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Information × Registration Number 0212U000127, 0111U008406 , R & D reports Title Optimization of organic field-effect transistors. popup.stage_title Head Kadashchuk Andrey Konstantinovich, Registration Date 18-01-2012 Organization Institute of physics NASU popup.description2 The aim of the research project was the comprehensive study of electric field effect on the charge transport in channel of organic field effect transistors (OFETs) based on thin films of fullerene C60 grown by hot wall epitaxy. Using the effective medium approach the new extended analytical model of charge transport in organic semiconductor materials with energy disorder of gauss type was developed which gives an adequate description, both qualitative and quantitative, of the influence of lateral electric field on temperature dependence of drift mobility under arbitrary charge density, with taking into account the spatial correlations for energy of charge states. The model provides the compact analytical relations, which interconnect the material parameters, effective concentration of charge carriers and field strength in OFET channel. This allows to reject a zero-field approach and to propose the method of simultaneous determination of the half-width of the density of charged states function and effective parameter of local field inhomogeneity for organic materials using the Meyer-Neldel energy values obtained for the finite magnitudes of field strength. For the first time, it was carried out the research of the effect of lateral field and concentration of charge carriers on the temperature dependence of drift mobility in OFETs based on the film of fullerene C60 at the range of not very low temperatures, at that the mobility values had been taken from transfer voltage-current characteristics of the OFET. The calculation results based on the extended model of charge transport were in good quantitative agreement with the experimental data. The effect of morphology of the fullerene C60 film on the field dependence of charge mobility appears through the variation of energy disorder: an enlargement of the width of localized charge states distribution (due to reducing in mean crystallite's size and degree of film's crystallinity) decreases appreciably the absolute values of charge carriers mobility, but enhances the field dependence of mobility and the Meyer-Neldel energy as well. Product Description popup.authors Вахнін Олександр Юрійович Кадащук Андрій Костянтинович Скришевський Юрій Антонович Фіщук Іван Іванович popup.nrat_date 2020-04-02 Close