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Luminescence and structural properties of thermally evaporated benzanthrone dyes thin films

100%

Bulanovs A. , Kirilov G. , Fleisher M. , Kirilova E. , Mihailova I.

Opto-Electronics Review

2013

tom Vol. 21, No. 2

227-232

We report optical and luminescence properties of 3-N, N-diacetylaminobenzanthrone thin films deposited on glass substrate by thermal evaporation. The structural and optical properties of organic thin films were studied by means of the confocal microscope with an input of femtosecond laser radiation, X-ray diffractometer, and scanning electron microscope (SEM). Intense luminescence with the maximum at 530 nm was observed when excited by laser radiation with the wavelengths 458, 476, 488, 496, 514 nm. In addition, the luminescence caused by two-photon absorption of femtosecond (fs) laser radiation has been investigated. Semi empirical calculations by AM1 and ZINDO/S methods and ab initio calculations using Gaussian software were carried out to estimate the electron system of structure. The calculations show planar configurations for the aromatic core and diacetylamino fragment of this compound. The study of the structure of benzanthrone derivative thin films with X-ray diffraction (XRD) methods, indicates the distance between molecular layers and ordered molecular fragments.

Small signal admittance spectroscopy applied for extraction of charge carrier mobility in thin organic layers

100%

Jarosz G. , Signerski R.

Opto-Electronics Review

2011

tom Vol. 19, No. 4

474-477

The work presents new way of extraction of charge carrier mobility from small signal spectra of admittance. It can be a useful method for thin organic layers in a sandwich arrangement. It is better than the version of small signal admittance currently applied for getting charge carrier mobility, since the final result is not charged with uncertainty of geometric capacitance and the upper limit of measurable charge carrier mobility is higher.

Investigations of morphology and optical properties of thin films of TiOPc/PTCDA donor acceptor couple

75%

Weszka J. , Jarka P. , Hajduk B. , Chwastek-Ogierman M.

Journal of Achievements in Materials and Manufacturing Engineering

2012

tom Vol. 55, nr 2

396--402

Purpose: The aim of this work is studying surface topography and optical properties of organic thin films of TiOPc and PTCDA blends deposited by thermal vacuum evaporation. Design/methodology/approach: Thin films of blends of organic materials are provided as donor/acceptor couples in bulk heterojunction based organic solar cells. Thin films of TiOPc - PTCDA mixture have been deposited by thermal vacuum evaporation from one source with various ratios of blends components and deposition rates used. Both the chemical composition and technological parameters of the deposition process have appeared to influence on optical properties, UV-Vis absorption spectra in particular, and surface morphology of the as-prepared thin films. The paper reveals the methodology of deposition thin films of TiPc-PTCDA donor/ acceptor blends and the influence of deposition parameters on their properties. Findings: Thin films of such blends can be used for the research on the planar heterojunction solar cells based on donor-acceptor couple active layers. Results of these investigations suggest that blends of TiOPc and PTCDA can be suitable materials for preparing organic photovoltaic devices. Research limitations/implications: Deposition parameters and proportions of the blend components used determine the properties of TiOPc/PTCDA thin films. Originality/value: The goal of this paper is also to define relations connecting the surface morphology and optical properties of thin films of TiOPc-PTCDA blend prepared with their composition and parameters of the evaporation process.

Researches of topography and optical properties of the thin films NiPc/PTCDA donor acceptor couple

75%

Weszka J. , Jarka P. , Chwastek-Ogierman M. , Hajduk B.

Journal of Achievements in Materials and Manufacturing Engineering

2012

tom Vol. 53, nr 2

81--88

Purpose: The aim of this work consists of researches of surface topography and optical properties of organic thin films of NiPc : PTCDA blends deposited by thermal evaporation from one source. Thin films of organic materials are provided as donor/acceptor couple in heterojuction solar cells. Design/methodology/approach: Films consisting of NiPc and PTCDA mixture were deposited by thermal evaporation from one source. By using blends with different PTCDA to NiPc ratios and steering the temperature of the sources and hence deposition rate different properties of layers are obtained. Findings: Both the chemical composition and technological parameters of deposition process has appeared to influence on optical properties and surface morphology of thin films. These parameters were found to influence surface morphology and UV-Vis absorption spectra. Research limitations/implications: The paper shows the methodology of deposition NiPc/PTCDA donor/ acceptor blends and the influence of evaporation parameters on properties of thin films. That can be used for the research of the planar heterojunction solar cells based on NiPc/PTCDA heterojunction donor-acceptor couple active layers. Practical implications: Results of researches suggest that blends of NiPc and PTCDA can be useful materials in organic photovoltaic device. However right deposition parameters and the blends proportions determine the properties of NiPc/PTCDA donor/acceptor thin films. Originality/value: The goal of this paper is to definie the surface topography and optical properties of thin films NiPc/PTCDA blends prepared with different proportions of components and parameters of evaporation process.