Electronic transport properties of 1-(p-R-phenacyl)-4-{[(1′-ethylcarboxylate)-(3′-p-R′-phenacyl)]-7′-indolizinyl}pyridinium bromides in thin films

Abstract The temperature dependences of electrical conductivity, σ , and Seebeck coefficient, S , for some new pyridium monoquaternary salts derivatives, 1-( p -R-phenacyl)-4-{[(1′-ethylcarboxylate)-(3′- p -R′-phenacyl)]-7′-indolizinyl}pyridinium bromides have been studied. The film samples ( d  = 0.08–0.28 μm) have been deposited onto glass by an immersion technique (dimethylformamide was used as a solvent). The investigated compounds behave as typical p-type polycrystalline semiconductors. The activation energy of electrical conduction ranged between 0.65 and 1.72 eV, while the ratio of charge carrier mobilities laid in the range (0.60–0.83). The model based on band gap representation is suitable in explaining the electronic transport in present compounds in the higher temperature range (385–500 K).