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SiGe ( or ), or silicon-germanium, is an alloy with any molar ratio of silicon and germanium, i.e. with a molecular formula of the form Si1−''x''Ge''x''. It is commonly used as a semiconductor material in integrated circuits (ICs) for heterojunction bipolar transistors or as a strain-inducing layer for CMOS transistors. IBM introduced the technology into mainstream manufacturing in 1989.〔Ouellette, Jennifer (June/July 2002). ("Silicon–Germanium Gives Semiconductors the Edge" ), ''The Industrial Physicist''.〕 This relatively new technology offers opportunities in mixed-signal circuit and analog circuit IC design and manufacture. == Production == The use of silicon-germanium as a semiconductor was championed by Bernie Meyerson. SiGe is manufactured on silicon wafers using conventional silicon processing toolsets. SiGe processes achieve costs similar to those of silicon CMOS manufacturing and are lower than those of other heterojunction technologies such as gallium arsenide. Recently, organogermanium precursors (e.g. isobutylgermane, alkylgermanium trichlorides, and dimethylaminogermanium trichloride) have been examined as less hazardous liquid alternatives to germane for MOVPE deposition of Ge-containing films such as high purity Ge, SiGe, and strained silicon. SiGe foundry services are offered by several semiconductor technology companies. AMD disclosed a joint development with IBM for a SiGe stressed-silicon technology,〔(AMD And IBM Unveil New, Higher Performance, More Power Efficient 65nm Process Technologies At Gathering Of Industry’s Top R&D Firms ) retrieved at March 16, 2007〕 targeting the 65-nm process. TSMC also sells SiGe manufacturing capacity. In July 2015, IBM announced that it had created working samples of transistors using a 7 nm silicon-germanium process, promising a quadrupling in the amount of transistors compared to a contemporary process.〔(IBM Discloses Working Version of a Much Higher-Capacity Chip - NYTimes.com )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Silicon-germanium」の詳細全文を読む スポンサード リンク
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