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In Situ Nanomechanical Measurements of Interfacial Strength in Membrane-Embedded Chemically Functionalized Si Microwires for Flexible Solar Cells

Cho, Clara J. and O’Leary, Leslie and Lewis, Nathan S. and Greer, Julia R. (2012) In Situ Nanomechanical Measurements of Interfacial Strength in Membrane-Embedded Chemically Functionalized Si Microwires for Flexible Solar Cells. Nano Letters, 12 (6). pp. 3296-3301. ISSN 1530-6984. http://resolver.caltech.edu/CaltechAUTHORS:20120621-133116661

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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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/nl3014007DOIArticle
http://pubs.acs.org/doi/abs/10.1021/nl3014007PublisherArticle
ORCID:
AuthorORCID
Lewis, Nathan S.0000-0001-5245-0538
Greer, Julia R.0000-0002-9675-1508
Additional Information:© 2012 American Chemical Society. Received: April 14, 2012; Revised: May 9, 2012; Published: May 21, 2012. C.J.C. gratefully acknowledges the financial support of the Resnick Institute at Caltech through her graduate fellowship and E. Warren for help with wafer patterning. L.O’L. thanks the financial support of the Link Foundation Energy fellowship. N.S.L.’s portion of this work was supported by the National Science Foundation (NSF-CHE-0911682) and (NSF-CHE-0802907). J.R.G. is grateful to the Caltech’s CI-2 Innovation Grant for supporting this work.
Group:Resnick Sustainability Institute, CCI Solar Fuels
Funders:
Funding AgencyGrant Number
Resnick Institute UNSPECIFIED
Link Foundation Energy fellowshipUNSPECIFIED
NSFCHE-0911682
NSFCHE-0802907
Caltech’s CI-2 Innovation GrantUNSPECIFIED
Record Number:CaltechAUTHORS:20120621-133116661
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20120621-133116661
Official Citation: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, and Julia R. Greer Nano Letters201212 (6), 3296-3301
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:32012
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:28 Jun 2012 21:58
Last Modified:10 Sep 2015 23:56

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