Highly Porous Silicon Nanowires Made with Solvent-Mediated Wet Chemical Etching and Their Thermoelectric Applications

Chien Hsin Tang, Wen Jin Li, Chia Hsiang Hung, Po Hsuan Hsiao, Chia-Yun Chen

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Porous silicon (Si) nanostructures with heavily doping concentrations possess many intriguing properties different from bulk Si, but the fabrication remains greatly challenging for the large-quantity production. Therefore, in this study, the heavily doped Si nanowires with highly porous features were prepared using a co-solvent mediated metal-assisted chemical etching (MaCE). Unlike the conventional MaCE method with sole water as solvents, the mixed co-solvents, with the addition of highly volatile methanol at ambient temperature are found to facilitate the significant sidewall etching through the evaporation of solvents when etching reaction proceeds. In addition, thermoelectric performances of incorporating such porous Si nanowires as inclusions with (BiSb)2Te3 particles as matrix were investigated. The beneficial effects, examined from three various amounts of Si nanowires dispersed in (BiSb)2Te3 matrix, are originated from the supplement of increased carrier concentrations. Meanwhile, the increase of thermal conductivity is not obvious due to the existence of porous Si nanowires, thus leading to the improved figure of merit (ZT) value, which is more than 1.3 times higher than that of pure (BiSb)2Te3 samples.

Original languageEnglish
Pages (from-to)10865-10870
Number of pages6
JournalChemistrySelect
Volume2
Issue number33
DOIs
Publication statusPublished - 2017 Jan 1

Fingerprint

Wet etching
Porous silicon
Nanowires
Etching
Silicon
Metals
Carrier concentration
Methanol
Nanostructures
Thermal conductivity
Evaporation
Doping (additives)
Fabrication
Water
Temperature

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

Cite this

Tang, Chien Hsin ; Li, Wen Jin ; Hung, Chia Hsiang ; Hsiao, Po Hsuan ; Chen, Chia-Yun. / Highly Porous Silicon Nanowires Made with Solvent-Mediated Wet Chemical Etching and Their Thermoelectric Applications. In: ChemistrySelect. 2017 ; Vol. 2, No. 33. pp. 10865-10870.
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Highly Porous Silicon Nanowires Made with Solvent-Mediated Wet Chemical Etching and Their Thermoelectric Applications. / Tang, Chien Hsin; Li, Wen Jin; Hung, Chia Hsiang; Hsiao, Po Hsuan; Chen, Chia-Yun.

In: ChemistrySelect, Vol. 2, No. 33, 01.01.2017, p. 10865-10870.

Research output: Contribution to journalArticle

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