The maximum switching ratio 62.1 is obtained at 1 V bias. The current through the twisted form of the cytosine biomolecule is ∼1000 times higher than the straightened form. This p and n regions of this switch has been made using electrical doping process. The straightened and twisted forms of the molecule are represented as logic ‘0’ and logic ‘1’, respectively.
The biomolecule comprises switching behaviour when converts from straightened to twisted form during photo‐excitement. The aim of this study is to highlight the minimum conformational change during a single ON–OFF switching cycle. The influence of highest occupied molecular orbital–lowest unoccupied molecular orbital (HOMO–LUMO) gaps on the electronic transmission and I–V characteristics has been discussed in detail. The quantum‐ballistic transport property and current–voltage (I–V) characteristics of cytosine‐based optomolecular switch have been investigated at 25 THz operating frequency. This possible biomolecular switch has been designed using the first principle approach which is based on density functional theory and non‐equilibrium Green's function. This study represents an empirical model of cytosine‐based optical molecular switch.
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