Abstract
CdS1–x Se x colloidal nanocrystals (NCs) were synthesized by colloidal chemistry route. Both lattice parameters and band structure were modulated by tuning the content of Se. As the Se content increases, the peak of UV–Visible absorbance spectrum of CdS1−x Se x shifts toward longer wavelength direction, indicating the reduction of band gap. Devices with Au/CdS1−x Se x NCs/Au structures have been fabricated by assembling the obtained CdS1−x Se x NCs into Au microelectrodes via dielectrophoresis method. It is found that the rectifying polarities of the devices are strongly dependent on the content of Se. With the increasing Se content, the rectification polarity changes from backward to forward. This polarity tuning could be caused by the change of the relative height of the Fermi levels between CdS1−x Se x and Au. The Se-content-dependent rectifying behavior may offer us an opportunity to design novel logical structure in NC-based nanoelectronics.
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Acknowledgments
This work was supported by the Open Fund of IPOC (BUPT), the National Natural Science Foundation of China (51072182, 51172208, 61274017), China Postdoctoral Science Foundation Funded Project (2014M550661), the Qianjiang Talent Program of Zhejiang Province (Grant No. QJD1202004), and the National Basic Research Program of China (973 Program) (2010CB933501, 2010CB923202).
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An, Y., Wu, Z., Chu, X. et al. Composition tuning of rectifying polarity of colloidal CdS1−x Se x nanocrystal-based devices. J Nanopart Res 17, 119 (2015). https://doi.org/10.1007/s11051-015-2923-7
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DOI: https://doi.org/10.1007/s11051-015-2923-7