Formation of laterally-graded Ge based hetero-structure

Ryo Matsumura, Taizoh Sadoh, Masanobu Miyao

Research output: Contribution to journalArticlepeer-review


Laterally-graded SiGe-on-insulator is the key-structure for next-generation Si-technology, which enables advanced device-arrays with various energy-band-gaps as well as 2-dimensional integration of functional-materials with various lattice-constants. Segregation kinetics in rapid-melting growth of SiGe stripes are investigated in wide ranges of stripe-lengths (10-500μm) and cooling-rates (10-19℃/s). Universal laterally-graded SiGe-profiles obeying Scheil-equation are obtained for all samples with low cooling-rate (10℃/s), which enables robust designing of lateral-SiGe-profiles. For samples with high cooling-rates and long stripe-lengths, anomalous two-step-falling profiles are obtained. Dynamical analysis considering the growth-rate-effects enables comprehensive understanding of such phenomena. This provides the unique tool to achieve modulated lateral-SiGe-profiles beyond Scheil-equation.
Original languageEnglish
Pages (from-to)17-23
Number of pages7
JournalIEICE technical report
Issue number18
Publication statusPublished - Apr 25 2013


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