Radiation-Induced Conductivity in Amorphous Carbon

Author: Jones, Todd Jarrott

Year: 1989

Degree: Dissertation (Ph.D.)

Advisor: Tombrello, Thomas A.

Committee Members: Tombrello, Thomas A.; Fultz, Brent T.; Housley, Robert M.; Johnson, William Lewis; Yariv, Amnon

Option: Applied Physics

DOI: 10.7907/5A5K-T270

Abstract

Amorphous carbon films were irradiated with high energy chlorine ions with energies between 1 and 45 MeV. The electrical conductivity was measured in situ over a range of doses from 2 x 10¹⁰ to 5 x 10¹⁵ ions/cm². It was found that the conductivity increases over three to four orders of magnitude. The variation of the conductivity with temperature is successfully fitted by a Mott hopping conduction model. The energy sensitivity of the effect (excitation curve) does not parallel the electronic stopping power of chlorine in carbon, but a multihit δ electron theory based on an ion-track model closely matches the excitation curve. The 1 and 2 MeV irradiations show he effect of nuclear stopping associated with low energy irradiatio

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