Effect of dopant on the intrinsic properties of some multifunctional aromatic compounds films for target applications

Molecular organic crystalline matrix for hybrid organic–inorganic (nano) composite materials

“…We have chosen as source for doping with Ag, a silver complex, ½AgðNH 3 Þ 2 Cl obtained in a two stages process following the chemical reactions given below, starting from silver nitrate [29]:…”

“…In this case, the dominant weak character of van der Waals bonding of the organic molecules is not modified because Ag does not interact with benzil molecules and the structure of the fundamental absorption edge is not affected preserving the narrow peaks structure. The peak situated at 380 nm is correlated with some particularities of the benzil molecular configuration and it is assigned to the absorption of the dicarbonyl groups [24,29].…”

Organic Semiconductor Based Heterostructures for Optoelectronic Devices

“…Two different methods have been used to prepare organic molecular thin films: 1. the rapid directional solidification method and 2. the vacuum evaporation and deposition method. It is adequate to grow films from organic compounds with a melting point T melting <100°C between two silicon wafers using a temperature gradient for solidification ΔT>50°C to www.intechopen.com counteract the supercooling that characterises the large molecule organic compounds (Stanculescu, 2004;Stanculescu, 2006b;Stanculescu, 2006c). This method has been also used for the preparation of doped organic semiconductor layer.…”

“…The organic molecular films show some particularities of the transport mechanism of the charge carriers, small amount of impurity or dopant strongly affecting or even masking or hiding the intrinsic properties by a trapping mechanism. It has been evidenced that the relatively low intrinsic conductivity of optical wide-gap organic semiconductor, benzil [Eg=2.84 eV (Stanculescu, 2004; and m-DNB [Eg=2.92 eV (Stanculescu, 2004; a)] has been improved by doping: in benzil doped with m-DNB and, in m-DNB doped with 8-hydroxyquinoline (oxine) or 1,3 dihydroxybenzene (resorcinol). In these situations the resistivity of the organic layer decreases to 10 6 -10 7 Ωcm.…”

Investigation of emission properties of doped aromatic derivative organic semiconductor crystals

“…The interest for studying organic crystals can also be justified by the perspective to use these materials as crystalline host matrices for inorganic [4][5][6][7][8][9] or organic guests [6,[9][10][11]]. An organic matrix can assure an efficient fluorescence mechanism, while the guest component can improve some properties such as electrical mobility, thermal stability, magnetic and dielectric transitions and can also influence the emission properties of the matrix.…”