Abstract
Electrical, photoelectrical, and optical properties of thin films of a new heat-resistant polyphenylquinoline synthesized using facile methods were investigated. An analysis of the obtained temperature dependences of the dark conductivity and photoconductivity indicates the hopping mechanism of conductivity over localized states arranging at the energy distance of 0.8 eV from the Fermi level located inside the band gap of the investigated material. The optical band gap of the studied material was estimated from an analysis of the spectral dependences of the photoconductivity and absorption coefficient before (1.8–1.9 eV) and after (2.0–2.2 eV) annealing at temperatures exceeding 100 °C. The Gaussian character of the distribution of the localized states of density inside the band gap near the edges of the bands was established. A mechanism of changes in the optical band gap of the investigating polymer under its annealing is proposed.
Highlights
Polyquinolines have been well known for a long time as polymeric materials with high thermal and oxidative stability [1,2,3]
Differential scanning calorimetry (DSC) data for polyphenylquinoline class (PPQ)–DBT show that glass-transition temperature, Tg, is 301 ◦ C (Figure S4)
The polymer films evaluated by thermogravimetric analysis (TGA) (Figure S5) indicate a very high thermal stability of PPQ–DBT: The decomposition of the polymer backbone begins at 550 ◦ C
Summary
Polyquinolines have been well known for a long time as polymeric materials with high thermal and oxidative stability [1,2,3] Such properties are needed for conductive and photoconductive conjugated polymers developing for light-emitting diodes and photovoltaic cells [4,5,6] which certainly heat up during operation. From the point of view of photosensitivity, polymers containing both electron-donor and electron-acceptor moieties in the monomer unit are promising as photoconductive materials. From this point of view, nitrogen-containing polymers of the polyphenylquinoline class (PPQ) are of interest. General formula of poly-2,6-phenylquinolines, where X is a bridging group, Ar is a heteroarylene moiety
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