Study of surface exfoliation on 6H-SiC induced by H₂⁺ implantation

详细信息    查看全文

• 作者：L. Zhang^a ; B.S. Li^b ; ^{b.s.li@impcas.ac.cn}
• 关键词：Smart-cut ; H2+ implantation ; Transmission electron microscopy ; Exfoliation ; Blisters
• 刊名：Physica B: Condensed Matter
• 出版年：2017
• 出版时间：1 March 2017
• 年：2017
• 卷：508
• 期：Complete
• 页码：104-111
• 全文大小：3197 K
• 卷排序：508

文摘

The effect of lattice damage generated by the H2+-implantation on exfoliation efficiency in 6H-SiC wafers is investigated. <0001> 6H-SiC wafers were implanted with 134 keV H2+ ions to ion fluences from 1.5×1016 to 5×1016 H2+ cm−2 and subsequently annealed at temperatures from 973 K to 1373 K. The samples were studied by a combination of optical microscopy and transmission electron microscopy. Only after 1373 K annealing for 15 min, blisters and exfoliation occur on the H2+-implanted sample surface. With increasing the implantation fluences from 1.5×1016 to 3.75×1016 H2+ cm−2, the exfoliation mean size decreases, while the exfoliation density increases. For the highest fluence of 5×1016 H2+ cm−2, seldom exfoliations occur on the sample surface. Microstructure analysis shows that exfoliation efficiency is largely controlled by the H2+-implantation-induced lattice damage. The depth of the microcrack is related to the implantation fluence. The effect of implantation fluence on dislocation loops, platelet nucleation and growth is investigated.