Transient and steady-state photoconductivity of a solid C[sub 60] film

Journal Article · Wed Sep 15 00:00:00 EDT 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.48.8506· OSTI ID:6183748

Lee, C H; Yu, G; Moses, D ^[1]; Srdanov, V I ^[2]; Wei, X; Vardeny, Z V ^[3]

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1. Institute for Polymers and Organic Solids, University of California at Santa Barbara, Santa Barbara, California 93106 (United States)
2. Center for Quantized Electronic Structures, University of California at Santa Barbara, Santa Barbara, California 93106 (United States)
3. Department of Physics, University of Utah, Salt Lake City, Utah 84112 (United States)

We report the experimental results of the subnanosecond time-resolved transient photoconductivity (PC) of solid C[sub 60] film at various photon energies, and the spectral response of the steady-state PC in the energy range between 1.5 and 4.5 eV. The initial fast transient PC response decays exponentially in the subnanosecond time regime, followed by a weak slower component. Decay time at [h bar][omega]=2.0 eV is longer than that at [h bar][omega]=2.6 and 2.9 eV. At [h bar][omega]=2.0 eV, transient PC peak shows a superlinear intensity dependence, suggesting carrier generation via exciton-exciton collision ionization, consistent with the recent results of fast photoinduced absorption. However, the linear intensity dependence of the transient PC at [h bar][omega]=2.6 and 2.9 eV and a sharp increase of the transient and steady-state PC response at [h bar][omega][approx]2.3 eV indicate direct photogeneration of free electrons and holes at [h bar][omega][gt]2.3 eV.

• DOE Contract Number: FG03-93ER45490
• OSTI ID: 6183748
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 48:11; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360606* -- Other Materials-- Physical Properties-- (1992-)
CARBON
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
ENERGY RANGE
EV RANGE
EV RANGE 01-10
EXCITONS
FILMS
FULLERENES
NONMETALS
PHOTOCONDUCTIVITY
PHYSICAL PROPERTIES
QUASI PARTICLES
STEADY-STATE CONDITIONS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
THIN FILMS
TRANSIENTS