Yang, Haoran and Bahk, Je-Hyeong and Day, Tristan and Mohammed, Amr M. S. and Min, Bokki and Snyder, G. Jeffrey and Shakouri, Ali and Wu, Yue (2014) Composition Modulation of Ag_2Te Nanowires for Tunable Electrical and Thermal Properties. Nano Letters, 14 (9). pp. 5398-5404. ISSN 1530-6984. doi:10.1021/nl502551c. https://resolver.caltech.edu/CaltechAUTHORS:20141020-085723292
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Abstract
In this article, we demonstrated that composition modulation of Ag_2Te nanowires can be achieved during the self-templated transformation of Te nanowires into Ag_2Te nanowires during solution phase synthesis, which provides a mean to tune the carrier density of the Ag_2Te nanowires. Both nearly stoichiometric and Ag-rich nanowires have been synthesized, which give rise to p-type and n-type Ag_2Te nanocomposites after hot press, respectively. The electrical and thermal properties of the two kinds of samples have been measured. Theoretical modeling based on the near-equilibrium Boltzmann transport equations has been used to understand the experimental results. We found that ZT of the heavily doped n-type sample reaches 0.55 at 400 K, which is the highest ZT value reported for Ag_2Te at the same temperature mainly due to the reduced thermal conductivity by the nanostructures. Theoretical analysis on the carrier transport shows that the power factor is also very well optimized in the doped Ag_2Te sample considering the reduced carrier mobility by the nanostructures.
Item Type: | Article | ||||||||||||
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Alternate Title: | Composition Modulation of Ag2Te Nanowires for Tunable Electrical and Thermal Properties | ||||||||||||
Additional Information: | © 2014 American Chemical Society. Received: July 7, 2014. Revised: August 12, 2014. Published: August 26, 2014. This work is supported by the U.S. Air Force Office of Scientific Research (Award Number FA9550-12-1-0061). The electrical property measurement system is funded by DARPA/Army Research Office under the contract no. W911NF0810347. | ||||||||||||
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Subject Keywords: | Thermoelectric; nanowires; silver telluride; Ag_2Te; nanocomposites | ||||||||||||
Issue or Number: | 9 | ||||||||||||
DOI: | 10.1021/nl502551c | ||||||||||||
Record Number: | CaltechAUTHORS:20141020-085723292 | ||||||||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20141020-085723292 | ||||||||||||
Official Citation: | Composition Modulation of Ag2Te Nanowires for Tunable Electrical and Thermal Properties Haoran Yang, Je-Hyeong Bahk, Tristan Day, Amr M. S. Mohammed, Bokki Min, G. Jeffrey Snyder, Ali Shakouri, and Yue Wu Nano Letters 2014 14 (9), 5398-5404 | ||||||||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||
ID Code: | 50529 | ||||||||||||
Collection: | CaltechAUTHORS | ||||||||||||
Deposited By: | Ruth Sustaita | ||||||||||||
Deposited On: | 20 Oct 2014 18:43 | ||||||||||||
Last Modified: | 10 Nov 2021 18:57 |
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