Influence of technological conditions on optical properties and morphology of spin-coated PPI thin films

摘要

Purpose: The aim of this paper is to show technical and chemical parameters influence on optical properties and morphology of poly (1,4-phenylenemethylenenitrilo- 1,4-phenylenenitrilomethylene) (PPI) thin films prepared by spin-coating methodDesign/methodology/approach: PPI thin films were prepared by spin-coating method with various spinning rates and molar concentrations. The monomers, terephthal aledehyde (TPA) and p-phenylenediamine (PPDA), were dissolved in tetrahydrofuran (THF) and then mixed. Optical properties of PPI thin films were examined by UV-Vis and IR spectroscopy. Surface morphology of thin films were tested by atomic force microscopy.Findings: This paper show the influence of technical parameters of spin coating process onto properties of deposited thin films, such as thickness, optical properties and morphology.Research limitations/implications: Optimizing spinning rates and concentrations of monomers is excepted to allow for thin films to have required properties.Practical implications: Conjugated polymers with heteroatom in the backbone like PPI are very interesting materials for their electronic properties. PPI can be used as active element in organic both solar cells and light-emitting diodes (LEDs).Originality/value: Spin-coating method is very cheap and fast method to prepare PPI thin films as compared with CVD method. Recognizing of optimal speed rate and concentration of solution will make thin films with required properties to be prepared