Electron spin resonance investigation of ion beam modified amorphous hydrogenated (diamondlike) carbon

Journal Article · Sun Nov 15 04:00:00 EST 1987 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.339123· OSTI ID:6096009

Adel, M E; Kalish, R; Prawer, S

Electron spin resonance (ESR) measurements on diamondlike carbon films show that the as-grown material possesses a very high (2.5 x 10/sup 20/ cm/sup -3/) concentration of dangling bonds. Upon irradiation with 50-keV C/sup +/ carbon ions, the number of ESR active centers increases by a factor of 3.5 and the linewidth narrows, but no shift in the g value is observed, and the resonant peak remains Lorentzian. These effects are concomitant with the previously observed dramatic decrease in the electrical resistivity (4--5 orders of magnitude). The ESR results verify that no graphitelike islands have formed as a result of the irradiation. The likely conduction mechanism is via hopping in band tail states, the number of which increases as a result of the ion impact.

• Research Organization: Physics Department and Solid State Institute, Technion, Israel Institute of Technology, Haifa 32000, Israel
• OSTI ID: 6096009
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 62:10; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360605* -- Materials-- Radiation Effects
AMORPHOUS STATE
CARBON
CARBON IONS
CHARGED PARTICLES
CHEMICAL BONDS
ELECTRON SPIN RESONANCE
ELEMENTS
IMPURITIES
IONS
MAGNETIC RESONANCE
NONMETALS
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
RESONANCE