Publication detail

X-ray induced electrostatic graphene doping via defect charging in gate dielectric

PROCHÁZKA, P. MAREČEK, D. LIŠKOVÁ, Z. ČECHAL, J. ŠIKOLA, T.

Original Title

X-ray induced electrostatic graphene doping via defect charging in gate dielectric

Type

journal article in Web of Science

Language

English

Original Abstract

Graphene field effect transistors are becoming an integral part of advanced devices. Hence, the advanced strategies for both characterization and tuning of graphene properties are required. Here we show that the X-ray irradiation at the zero applied gate voltage causes very strong negative doping of graphene, which is explained by X-ray radiation induced charging of defects in the gate dielectric. The induced charge can be neutralized and compensated if the graphene device is irradiated by X-rays at a negative gate voltage. Here the charge neutrality point shifts back to zero voltage. The observed phenomenon has strong implications for interpretation of X-ray based measurements of graphene devices as it renders them to significantly altered state. Our results also form a basis for remote X-ray tuning of graphene transport properties and X-ray sensors comprising the graphene/oxide interface as an active layer

Keywords

Graphene, Field effect transistor, X-rays, Charged defects, Gate dielectrics

Authors

PROCHÁZKA, P.; MAREČEK, D.; LIŠKOVÁ, Z.; ČECHAL, J.; ŠIKOLA, T.

Released

3. 4. 2017

Publisher

NPG

ISBN

2045-2322

Periodical

Scientific Reports

Year of study

7

Number

1

State

United Kingdom of Great Britain and Northern Ireland

Pages from

1

Pages to

7

Pages count

7

URL

https://www.nature.com/articles/s41598-017-00673-z

Full text in the Digital Library

http://hdl.handle.net/11012/64752

BibTex

@article{BUT134874,
  author="Pavel {Procházka} and David {Mareček} and Zuzana {Lišková} and Jan {Čechal} and Tomáš {Šikola}",
  title="X-ray induced electrostatic graphene doping via defect charging in gate dielectric",
  journal="Scientific Reports",
  year="2017",
  volume="7",
  number="1",
  pages="1--7",
  doi="10.1038/s41598-017-00673-z",
  issn="2045-2322",
  url="https://www.nature.com/articles/s41598-017-00673-z"
}