Berlin 2018 – scientific programme

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DS: Fachverband Dünne Schichten

DS 17: Poster Session I

DS 17.28: Poster

Tuesday, March 13, 2018, 18:15–20:15, Poster B

Reduction and annihilation of wrinkles in graphene by He⁺ ion bombardment at elevated temperatures — •Alexander Herman, Philipp Valerius, and Thomas Michely — II. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany

Due to thermal mismatch of substrate and graphene, wrinkles form in CVD grown graphene upon cooling from the growth temperature to ambient. Wrinkles typically form a network with a characteristic lateral scale of micrometers. Wrinkles affect graphene’s electrical and thermal properties through scattering processes in an unfavorable way. Therefore, methods to avoid wrinkle formation or to eliminate wrinkles are highly desirable.

Using a high CVD growth temperature of 1400^∘C for graphene on Ir(111) we force a large amount of wrinkles to result in the absence of any additional treatment. By additional low fluence, low energy noble gas ion irradiation at temperatures around the CVD growth temperature we show through scanning tunneling microscopy, that the height and length of the resulting wrinkles can be reduced until they are eventually completely eliminated. However, as side effects blisters and small vacancy clusters pinned to the moiré of graphene with Ir(111) show up.