number between 9.0 and 27.0 kcal/mol can significantly widen the antisolvent treating time slot from 2 to 40 s while simultaneously enlarging the processor binary mixed solvent (dimethylformamide/dimethyl sulfoxide) from 7:3 to 0:10. Moreover, this process facilitates the formation of perovskite seeds as templates for perovskite crystal growth, effectively reducing the bulk defects in perovskite films. Finally, the obtained PSCs show remarkable power conversion efficiencies (PCEs) of 22.22 and 19.74% for rigid and flexible devices, respectively.

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Section: Introductionmentioning

confidence: 99%

Additive Engineering in Antisolvent for Widening the Processing Window and Promoting Perovskite Seed Formation in Perovskite Solar Cells

Chen

Zhou

Jiang

et al. 2022

ACS Appl. Mater. Interfaces

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“…[ 29 , 30 , 31 ] In recent years, pressure engineering has demonstrated a promising path to pinpoint the properties of functional materials with atomic‐level understanding. [ 32 , 33 , 34 ] However, pressure‐driven structure transformation and phase transition are usually reversible. Thus, employing pressure as an effective post‐synthesis method must ensure that the high‐pressure metastable states can be retainable to ambient pressure in their application temperature range.…”

Section: Introductionmentioning

confidence: 99%

Pressure Engineering Promising Transparent Oxides with Large Conductivity Enhancement and Strong Thermal Stability

Liu

Zhang

et al. 2022

Advanced Science

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Transparent conducting oxides (TCO) with high electrical conductivity and high visible light transparency are desired for a wide range of high-impact engineering. Yet, usually, a compromise must be made between conductivity and transparency, limiting the practical application of a TCO to the next level. Furthermore, TCO performance is highly sensitive to composition, so conventional synthesis methods, such as chemical doping, cannot unravel the mysteries of the quantitative structure-performance relationship. Thus, improving the fundamental understanding or creating materials-by-design has limited success. Here, a strategy is proposed to modulate the lattice and electronic and optical properties precisely by applying pressure on a TCO. Strikingly, after compression-decompression treatment on the indium titanium oxides (ITiO), a highly transparent and metastable phase with two orders of magnitude enhancement in conductivity is synthesized from an irreversible phase transition. Moreover, this phase possesses previously unattainable filter efficiency on hazardous blue light up to 600 °C, providing potential for healthcare-related applications with strong thermal stability up to 200 °C. These results demonstrate that pressure engineering is a clean and effective tool for tailoring functional materials that are not achievable by other means, providing an exciting alternative property-tuning dimension in materials science.

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Pressure‐Induced Metallization of Lead‐Free Halide Double Perovskite (NH₄)₂PtI₆

Wang

et al. 2022

Advanced Science

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Metallization has recently garnered significant interest due to its ability to greatly facilitate chemical reactions and dramatically change the properties of materials. Materials displaying metallization under low pressure are highly desired for understanding their potential properties. In this work, the effects of the pressure on the structural and electronic properties of lead-free halide double perovskite (NH 4 ) 2 PtI 6 are investigated systematically. Remarkably, an unprecedented bandgap narrowing down to the Shockley-Queisser limit is observed at a very low pressure of 0.12 GPa, showing great promise in optoelectronic applications. More interestingly, the metallization of (NH 4 ) 2 PtI 6 is initiated at 14.2 GPa, the lowest metallization pressure ever reported in halide perovskites, which is related to the continuous increase in the overlap between the valence and conduction band of I 5p orbital. Its structural evolution upon compression before the metallic transition is also tracked, from cubic Fm-3m to tetragonal P4/mnc and then to monoclinic C2/c phase, which is mainly associated with the rotation and distortions within the [PtI 6 ] 2octahedra. These findings represent a significant step toward revealing the structure-property relationships of (NH 4 ) 2 PtI 6 , and also prove that high-pressure technique is an efficient tool to design and realize superior optoelectronic materials.

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Halide Perovskites: Suppressed Lattice Disorder for Large Emission Enhancement and Structural Robustness in Hybrid Lead Iodide Perovskite Discovered by High‐Pressure Isotope Effect (Adv. Funct. Mater. 9/2021)

Cited by 4 publications

References 0 publications

Additive Engineering in Antisolvent for Widening the Processing Window and Promoting Perovskite Seed Formation in Perovskite Solar Cells

Additive Engineering in Antisolvent for Widening the Processing Window and Promoting Perovskite Seed Formation in Perovskite Solar Cells

Pressure Engineering Promising Transparent Oxides with Large Conductivity Enhancement and Strong Thermal Stability

Pressure‐Induced Metallization of Lead‐Free Halide Double Perovskite (NH₄)₂PtI₆

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Halide Perovskites: Suppressed Lattice Disorder for Large Emission Enhancement and Structural Robustness in Hybrid Lead Iodide Perovskite Discovered by High‐Pressure Isotope Effect (Adv. Funct. Mater. 9/2021)

Cited by 4 publications

References 0 publications

Additive Engineering in Antisolvent for Widening the Processing Window and Promoting Perovskite Seed Formation in Perovskite Solar Cells

Additive Engineering in Antisolvent for Widening the Processing Window and Promoting Perovskite Seed Formation in Perovskite Solar Cells

Pressure Engineering Promising Transparent Oxides with Large Conductivity Enhancement and Strong Thermal Stability

Pressure‐Induced Metallization of Lead‐Free Halide Double Perovskite (NH4)2PtI6

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Pressure‐Induced Metallization of Lead‐Free Halide Double Perovskite (NH₄)₂PtI₆