Optical and electrical properties of ion-beam-irradiated films of organic molecular solids and polymers

Journal Article · Wed Feb 01 04:00:00 EST 1984 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.333131· OSTI ID:5268160

Kaplan, M L; Forrest, S R; Schmidt, P H; Venkatesan, T

Thin films of several nonpolymeric and polymeric organic compounds become optically dark and electrically conducting on irradiation with energetic particle beams. Using 2-MeV Ar/sup +/ ion beam irradiation, we have generated conducting patterns in otherwise high-resistivity, organic thin films among which are 3, 4, 9, 10-perylenetetracarboxylic dianhydride, 1, 4, 5, 8-napthalenetetracarboxylic dianhydride, and Ni phthalocyanine. The room-temperature resistivity of the films changes by 14 orders of magnitude from its as-deposited value of rho>10/sup 10/ ..cap omega.. cm to rho = 5 x 10/sup -4/ ..cap omega.. cm at ion doses of 10/sup 17/ cm/sup -2/. The temperature (T) dependence of the resistivity follows rho(T)proportionalexp(+(T/sub 0//T)/sup 1/2/ ) over a wide range of dose and temperature. The characteristic temperature T/sub 0/ is found to be a function of dose. The observed behavior of rho(T) is consistent with charge transport due to hopping between isolated, conducting islands. The dependence on ion energy, ion species, and ion dose rate has been examined. The effectiveness of an ionic species in increasing a film conductivity increases with electronic energy loss of the ion in the film. Compound specific sensitivity towards ion irradiation was demonstrated. Nonlinear effects of ion dose rate were also observed. The final carbon-rich product has some characteristics similar to those of amorphous carbon; however, the conductivity is higher and the electrical behavior is different.

• Research Organization: Bell Laboratories, Murray Hill, New Jersey 07974
• OSTI ID: 5268160
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 55:3; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360406 -- Materials-- Polymers & Plastics-- Radiation Effects-- (-1987)
360605 -- Materials-- Radiation Effects
640301* -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ARGON IONS
CHARGED PARTICLES
CHARGED-PARTICLE TRANSPORT
COLLISIONS
DOSE RATES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY RANGE
FILMS
ION COLLISIONS
IONS
LIGHT TRANSMISSION
MEV RANGE
MEV RANGE 01-10
OPACITY
OPTICAL PROPERTIES
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
PHYSICAL RADIATION EFFECTS
POLYMERS
RADIATION EFFECTS
RADIATION TRANSPORT
REFLECTIVITY
SURFACE PROPERTIES
TEMPERATURE EFFECTS
THIN FILMS