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Lattice Dynamics and Thermoelectric Properties of Nanocrystalline Silicon-germanium Alloys

2015
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Release : 2015
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Book Synopsis Lattice Dynamics and Thermoelectric Properties of Nanocrystalline Silicon-germanium Alloys by :

Download or read book Lattice Dynamics and Thermoelectric Properties of Nanocrystalline Silicon-germanium Alloys written by . This book was released on 2015. Available in PDF, EPUB and Kindle. Book excerpt: The lattice dynamics and thermoelectric properties of sintered phosphorus-doped nanostructured silicon- germanium alloys obtained by gas-phase synthesis were studied. Measurements of the density of phonon states by inelastic neutron scattering were combined with measurements of the elastic constants and the low- temperature heat capacity. A strong influence of nanostructuring and alloying on the lattice dynamics was observed. The thermoelectric transport properties of samples with different doping as well as samples sintered at different temperature were characterized between room temperature and 1000C. A peak figure of merit zT = 0:88 at 900C is observed and comparatively insensitive to the aforementioned param- eter variations.

Nanocrystalline Silicon

2014
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Release : 2014
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Book Synopsis Nanocrystalline Silicon by :

Download or read book Nanocrystalline Silicon written by . This book was released on 2014. Available in PDF, EPUB and Kindle. Book excerpt: Silicon has several advantages when compared to other thermoelectric materials, but until recently it was not used for thermoelectric applications due to its high thermal conductivity, 156 W K-1 m-1 at room temperature. Nanostructuration as means to decrease thermal transport through enhanced phonon scattering has been a subject of many studies. In this work we have evaluated the effects of nanostructuration on the lattice dynamics of bulk nanocrystalline doped silicon. The samples were prepared by gas phase synthesis, followed by current and pressure assisted sintering. The heat capacity, density of phonons states, and elastic constants were measured, which all reveal a significant, ≈25%, reduction in the speed of sound. The samples present a significantly decreased lattice thermal conductivity, ≈25 W K-1 m-1, which, combined with a very high carrier mobility, results in a dimensionless figure of merit with a competitive value that peaks at ZT ≈ 0.57 at 973 °C. Due to its easily scalable and extremely low-cost production process, nanocrystalline Si prepared by gas phase synthesis followed by sintering could become the material of choice for high temperature thermoelectric generators.

Silicon, Germanium, and Their Alloys

2014-12-09 Science
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Release : 2014-12-09
Genre : Science
Kind : eBook
Book Rating : 656/5 ( reviews)

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Book Synopsis Silicon, Germanium, and Their Alloys by : Gudrun Kissinger

Download or read book Silicon, Germanium, and Their Alloys written by Gudrun Kissinger. This book was released on 2014-12-09. Available in PDF, EPUB and Kindle. Book excerpt: Despite the vast knowledge accumulated on silicon, germanium, and their alloys, these materials still demand research, eminently in view of the improvement of knowledge on silicon-germanium alloys and the potentialities of silicon as a substrate for high-efficiency solar cells and for compound semiconductors and the ongoing development of nanodevic

Thermoelectric Energy Conversion

2017-08-22 Technology & Engineering
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Release : 2017-08-22
Genre : Technology & Engineering
Kind : eBook
Book Rating : 132/5 ( reviews)

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Book Synopsis Thermoelectric Energy Conversion by : Diana Davila Pineda

Download or read book Thermoelectric Energy Conversion written by Diana Davila Pineda. This book was released on 2017-08-22. Available in PDF, EPUB and Kindle. Book excerpt: The latest volume in the well-established AMN series, this ready reference provides an up-to-date, self-contained summary of recent developments in the technologies and systems for thermoelectricity. Following an initial chapter that introduces the fundamentals and principles of thermoelectricity, subsequent chapters discuss the synthesis and integration of various bulk thermoelectric as well as nanostructured materials. The book then goes on to discuss characterization techniques, including various light and mechanic microscopy techniques, while also summarizing applications for thermoelectric materials, such as micro- and nano-thermoelectric generators, wearable electronics and energy conversion devices. The result is a bridge between industry and scientific researchers seeking to develop thermoelectric generators.

Silicon-Germanium Carbon Alloys

2002-07-26 Technology & Engineering
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Release : 2002-07-26
Genre : Technology & Engineering
Kind : eBook
Book Rating : 633/5 ( reviews)

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Book Synopsis Silicon-Germanium Carbon Alloys by : S. Pantellides

Download or read book Silicon-Germanium Carbon Alloys written by S. Pantellides. This book was released on 2002-07-26. Available in PDF, EPUB and Kindle. Book excerpt: Carbon (C) and Silicon Germanium (SiGe) work like a magic sauce. At least in small concentrations, they make everything taste better. It is remarkable enough that SiGe, a new material, and the heterobipolar transistor, a new device, appear on the brink of impacting the exploding wireless market. The addition of C to SiGe, albeit in small concentrations, looks to have breakthrough potential. Here, at last, is proof that materials science can put a rocket booster on the silicon-mind, the silicon transistor. Scientific excitement arises, as always, from the new possibilities a multicomponent materials system offers. Bandgaps can be changed, strains can be tuned, and properties can be tailored. This is catnip to the materials scientist. The wide array of techniques applied here to the SiGeC system bear testimony to the ingenious approaches now available for mastering the complexities of new materials

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