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Electrode materials for biphenyl-based rectification devices

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Abstract

An ab initio approach was utilized to explore the electronic transport properties of 4′-thiolate-biphenyl-4-dithiocarboxylate (TBDT) sandwiched between two electrodes made of various materials X (X = Cu, Ag, and Au). Analysis of current–voltage (I–V) characteristics, rectification performance, transmission functions, and the projected density of states (PDOS) under various external voltage biases showed that the transport properties of these constructed systems are markedly impacted by the choice of electrode materials. Further, Cu electrodes yield the best rectifying behavior, followed by Ag and then Au electrodes. Interestingly, the rectification effects can be tuned by changing the torsion angle between the two phenyl rings, as well as by stretching the contact distances between the end group and the electrodes. For Cu, the maximum rectifying ratio increases by 37 % as the contact distance changes from 1.7 Å to 1.9 Å. This is due to an increase in coupling strength asymmetry between the molecule and the electrodes. Our findings are compared with the results reported for other systems. The present calculations are helpful not only for predicting the optimal electrode material for practical applications but also for achieving better control over rectifying performance in molecular devices.

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Acknowledgments

The authors thank the Computational Nanoscience & Technology Laboratory (CNTL), Atal Bihari Vajpayee (ABV)–Indian Institute of Information Technology & Management, Gwalior (India) for providing the computational and infrastructural facilities.

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Authors and Affiliations

  1. Nanomaterials Research Group, Computational Nanoscience & Technology Laboratory (CNTL), ABV–Indian Institute of Information Technology & Management (ABV-IIITM), Gwalior, 474015, India

    Sweta Parashar, Pankaj Srivastava & Manisha Pattanaik

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  1. Sweta Parashar
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  2. Pankaj Srivastava
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  3. Manisha Pattanaik
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Correspondence to Pankaj Srivastava.

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Parashar, S., Srivastava, P. & Pattanaik, M. Electrode materials for biphenyl-based rectification devices. J Mol Model 19, 4467–4475 (2013). https://doi.org/10.1007/s00894-013-1938-1

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