Study of the charge carrier transport through a metal-poly(arylenephthalide)-class polymer interface

The influence of the chemical structure of the poly(arylenephthalide)-class polymers on the charge carrier transport through a metal/polymer interface has been discussed. On the basis of the results obtained by physical and optical methods and quantum chemical modeling, the conclusion is made that a change in the skeleton part of the polymer molecule leads to a substantial change in the value of the potential barrier.     

Recombination luminescence of poly(arylene phthalide) films: 1. Electronic and optical features of poly(arylene phthalide)s

Features of the luminescence and absorption spectra of poly(biphenylene phthalide), poly(fluorenylene phthalide), and poly(terphenylene phthalide) films were analyzed. Experimental results obtained for these films by optical methods and thermally stimulated current spectroscopy were compared. Long-lasting afterglow emission from the films after photoexcitation was observed. Possible explanations for the observed optical and thermally stimulated processes in the poly(arylene phthalide)s were suggested in terms of reversible electronic phase transitions induced by external factors in unconjugated polymers.     

Modulation of optical absorption in poly(diphenylenephthalide) films near the switching threshold

Optical properties of poly(diphenylenephthalide) nonconjugated polymer films near the electronic switching threshold have been studied by modulation spectroscopy. The measured spectra exhibit specific features in the range of the band gap at ∼2.4 eV. The results obtained have been interpreted using quantum-chemical calculations of the electron energy characteristics of the polymer molecule. It has been established that the injection of charge carriers into the polymer film and interaction of this excess charge with the macromolecule can lead to the formation of deep trap states near the center of the band gap.     

The use of a metal-insulator-metal system for the study of structural transitions in metals

The conductivity of a low-melting metal-polymer-metal system as a function of temperature is studied. A new technique for detecting structural modifications in metals is suggested. Experimental results are discussed within a model of charge instability, which occurs in thin polymer films when boundary conditions are changed.     

Electroluminescence in unconjugated polymers based on poly(arylene phthalide) films

We discuss the results of measurements of the optical characteristics of thin organic films of unconjugated poly(arylene ether ketone) polymer. We have observed persistent electroluminescence for this polymer. We have established an interrelationship between the polarity of the voltage applied to the experimental structure and the electroluminescence spectrum. Translated from Teoreticheskaya i éksperimental’naya Khimiya, Vol. 45, No. 1, pp. 42–45, January–February, 2009.     

Electron energy distributions in a metal-polymer-vacuum system

The energy distributions of electrons emitted from a metal coated with a polymer (polydiphenylene phthalide) is studied experimentally using field electron spectroscopy. A considerable decrease in the electron work function for the metal-polymer-vacuum system as compared to pure metal is observed. Analysis of the energy distributions of emitted electrons shows that the distribution in the case with the polymer is broader and displaced towards low energies, and its high-energy edge is slightly extended. The effect of emission voltage on the shape of the energy distribution of emitted electrons is studied. A model is proposed to explain the substantial decrease in the effective electron work function in the case when the metal electrode is coated with a polymer film.     

Electrophysical Properties along the Interface of Two Polymer Films of Polymethylmethacrylate

Physics of the Solid State - The electrical conductivity is studied along the interface between dielectric films of submicrometer thicknesses. The results of the comparative study of the...     

Influence of the electrode material in a metal-polymer-metal structure on the temperature dependence of the thermally stimulated current

The dependences of the thermally stimulated current in metal-polymer-metal structures with electrodes prepared from different materials are investigated. Poly(diphenylenephthalide) films are used as a polymer. The possible contribution of the injection component to the thermally stimulated current spectrum is considered. The injection conditions are changed by replacing the electrode material. It is established that the change in the material does not lead to a change in a qualitative behavior of the temperature dependence of the current. However, the use of copper as the electrode material gives rise to an additional injection component in the thermally stimulated current spectrum and (under specific conditions) electronic switching of the sample from an insulating state to a highly conducting state. The charge is injected into deep localized electronic states that lie near the middle of the band gap of the polymer. Original Russian Text ? A.N. Lachinov, A.V. Moshelev, A.F. Ponomarev, 2009, published in Fizika Tverdogo Tela, 2009, Vol. 51, No. 3, pp. 590–595.