Atomic layer deposition of HfO2 on graphene through controlled ion beam treatment

Ki Seok Kim, Il Kwon Oh, Hanearl Jung, Hyungjun Kim, Geun Young Yeom, Kyong Nam Kim

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The polymer residue generated during the graphene transfer process to the substrate tends to cause problems (e.g., a decrease in electron mobility, unwanted doping, and non-uniform deposition of the dielectric material). In this study, by using a controllable low-energy Ar+ ion beam, we cleaned the polymer residue without damaging the graphene network. HfO2 grown by atomic layer deposition on graphene cleaned using an Ar+ ion beam showed a dense uniform structure, whereas that grown on the transferred graphene (before Ar+ ion cleaning) showed a non-uniform structure. A graphene-HfO2-metal capacitor fabricated by growing 20-nm thick HfO2 on graphene exhibited a very low leakage current (<10-11 A/cm2) for Ar+ ion-cleaned graphene, whereas a similar capacitor grown using the transferred graphene showed high leakage current.

Original languageEnglish
Article number213102
JournalApplied Physics Letters
Volume108
Issue number21
DOIs
Publication statusPublished - 2016 May 23

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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