کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1791333 1524467 2013 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Impact of diameter fluctuations on thermal stresses during Czochralski silicon growth
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Impact of diameter fluctuations on thermal stresses during Czochralski silicon growth
چکیده انگلیسی

Variation of crystal radius during the growth process is an inevitable feature of Czochralski crystal growth method. Fluctuation in the system i.e. heating power, pulling rate and melt level perturbs the stability of the growth process during Czochralski silicon growth. Highly uneven topographies are likely to act as concentrators for thermally induced stresses and deformations. This effect has been underestimated and neglected in stress studies and the crystal is assumed perfectly cylindrical. A set of 2D simulation were performed for an axisymmetric crystal with isotropic properties. The crystal boundary is perturbed complying a sinusoidal function. The impact of amplitude and frequency of crystal radius fluctuation on stress field inside the crystal has been studied. Simulation result shows that crystal surface undulation affects both thermal field and stress distribution inside the crystal. Sharp angels and profound perturbation found to generate high stresses at the crystal periphery.


► The impact of Cz–Si crystal diameter fluctuation on stress field is studied.
► A sinusoidal function is adopted for the crystal side boundary.
► These undulations influence the thermal and stress fields inside the crystal.
► Fine tuning of crystal diameter is found favorable in terms of stresses.
► Lower wavelengths and larger amplitudes result in several local maxima.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Crystal Growth - Volume 362, 1 January 2013, Pages 312–318
نویسندگان
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