Pore- and delamination-induced mismatch strain relaxation and conditions for the formation of dislocations, cracks, and buckles in the epitaxial AlN(0001)/SiC/Si(111) heterostructure
“…Considering the large differences in thermal expansion coefficients between the Al 2 O 3 substrate and the Ag and AlN layers, the accumulation and subsequent relaxation of thermally-induced stress gradients in the NML upon heating could promote directional Ag migration. 20,32 Namely the relaxation of thermal stresses can be easily achieved at the free surface, but not at the interface. Indeed directional (inward) migration of Ag to the NML/substrate has not been observed in the present study.…”
Section: Stress Evolution During Heating By Real-time Transmission-xrdmentioning
Phase stability and microstructural evolution of nano-multilayers (NMLs) during thermal treatments have attracted increasing attention in several technological fields.
“…Considering the large differences in thermal expansion coefficients between the Al 2 O 3 substrate and the Ag and AlN layers, the accumulation and subsequent relaxation of thermally-induced stress gradients in the NML upon heating could promote directional Ag migration. 20,32 Namely the relaxation of thermal stresses can be easily achieved at the free surface, but not at the interface. Indeed directional (inward) migration of Ag to the NML/substrate has not been observed in the present study.…”
Section: Stress Evolution During Heating By Real-time Transmission-xrdmentioning
Phase stability and microstructural evolution of nano-multilayers (NMLs) during thermal treatments have attracted increasing attention in several technological fields.
“…где ε 0 -деформация пленки SiC [6]; α -разность коэффициентов теплового расширения слоев материалов 1 и 2, T = 1280…”
Section: оценка значения напряжений несоответствияunclassified
“…Ранее авторами [6,8] экспериментально показано, что применение пористого кремния в качестве буферного слоя в гетероструктурах 3C−SiC/Si, позволяет снизить значение остаточных напряжений. Для получения выражений, описывающих остаточные напряжения в гетроструктурах 3C−SiC/por-Si необходимо ввести указанные ниже корректировки.…”
Section: оценка значения напряжений несоответствияunclassified
“…Построение эпюр напряжений при наличии буферного мезопористого слоя проводится по аналогичной схеме с помощью уравнений равновесия. Условие равновесия также описывается уравнением (6). Выражение для деформации слоя карбида кремния можно получить введением упрощенной модели пористого слоя как массива вертикальных цилиндрических пор в сплошном материале.…”
Section: оценка значения напряжений несоответствияunclassified
“…Эпитаксия карбида кремния на подложках Si с приповерхностным пористым слоем (por-Si) позволяет существенно снизить внутренние напряжения несоответствия в синтезируемых пленках [6][7][8]. Тем не менее в настоящее время в специальной научной литературе отсутствуют научные исследования процессов релаксации внутренних напряжений гетероэпитаксиальных пленок 3C−SiC буферным слоем пористого кремния.…”
The results of the work quantitatively and qualitatively illuminate the processes of relaxation of misfit stresses arising during the epitaxy of cubic silicon carbide on silicon. Analysis of stress distributions of mechanical stress in 3C-SiC / Si and 3C-SiC / por-Si heterostructures is carried out. The essential role of the porous buffer layer in reducing the magnitude of misfit stresses is shown. The theoretical study data are confirmed by the experimental values of residual stresses in 3C-SiC / Si and 3C-SiC / por-Si samples.
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