Phonon dynamic behaviors induced by amorphous layers at heterointerfaces

Wang, Quanjie; Zhang, Jie; Xiong, Yucheng; Li, Shouhang; Chernysh, Vladimir; Liu, Xiangjun

doi:10.1039/d3cp04480g

Phys. Chem. Chem. Phys.

2024

DOI: 10.1039/d3cp04480g

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Phonon dynamic behaviors induced by amorphous layers at heterointerfaces

Quanjie Wang,

Jie Zhang,

Yucheng Xiong

et al.

Abstract: An amorphous layer is commonly found at the interfaces of heterostructures due to lattice and thermal mismatch between dissimilar materials. While existing research has explored the impact of these layers...

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Cited by 2 publications

References 66 publications

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Europium Oxide Evoked Multisite Synergism to Facilitate Water Dissociation for Alkaline Hydrogen Evolution

Zhu,

Wu,

et al. 2024

Adv Funct Materials

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Exploring an efficient nonnoble metal catalyst for hydrogen evolution reaction (HER) is critical for industrial alkaline water electrolysis. However, it remains a great challenge due to the additional energy required for H─OH bond cleavage and the lack of enough H2O adsorption sites for most catalysts. Herein, the integration of oxophilic Eu2O3 with NiCo alloy with evoked multisite synergism to facilitate water dissociation for alkaline HER is proposed. The optimized Eu2O3‐NiCo exhibits excellent HER activity with a low overpotential of only 60 mV at 10 mA cm−2 and good electrochemical stability, which is superior to that of Eu2O3‐free NiCo and comparable to benchmark Pt/C. The key roles of Eu2O3 on the enhanced HER performance of Eu2O3‐NiCo are identified by in situ Raman spectroscopy and theoretical calculations. It is discovered that the Eu2O3 with strong oxophilicity facilitates the adsorption of H2O and the breakage of H─OH bonding while evoking the electron redistribution at Eu2O3/NiCo interface and accelerating the Volmer step in alkaline HER. Furthermore, the obtained Eu2O3‐NiCo as both anode and cathode displays excellent overall water‐splitting activity and stability in 1.0 M KOH solution. It is believed that this study provides an important inspiration to design high‐performance electrocatalysts toward HER based on rare‐earth materials.

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Europium Oxide Evoked Multisite Synergism to Facilitate Water Dissociation for Alkaline Hydrogen Evolution

Zhu,

Wu,

et al. 2024

Adv Funct Materials

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High‐Efficiency Flexible GaAs/InGaAs Dual‐Junction Solar Cells Fabricated by Metallic Nanoparticle‐Based Wafer Bonding

Kim,

Park,

Nguyen

et al. 2024

Small Structures

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Multijunction solar cells made from highly lattice‐mismatched (LMM) material systems offer an optimal bandgap combination for the ultrahigh conversion of solar energy to electricity. Conventional fabrication techniques for multijunction cells, such as metamorphic epitaxy, direct wafer bonding, and adhesive wafer bonding, are still expensive and produce low yields owing to the use of complex process steps and sophisticated equipment. Herein, flexible GaAs/In0.53Ga0.47As dual‐junction solar cells with a large lattice mismatch of 3.7% between the subcells are fabricated using an indium‐tin‐oxide (ITO) nanoparticle‐based wafer bonding process. The ITO bonding layer electrically and optically connecting the GaAs top and InGaAs bottom cells shows a low series resistance of 5.7 × 10−2 Ω cm−2 and a high optical transmission of 90% in the infrared range of 870–1800 nm. The dark current characteristic of the ITO‐bonded dual‐junction cell exhibits a good rectifying behavior with a high on–off ratio of ≈105 at ±2 V. Under 1 sun AM 1.5G illumination, a high power conversion efficiency of 28.5% is achieved for the two‐terminal series‐connected dual‐junction cell, with an average external radiative efficiency of 2.6%. In these findings, it is suggested that ITO nanoparticle‐based wafer bonding may be a facile and cost‐effective route for fabricating LMM solar cells, potentially overcoming the Shockley–Queisser efficiency limit.

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Phonon dynamic behaviors induced by amorphous layers at heterointerfaces

Abstract: An amorphous layer is commonly found at the interfaces of heterostructures due to lattice and thermal mismatch between dissimilar materials. While existing research has explored the impact of these layers...

Cited by 2 publications

References 66 publications

Europium Oxide Evoked Multisite Synergism to Facilitate Water Dissociation for Alkaline Hydrogen Evolution

Europium Oxide Evoked Multisite Synergism to Facilitate Water Dissociation for Alkaline Hydrogen Evolution

High‐Efficiency Flexible GaAs/InGaAs Dual‐Junction Solar Cells Fabricated by Metallic Nanoparticle‐Based Wafer Bonding

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