Modulation of thermoelectric power factor via radial dopant inhomogeneity in B-doped Si nanowires

Fuwei Zhuge, Takeshi Yanagida, Naoki Fukata, Ken Uchida, Masaki Kanai, Kazuki Nagashima, Gang Meng, Yong He, Sakon Rahong, Xiaomin Li, Tomoji Kawai

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We demonstrate a modulation of thermoelectric power factor via a radial dopant inhomogeneity in B-doped Si nanowires. These nanowires grown via vapor-liquid-solid (VLS) method were naturally composed of a heavily doped outer shell layer and a lightly doped inner core. The thermopower measurements for a single nanowire demonstrated that the power factor values were higher than those of homogeneously B-doped Si nanowires. The field effect measurements revealed the enhancement of hole mobility for these VLS grown B-doped Si nanowires due to the modulation doping effect. This mobility enhancement increases overall electrical conductivity of nanowires without decreasing the Seebeck coefficient value, resulting in the increase of thermoelectric power factor. In addition, we found that tailoring the surface dopant distribution by introducing surface d-doping can further increase the power factor value. Thus, intentionally tailoring radial dopant inhomogeneity promises a way to modulate the thermoelectric power factor of semiconductor nanowires.

Original languageEnglish
Pages (from-to)14100-14106
Number of pages7
JournalJournal of the American Chemical Society
Volume136
Issue number40
DOIs
Publication statusPublished - Oct 8 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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