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预注入对Si_(1-x)C_x合金形成的影响
Authors
孙国胜
李晋闽
+4 more
林兰英
王引书
王玉田
王衍斌
Publication date
1 January 2001
Publisher
Abstract
室温下在单晶Si中注入(0.6-1.5)at%的C原子,部分样品在C离子注入之前在其中注入~(29)Si~+离子产生损伤,然后在相同条件下利用高温退火固相外延了Si_(1-x)C_x合金,研究了预注入对Si_(1-x)C_x合金形成的影响。如果注入C离子的剂量小于引起Si非晶化的剂量,在950℃退火过程中注入产生的损伤缺陷容易与C原子结合形成缺陷团簇,难于形成Si_(1-x)C_x合金,预注入形成的损伤有利于合金的形成。随着C离子剂量的增大,注入产生的损伤增强,预注入反而不利于Si_(1-x)C_x合金的形成,但当注入C原子的浓度超过固相外延的溶解度时,预注入的影响可以忽略。退火温度升高到1050℃,无论预注入还是未预注入样品,C含量低的合金相仍然保留,而C含量高的合金相大部分消失
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Last time updated on 15/03/2019