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:
Journal of Computer-Aided Materials Design
影响因子:
--
通讯作者:
Loppacher
Loppacher
中科院分区:
--
文献类型:
--
作者:
Gemming;Alsheimer;Luschtinetz;Seifert;Loppacher

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本研究旨在模拟由场敏感分子在铁氧化物表面自组装而产生的有机场效应晶体管。基于表面微观性质、分子及其相互作用的电子结构方法与基于跳尺度基础的大型吸附质阵列自组装的经典建模相结合。结合密度泛函理论(DFT)和基于密度泛函的紧密结合理论(DF-TB),对现实的阶梯钛酸盐表面的结构和电子特性以及表面上的电场强度进行了量子力学建模。这些场对极化有机分子的电子和光学性质的影响通过时间依赖的DFT和DF-TB方法进行了研究。对于有机组分的自组装积分,基于从头算和第一性原理数据,建立了一个用于分子覆盖阶梯表面的经典伊辛哈密顿函数。
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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