Graphene transistors on SiO 2 /Si were irradiated with 5, 10, and 15 MeV protons at a dose rate of 2 × 10 14 cm -2 . The effect of proton irradiation on the structural defects and electrical characteristics of graphene was measured using Raman spectroscopy and electrical measurements. Raman spectra exhibited high intensity peaks induced by defects after 5 and 10 MeV proton irradiation, whereas no significant defect-induced peaks were observed after 15 MeV proton irradiation. The drain current of graphene transistors decreased and the Dirac point shifted after proton irradiation; however, a flattening in the Dirac point occurred after 15 MeV proton irradiation. The variations in characteristics were attributed to different types of graphene defects, which were closely related to the irradiation energy dependency of the transferred energy. Our observation results were in good agreement with the Bethe formula as well as the stopping and range of ions in matter simulation results.
Bibliographical noteFunding Information:
This work was supported by the Korea Aerospace Research Institute (KARI)-University partnership program and by the Priority Research Centers Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology ( 2012-0006689 ). This research was also supported in part by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MEST) (No. 2011-0028594 ) and by the IT R&D program of MOTIE/KEIT [ 10040052 , Development of X-ray Detector Sensor and ROIC on Photon Counting Method for 16bit High Resolution Dynamic Image Processing]. This work was also supported by the Industrial Strategic Technology Development program (10041041, Development of Non-vacuum and Non-lithography Based 5 μm Width Cu Interconnect Technology for TFT Backplane) funded by the Ministry of Knowledge Economy (MKE, Korea).
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All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Physics and Astronomy(all)
- Surfaces and Interfaces
- Surfaces, Coatings and Films