Interface Breakdown in Heavily Doped Germanium Single Crystals Grown from the Melt

Vidal, Julien; Romero, R.

doi:10.1002/crat.2170160718

Cited by 3 publications

(1 citation statement)

References 18 publications

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“…this type of formation and will be discussed further below. The patterning observed in the r 1 size class follows the <110>-type growth direction and the (111)-type planar alignment as has been observed in solutes in Ge growth studies [70,71] and also by others in CZT growths [72][73][74][75]. Indeed, this cellular distribution is the hallmark signature of constitutional supercooling.…”

Section: Spatial Organization Of Particles and Observable Networksupporting

confidence: 70%

Property Improvement in CZT via Modeling and Processing Innovations . Te-particles in vertical gradient freeze CZT: Size and Spatial Distributions and Constitutional Supercooling

Henager

Alvine

Bliss

et al. 2014

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A section of a vertical gradient freeze CZT boule approximately 2100-mm 3 with a planar area of 300mm 2 was prepared and examined using transmitted IR microscopy at various magnifications to determine the three-dimensional spatial and size distributions of Te-particles over large longitudinal and radial length scales. The boule section was approximately 50-mm wide by 60-mm in length by 7-mm thick and was doubly polished for TIR work. Te-particles were imaged through the thickness using extended focal imaging to locate the particles in thickness planes spaced 15-µm apart and then in plane of the image using xy-coordinates of the particle center of mass so that a true three dimensional particle map was assembled for a 1-mm by 45-mm longitudinal strip and for a 1-mm by 50-mm radial strip. Te-particle density distributions were determined as a function of longitudinal and radial positions in these strips, and treating the particles as vertices of a network created a 3D image of the particle spatial distribution. Teparticles exhibited a multi-modal log-normal size density distribution that indicated a slight preference for increasing size with longitudinal growth time, while showing a pronounced cellular network structure throughout the boule that can be correlated to dislocation network sizes in CZT. Higher magnification images revealed a typical Rayleigh-instability pearl string morphology with large and small satellite droplets. This study includes solidification experiments in small crucibles of 30:70 mixtures of Cd:Te to reduce the melting point below 1273 K (1000˚C). These solidification experiments were performed over a wide range of cooling rates and clearly demonstrated a growth instability with Te-particle capture that is suggested to be responsible for one of the peaks in the size distribution using size discrimination visualization. The results are discussed with regard to a manifold Te-particle genesis history as 1) Teparticle direct capture from melt-solid growth instabilities, 2) Te-particle formation from dislocation core diffusion and the formation and breakup of Te-tubes, and 3) Te-particle formation due to classical nucleation and growth as precipitates. Fourier transform (averaged) of the spatial arrangement of the data. The 1D arrangement of peaks in the Fourier transform indicate a horizontal spacing of approximately 145 microns. Figure 20. An image manipulated to show the large r 3 Te-particles bonded to the nearest r 1 Te-particles using stick bonds out to 250 µm. The closest r 1 to r 3 distance in this volume element is 18 µm.

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Section: Spatial Organization Of Particles and Observable Networksupporting

confidence: 70%

Property Improvement in CZT via Modeling and Processing Innovations . Te-particles in vertical gradient freeze CZT: Size and Spatial Distributions and Constitutional Supercooling

Henager

Alvine

Bliss

et al. 2014

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The physics of Czochralski crystal growth

Uelhoff

1987

Festkörperprobleme 27

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The geometric configuration of the atoms in the surface of a solid is correlated with their valence electronic properties and thereby also with their chemical reactivity towards molecules interacting from the gas phase. Several aspects of these interactions are briefly reviewed: The atomic structure of clean single crystal surfaces and their changes by bond formation (chemisorption), the formation of chemisorbed phases with long-range order and associated phase transitions, the dynamics of the gas-surface interaction processes, as well as temporal oscillations in a catalytic reaction coupled to periodic structural transformations of a surface.

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The Influence of Constitutional Supercooling on the Distribution of Te-Particles in Melt-Grown CZT

Henager¹,

Alvine²,

Bliss³

et al. 2015

Journal of Elec Materi

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Interface Breakdown in Heavily Doped Germanium Single Crystals Grown from the Melt

Cited by 3 publications

References 18 publications

Property Improvement in CZT via Modeling and Processing Innovations . Te-particles in vertical gradient freeze CZT: Size and Spatial Distributions and Constitutional Supercooling

Property Improvement in CZT via Modeling and Processing Innovations . Te-particles in vertical gradient freeze CZT: Size and Spatial Distributions and Constitutional Supercooling

The physics of Czochralski crystal growth

The Influence of Constitutional Supercooling on the Distribution of Te-Particles in Melt-Grown CZT

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