Determination of conduction parameters of vacuum deposited magnesium phthalocyanine thin films from their electrical, optical studies and application of VRH model

Rajesh, K.; Menon, C. S.

doi:10.1016/j.jnoncrysol.2005.07.001

Cited by 13 publications

(5 citation statements)

References 28 publications

(24 reference statements)

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“…A linear J-V characteristic at low voltages followed by nonlinear V dependences at higher voltages was claimed in many cases. [3][4][5][6][7] Generally, the current density in the linear ("Ohmic") regime was expected to be given as J = nμqV /L, although an explicit length or thickness dependence experimental study is usually lacking. Many other studies investigate only the high-voltage dependence, overlooking altogether the low-voltage regime.…”

Section: Introductionmentioning

confidence: 99%

“…[8][9][10][11][12] The temperature dependence of the current in the Ohmic regime is usually characterized using Arrhenius plots, in which the slopes of the linear regions give the activation energies for hopping transport. 5,7,13 All these studies are generally characterized by a lack of comprehensive experimental investigations in a wide parameter range, and a complete theory that can simultaneously and correctly describe the voltage, thickness, and temperature dependence of the current.…”

Section: Introductionmentioning

confidence: 99%

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Exponential behavior of the Ohmic transport in organic films

et al. 2011

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An exponential dependence of conductance on thickness and temperature was found in the low-voltage, Ohmic regime of copper (CuPc) and cobalt (CoPc) phthalocyanine, sandwiched between palladium and gold electrodes unlike ever claimed in organic materials. To assure cleanliness and integrity of the electrode-phthalocyanine interface, the devices were prepared in situ, using organic molecular beam deposition with a floating shadow mask. The dc transport measurements in a wide temperature and thickness range show that (i) the low-voltage J-V curve is linear, with current increasing sharply at higher voltages, (ii) the low-voltage conductance increases exponentially with temperature, and (iii) it decreases exponentially with film thickness. A comparison with conventional models fails to explain all the data with a single set of parameters. On the other hand, a model outlined here, which incorporates tunneling between localized states with thermally induced overlap, agrees with the data and decouples the contributions to conductance from the electrode-film interface and the bulk of the film.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Exponential behavior of the Ohmic transport in organic films

et al. 2011

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“…From these studies we can measure the parameters like the density of states at Fermi level N(E F ), and the hopping distance (R). The conduction mechanism at low temperature region can be expressed as [22].…”

Section: Electrical Conductivity Studiesmentioning

confidence: 99%

Low temperature effects on electrical and optical properties of TTBNc thin films

Dhanya

Gopinathan

Panicker

et al. 2010

Journal of Non-Crystalline Solids

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“…Thermally generated hole concentration, hole mobility, total trap concentration and depth of the trap level are estimated. In organic compound samples that are not macroscopic single crystals conduction can be dominated by variable-range-hopping (VRH) [25]. We have applied the VRH model to this sample in the low temperature region, and hopping conduction parameters are determined for different samples.…”

Section: Introductionmentioning

confidence: 99%