Effect of substrate preconditioning on charge transport at the phthalocyanine–conducting polymer film interface
TL;DR: In this article, the I -V characteristics of multilayer structures having vacuum deposited copper phthalocyanine on conducting polypyrrole films have been studied and the Schottky effect was obtained in others depending on the crystalline nature/morphology of the phthalocheyanine films which was affected by substrate preconditioning prior to film deposition.
About: This article is published in Thin Solid Films.The article was published on 1999-06-22. It has received 7 citations till now. The article focuses on the topics: Phthalocyanine & Polypyrrole.
Citations
More filters
TL;DR: In this article, the structure development and crystallization behavior of polypropylene (PP) containing nanoparticles of calcium phosphate prepared by a new route based on matrix mediated control of growth and morphology was investigated by X-ray diffraction (XRD), optical microscopy and DSC techniques.
195 citations
TL;DR: It was found that the admixture of PVB iso-propanol solution to the scrap of glass mirrors during milling provided stabilization of the properties of the composites produced.
30 citations
TL;DR: In this article, a new technique based on matrix mediated control of growth and morphology using polymer blends was used to obtain nanosize particles of calcium phosphate. But their crystal structure and size were confirmed by X-ray diffraction and electron microscopy.
20 citations
TL;DR: In this paper, the optical properties of titanylphthalocyanine (TiOPc) thin film fabricated by physical jet deposition technique were investigated by using absorption, femtosecond optical Kerr effect (OKE) and fs pump-probe techniques.
16 citations
References
More filters
TL;DR: In this article, a formula for the electric tunnel effect through a potential barrier of arbitrary shape existing in a thin insulating film was derived for a rectangular barrier with and without image forces, where the true image potential was considered and compared to the approximate parabolic solution derived by Holm and Kirschstein.
Abstract: A formula is derived for the electric tunnel effect through a potential barrier of arbitrary shape existing in a thin insulating film. The formula is applied to a rectangular barrier with and without image forces. In the image force problem, the true image potential is considered and compared to the approximate parabolic solution derived by Holm and Kirschstein. The anomalies associated with Holm's expression for the intermediate voltage characteristic are resolved. The effect of the dielectric constant of the insulating film is discussed in detail, and it is shown that this constant affects the temperature dependence of the J‐V characteristic of a tunnel junction.
3,727 citations
TL;DR: In this article, a stable organic electroluminescent devices based on vapor-deposited Alq thin films have been achieved, which are derived from several factors including: (1) a multilayer thin-film structure with a CuPc stabilized hole-injection contact, (2) a hole-transport diamine layer using a naphthyl substituted benzidine derivative, and (3) an ac drive wave form.
Abstract: Highly stable organic electroluminescent devices based on vapor‐deposited Alq thin films have been achieved. The improvement in stability is derived from several factors including: (1) a multilayer thin‐film structure with a CuPc stabilized hole‐injection contact, (2) a hole‐transport diamine layer using a naphthyl‐substituted benzidine derivative, and (3) an ac drive wave form. These emissive devices have shown an operational half‐lifetime of about 4000 h from an initial luminance of 510 cd/m2.
1,559 citations
TL;DR: In this article, two primary modes of degradation are identified: oxidation of the polymer leads to the formation of aromatic aldehyde, which quenches the fluorescence, and concomitant chain scission results in reduced carrier mobility.
Abstract: Light‐emitting diodes made with poly(2‐methoxy‐5(2′‐ethyl)hexoxy‐phenylenevinylene) (MEH‐ PPV) using indium‐tin‐oxide (ITO) as anode and Ca as cathode have been examined as they age during operation in a dry inert atmosphere. Two primary modes of degradation are identified. First, oxidation of the polymer leads to the formation of aromatic aldehyde, i.e., carbonyl which quenches the fluorescence. The concomitant chain scission results in reduced carrier mobility. ITO is identified as a likely source of oxygen. The second process involves the formation of localized electrical shorts which do not necessarily cause immediate complete failure because they can be isolated by self‐induced melting of the surrounding cathode metal. We have not identified the origin of the shorts, but once they are initiated, thermal runaway appears to accelerate their development. The ultimate failure of many MEH‐PPV devices occurs when the regions of damaged cathode start to coalesce.
442 citations