Abstract
The paper deals with the study of optical, electrical and dielectric properties of thin film organic materials suitable for the preparation of optoelectronic devices (e.g. photodiodes, phototransistors, photovoltaic cells). As active layers palladium phthalocyanine (PdPc[t-Bu] 4 ), fullerene (acceptor material, PCBM) and their mixture (9:5 mass %) were used. Thin films were prepared by two methods: by spin coating (Chemat technology Spin Coater) and by material inkjet printing (Dimatix Materials Printer DMP-2800). UV-VIS spectroscopy and ellipsometry were used to study the optical properties. The paper also presents results of electrical and dielectric measurements. We found out that the properties of all structures prepared by spin coating depend on the rotational speed of spin coater, on the mode of solution casting (static, dynamic) and in the case of material inkjet printing they are too much influenced by the substrate. Samples prepared on the substrate at 60 °C showed a photovoltaic effect with fill factor about 0.25 and the conversion efficiency about 0.2 %. DOI: http://dx.doi.org/10.5755/j01.ms.21.3.7278
Highlights
We have witnessed a rapid development of electrical and dielectric applications of organic semiconductors in recent years [1]
To study optical properties the UV-VIS spectroscopy and the ellipsometry were applied, while electrical and dielectric properties were evaluated by using of impedance spectroscopy and measurement of current-voltage (I-V) characteristics
The maximum absorption occurs for both materials (PdPc, PdPc/PCBM) at about 620 nm and the absorption edge is situated at approximately 750 nm
Summary
Active layers for optical measurements were prepared both by spin coating and by material inkjet printing on the special glass substrate. To prepare the structure of thin film layers for electrical measurements, only the material inkjet printer was used. For the samples prepared by spin coating the difference between optical properties of thin films prepared in static and dynamic mode was investigated, in the dynamic mode the influence of rotational speed to the layer thickness and to their structure. For the layers prepared by material inkjet printing, the influence of temperature films on their optical, electrical and dielectric properties was studied (substrate temperature has influence on the formed thin film density, which is responsible for crystallographic, structural and optical properties [12])
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