In situ nanomechanical measurements of interfacial strength in membrane-embedded chemically functionalized si microwires for flexible solar cells

Clara J. Cho, Leslie O'Leary, Nathan S Lewis, Julia R. Greer

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Arrays of vertically aligned Si microwires embedded in polydimethylsiloxane (PDMS) have emerged as a promising candidate for use in solar energy conversion devices. Such structures are lightweight and concurrently demonstrate competitive efficiency and mechanical flexibility. To ensure reliable functioning under bending and flexing, strong interfacial adhesion between the nanowire and the matrix is needed. In situ uniaxial tensile tests of individual, chemically functionalized, Si microwires embedded in a compliant PDMS matrix reveal that chemical functionality on Si microwire surfaces is directly correlated with interfacial adhesion strength. Chemical functionalization can therefore serve as an effective methodology for accessing a wide range of interfacial adhesion between the rigid constituents and the soft polymer matrix; the adhesion can be quantified by measuring the mechanical strength of such systems.

Original languageEnglish
Pages (from-to)3296-3301
Number of pages6
JournalNano Letters
Volume12
Issue number6
DOIs
Publication statusPublished - Jun 13 2012

Fingerprint

in situ measurement
Solar cells
adhesion
Adhesion
solar cells
Polydimethylsiloxane
membranes
Membranes
matrices
Bond strength (materials)
Polymer matrix
Energy conversion
solar energy conversion
Solar energy
Nanowires
Strength of materials
flexing
tensile tests
flexibility
nanowires

Keywords

  • fiber pull-out
  • flexible solar cells mechanical properties
  • in situ tension
  • Si microwires

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanical Engineering

Cite this

In situ nanomechanical measurements of interfacial strength in membrane-embedded chemically functionalized si microwires for flexible solar cells. / Cho, Clara J.; O'Leary, Leslie; Lewis, Nathan S; Greer, Julia R.

In: Nano Letters, Vol. 12, No. 6, 13.06.2012, p. 3296-3301.

Research output: Contribution to journalArticle

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