Modelling ferroic functional elements
Modelling ferroic functional elements
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铁性功能元件建模
DOI:
10.1007/s10820-007-9076-7
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发表时间:
2007
期刊:
影响因子:
--
通讯作者:
Loppacher
中科院分区:
文献类型:
--
作者:
Gemming;Alsheimer;Luschtinetz;Seifert;Loppacher
The present study aims at the modelling of an organic field-effect transistor generated by the self-assembly of field-sensitive molecules on the surfaces of ferroic oxides. Electronic-structure-based methods for the microscopic properties of the surface, the molecules, and the respective interactions are combined with classical modelling on the self-assembly of larger adsorbate arrays on a scale-hopping basis. The structural and electronic characteristics of a realistic, stepped titanate surface as well as the electric field strength above such a surface are modelled quantum-mechanically by a combination of density-functional theory (DFT) and density-functional-based tight-binding (DF-TB). The effect of such fields on the elctronic and optical properties of polarizable organic molecules is investigated by the time-dependent analogues of the DFT and DF-TB methods. For the integration of organic components via self-assembly a classical Ising Hamiltonian is developped for the coverage of stepped surfaces with molecules and parametrized on the basis of ab-initio and first-principles data.
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DOI:
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1998
期刊:
影响因子:
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作者:
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1999
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2005
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