Improved electrical properties of SiC wafer with defects covered by free standing graphene

Jun Gyu Kim, Young Hee Kim, Doo Jin Choi

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

As a single crystal SiC is grown, defects and dislocations occur due to many reasons. In particular, defects such as micropipes and micropores that are generated during the growth of single crystal SiC ingot have irregular locations and sizes. These defects continue to exist after the manufacturing process and undermine the properties of single crystal SiC wafer. Moreover, they lower the electrical properties of the wafers and can even cause detrimental damages after being applied in devices. We combined single crystal SiC wafer and graphene with a floating method in order to use graphene as a bridge to connect the SiC bonding that is broken due to defects such as micropipes and micropores in single crystal SiC wafer. In this process, we characterized the layers of graphene needed, ranging from monolayer to multilayer, to cover micropipes and micropores of various sizes. As a result of measuring the thermoelectrical conductivity of single crystal SiC wafer combined with monolayer graphene up to temperatures of 400 C, we observed electrical conductivity that was two or three orders higher than that of the SiC wafer alone. In addition, the connection between the SiC and the graphene was stable.

Original languageEnglish
Pages (from-to)55-59
Number of pages5
JournalDiamond and Related Materials
Volume43
DOIs
Publication statusPublished - 2014 Mar 1

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Graphite
Graphene
Electric properties
Single crystals
Defects
Monolayers
Ingots
Dislocations (crystals)
Multilayers

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Chemistry(all)
  • Mechanical Engineering
  • Materials Chemistry
  • Electrical and Electronic Engineering

Cite this

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abstract = "As a single crystal SiC is grown, defects and dislocations occur due to many reasons. In particular, defects such as micropipes and micropores that are generated during the growth of single crystal SiC ingot have irregular locations and sizes. These defects continue to exist after the manufacturing process and undermine the properties of single crystal SiC wafer. Moreover, they lower the electrical properties of the wafers and can even cause detrimental damages after being applied in devices. We combined single crystal SiC wafer and graphene with a floating method in order to use graphene as a bridge to connect the SiC bonding that is broken due to defects such as micropipes and micropores in single crystal SiC wafer. In this process, we characterized the layers of graphene needed, ranging from monolayer to multilayer, to cover micropipes and micropores of various sizes. As a result of measuring the thermoelectrical conductivity of single crystal SiC wafer combined with monolayer graphene up to temperatures of 400 C, we observed electrical conductivity that was two or three orders higher than that of the SiC wafer alone. In addition, the connection between the SiC and the graphene was stable.",
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Improved electrical properties of SiC wafer with defects covered by free standing graphene. / Kim, Jun Gyu; Kim, Young Hee; Choi, Doo Jin.

In: Diamond and Related Materials, Vol. 43, 01.03.2014, p. 55-59.

Research output: Contribution to journalArticle

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AU - Choi, Doo Jin

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AB - As a single crystal SiC is grown, defects and dislocations occur due to many reasons. In particular, defects such as micropipes and micropores that are generated during the growth of single crystal SiC ingot have irregular locations and sizes. These defects continue to exist after the manufacturing process and undermine the properties of single crystal SiC wafer. Moreover, they lower the electrical properties of the wafers and can even cause detrimental damages after being applied in devices. We combined single crystal SiC wafer and graphene with a floating method in order to use graphene as a bridge to connect the SiC bonding that is broken due to defects such as micropipes and micropores in single crystal SiC wafer. In this process, we characterized the layers of graphene needed, ranging from monolayer to multilayer, to cover micropipes and micropores of various sizes. As a result of measuring the thermoelectrical conductivity of single crystal SiC wafer combined with monolayer graphene up to temperatures of 400 C, we observed electrical conductivity that was two or three orders higher than that of the SiC wafer alone. In addition, the connection between the SiC and the graphene was stable.

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