Kaur Milanpreet, Sawhney Ravinder Singh, Engles Derick
Department of Electronics Technology, Guru Nanak Dev University, Amritsar, Punjab, 143001, India.
J Mol Graph Model. 2017 Jan;71:184-191. doi: 10.1016/j.jmgm.2016.10.017. Epub 2016 Dec 1.
We present ab-initio scrutiny of electron transport through C fullerene cleaved with gold electrodes having unique set of miller orientations. The three families of miller indices {100}, {110} and {111} are considered with four exclusive device models for elucidating electronic transport under applied potential of - 2 to +2V. Thereafter, the quantum calculations employing DFT-NEGF are performed for envisaging density of states, transmission function, energy levels, molecular orbitals, charge transfer. These electronic transfer parameters lead to the study of its two electrical parameters: current and conductance. We conclude that in molecular-devices of constituted miller family {110}, HOMO-LUMO gap are inversely proportional to extent of charge carriers. While for miller devices {100} and {111}, the situation is fully contrasting with HOMO-LUMO gap being directly proportional to its charge carriers. Another important conclusion is that the gold electrodes having miller family {100} and {111} are providing equal opportunity to fullerene molecule to imply its behavior while electrodes of miller family {110} are over shadowing the performance of fullerene molecule.
我们对通过用具有独特米勒指数取向集的金电极切割的C富勒烯的电子输运进行了从头算研究。考虑了米勒指数的三个族{100}、{110}和{111},并采用四种独特的器件模型来阐明在-2至+2V外加电势下的电子输运。此后,进行了采用密度泛函理论-非平衡格林函数(DFT-NEGF)的量子计算,以设想态密度、传输函数、能级、分子轨道、电荷转移。这些电子转移参数导致了对其两个电学参数的研究:电流和电导。我们得出结论,在由米勒族{110}构成的分子器件中,最高占据分子轨道-最低未占据分子轨道(HOMO-LUMO)能隙与电荷载流子的数量成反比。而对于米勒器件{100}和{111},情况则完全相反,HOMO-LUMO能隙与其电荷载流子成正比。另一个重要结论是,具有米勒族{100}和{111}的金电极给予富勒烯分子同等机会来展现其行为,而米勒族{110}的电极则掩盖了富勒烯分子的性能。