Electrical and Thermal Conductivity

Ventura, G.; Perfetti, Mauro

doi:10.1007/978-94-017-8969-1_7

Cited by 3 publications

(1 citation statement)

References 116 publications

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“…As the thermal conductivity is affected by numerous factors, much effort has been paid by many researchers to develop thermal conductivity models suitable for different systems, and to obtain a favorable function for a certain occasion is a complicated process indeed. The Al/Si composite in this work is also a kind of solid-solid binary composite system, and several widely applied theoretical and empirical models are discussed, including the Maxwell model [43,44], the EMT model [44], Chiew-Glandt model [45], the Topper model [46,47] and the Agari model [48,49]. The calculation formulae of the models are summarized in Table 2.…”

Section: Thermal Propertiesmentioning

confidence: 99%

Facile Synthesis and the Thermal Properties of Al/Si Composites Prepared via Fast Hot-Pressing Sintering

Jia,

Hei,

et al. 2023

Metals

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In this paper, a novel power sintering technique, named fast hot-pressing sintering (FHP), which is able to achieve an ultrahigh heating rate similar to the spark plasma sintering (SPS) technique, but at a much lower cost, was applied to prepare a series of Al/Si composites with different Si volume ratios (12 vol.% to 70 vol.%) to meet the requirements of advanced packaging materials for electronic devices. In contrast to SPS, the FHP oven possesses a safe and budget-friendly current power supply, rather than a complex and expensive pulse power supply, for its heating power. The optimized sintering parameters (temperature, pressure and holding time) of FHP for preparing Al/Si composites were investigated and determined as 470 °C, 300 MPa and 5 min, respectively. In order to characterize the potential of Al/Si composites as packaging materials, thermal conductivities and coefficients of thermal expansion were studied. The thermal conductivity of the Al-40Si composite sintered by the FHP method is higher than that of the conventional SPS method (139 to 107 W m−1 K−1). With the increase in Si, the thermal conductivities and coefficients of thermal expansion on both decreases. Furthermore, the thermal conductivities obey the Agari model, whereas the coefficient of thermal expansion and Si volume ratios obey additivity. The numeric modeling would help develop required packaging materials based on the thermal performances of the substrate materials, like Si or GaAs semiconductor devices.

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Section: Thermal Propertiesmentioning

confidence: 99%

Facile Synthesis and the Thermal Properties of Al/Si Composites Prepared via Fast Hot-Pressing Sintering

Jia,

Hei,

et al. 2023

Metals

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Growth of BiSBr Microsheet Arrays for Enhanced Photovoltaics Performance

Li,

Huang,

Ding

et al. 2023

Small

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In this study, single‐crystalline BiSBr is synthesized using a solution‐based approach and conducted a systematic characterization of its photoelectric properties and photovoltaic performances. UV photoelectron spectroscopy and density functional theory (DFT) calculations reveal that BiSBr is an indirect p‐type semiconductor, characterized by distinct positions and compositions of the valence band maximum and conduction band minimum. The BiSBr single crystal microrod features a significant electrical conductivity of 14 800 S m−1 along the c‐axis, denoting minimal carrier resistance in this direction. For photovoltaic performance assessment, the authors successfully fabricated two homogeneous BiSBr films on TiO2 porous substrates: A microsheet array film via physical vapor deposition (PVD) and solvothermal treatment, and a BiSBr microsheet film via PVD and thermal treatment. The solar cell, comprising a BiSBr microsheet array film with an architecture of fluorine‐doped tin oxide FTO/TiO2/BiSBr/(I3−/I−)/Pt, demonstrated a power conversation efficiency of 1.40%, ≈11 times that of BiSBr microsheet film counterpart. These preliminary results underscore the potential of BiSBr microsheet arrays, producible through low‐cost solution processes, as adept light absorbers, enhancing photovoltaic efficiency through effective light scattering and promoting efficient electron‐hole separation and transport.

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