10 μm minority-carrier diffusion lengths in Si wires synthesized by Cu-catalyzed vapor-liquid-solid growth

Morgan C. Putnam, Daniel B. Turner-Evans, Michael D. Kelzenberg, Shannon W. Boettcher, Nathan S Lewis, Harry A. Atwater

Research output: Contribution to journalArticle

73 Citations (Scopus)

Abstract

The effective electron minority-carrier diffusion length, Ln,eff, for 2.0 μm diameter Si wires that were synthesized by Cu-catalyzed vapor-liquid-solid growth was measured by scanning photocurrent microscopy. In dark, ambient conditions, Ln,eff was limited by surface recombination to a value of 0.7 μm. However, a value of Ln,eff =10.5±1 μm was measured under broad-area illumination in low-level injection. The relatively long minority-carrier diffusion length observed under illumination is consistent with an increased surface passivation resulting from filling of the surface states of the Si wires by photogenerated carriers. These relatively large Ln,eff values have important implications for the design of high-efficiency, radial-junction photovoltaic cells from arrays of Si wires synthesized by metal-catalyzed growth processes.

Original languageEnglish
Article number163116
JournalApplied Physics Letters
Volume95
Issue number16
DOIs
Publication statusPublished - 2009

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diffusion length
minority carriers
wire
vapors
liquids
illumination
photovoltaic cells
passivity
photocurrents
injection
microscopy
scanning
metals
electrons

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Putnam, M. C., Turner-Evans, D. B., Kelzenberg, M. D., Boettcher, S. W., Lewis, N. S., & Atwater, H. A. (2009). 10 μm minority-carrier diffusion lengths in Si wires synthesized by Cu-catalyzed vapor-liquid-solid growth. Applied Physics Letters, 95(16), [163116]. https://doi.org/10.1063/1.3247969

10 μm minority-carrier diffusion lengths in Si wires synthesized by Cu-catalyzed vapor-liquid-solid growth. / Putnam, Morgan C.; Turner-Evans, Daniel B.; Kelzenberg, Michael D.; Boettcher, Shannon W.; Lewis, Nathan S; Atwater, Harry A.

In: Applied Physics Letters, Vol. 95, No. 16, 163116, 2009.

Research output: Contribution to journalArticle

Putnam, Morgan C. ; Turner-Evans, Daniel B. ; Kelzenberg, Michael D. ; Boettcher, Shannon W. ; Lewis, Nathan S ; Atwater, Harry A. / 10 μm minority-carrier diffusion lengths in Si wires synthesized by Cu-catalyzed vapor-liquid-solid growth. In: Applied Physics Letters. 2009 ; Vol. 95, No. 16.
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