Radiation-Induced Conductivity in Amorphous Carbon

• Main Author: Jones, Todd Jarrott
• Format: Others
• Language: en
• Published: 1989
• Online Access: https://thesis.library.caltech.edu/466/5/jones-tj_1989.pdf; Jones, Todd Jarrott (1989) Radiation-Induced Conductivity in Amorphous Carbon. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/5A5K-T270. https://resolver.caltech.edu/CaltechETD:etd-02022007-131335 <https://resolver.caltech.edu/CaltechETD:etd-02022007-131335>

Amorphous carbon films were irradiated with high energy chlorine ions with energies between 1 and 45 <i>MeV</i>. The electrical conductivity was measured <i>in situ</i> 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 <i>MeV</i> irradiations show he effect of nuclear stopping associated with low energy irradiatio