Solution Phase Synthesis of Radial-Axial Heterostructured Nanowires with Coherent Interfaces

Samantaray, D and Kumar, A and Ghosh, P and Chatterjee, D and Bellare, P and Pandey, M and Chandni, U and Ravishankar, N (2021) Solution Phase Synthesis of Radial-Axial Heterostructured Nanowires with Coherent Interfaces. In: Journal of Physical Chemistry C, 125 . pp. 3102-3109.

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Abstract

Semiconducting nanowires with modulated structures are potential candidates for application in nanoelectronics and photonics devices and are crucial for the fundamental understanding of electron transport in quantum confined systems. Among these semiconductors, Te (having a low band gap of �0.32 eV) finds numerous applications in the field of optoelectronics, thermoelectrics, and memory devices. Te-based compounds like lead telluride, bismuth telluride, and antimony telluride have been extensively used as thermoelectric materials. Moreover, superlattice structures of semiconducting nanomaterials are known to show enhanced properties as compared to their individual counterparts. However, a simple and general scheme to achieve a superlattice 1-D nanostructure with a coherent interface is still challenging. Here, we demonstrate a facile wet chemical synthesis method for designing PbTe-Bi2Te3 1D-superlattice nanostructure on Te nanowires. These superlattice nanowires are characterized using various electron microscopy techniques that reveal chemically distinct regions having PbTe and Bi2Te3 phases with a coherent interface between them. The volume fractions of the PbTe and Bi2Te3 phases in these nanowires can be easily tuned with changing the concentration of the Pb precursor and the addition rate of the reducing agent. The electrical transport measurement on these heterostructure nanowires indicates a rectifying behavior that can be useful for designing future optoelectronics devices. Further, a measured energy barrier of �0.1 ± 0.08 eV at the interface between the PbTe cube and the Bi2Te3 wire using electrostatic force microscopy can be responsible for the observed nonlinearity in the transport character. © 2021 American Chemical Society.

Item Type:	Journal Article
Publication:	Journal of Physical Chemistry C
Publisher:	American Chemical Society
Additional Information:	The copyright of this article belongs to American Chemical Society
Keywords:	Antimony compounds; Bismuth compounds; Electric force microscopy; Electron transport properties; Electrostatic force; Energy gap; IV-VI semiconductors; Lead compounds; Nanowires; Narrow band gap semiconductors; Quantum chemistry; Synthesis (chemical); Thermoelectricity, Electrical transport measurements; Electrostatic force microscopy; Heterostructured Nanowires; Quantum confined systems; Semiconducting nanowires; Solution phase synthesis; Super-lattice structures; Thermo-Electric materials, Tellurium compounds
Department/Centre:	Division of Chemical Sciences > Materials Research Centre Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited:	05 Mar 2021 07:16
Last Modified:	05 Mar 2021 07:16
URI:	http://eprints.iisc.ac.in/id/eprint/68110

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