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Electrical Characteristics of the Junction between PEDOT:PSS and Thiophene-Functionalized Silicon Microwires

Bruce, Jared P. and Oliver, Derek R. and Lewis, Nathan S. and Freund, Michael S. (2015) Electrical Characteristics of the Junction between PEDOT:PSS and Thiophene-Functionalized Silicon Microwires. ACS Applied Materials & Interfaces, 7 (49). pp. 27160-27166. ISSN 1944-8244.

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Thiophene moieties have been attached to Si microwires (Si MWs) by a two-step chlorination/alkylation reaction method. X-ray photoelectron spectroscopy indicated that saturation of the surface occurred after 30 min of reaction time. Electrical measurements using a standard probe station indicated that the junction between individual thiophene-functionalized Si MWs and the conducting polymer poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate) (PEDOT:PSS) became more ohmic as more thiophene was added to the MW surface. Under a light-limited current of 20 nA, representative of operation of Si MWs under 1 Sun illumination conditions, the iR loss of thiophene-n-Si MW/PEDOT-PSS contacts was 20 mV, representing an order of magnitude reduction compared with PEDOT-PSS junctions formed with methyl terminated n-Si MWs. Such iR losses are much less than typical catalytic overpotentials for fuel formation, and hence the thiophene-functionalized Si MW contacts will not limit the performance of a Si MW array-based solar fuels device under 1 Sun illumination.

Item Type:Article
Related URLs:
URLURL TypeDescription Information
Lewis, Nathan S.0000-0001-5245-0538
Freund, Michael S.0000-0003-1104-2292
Additional Information:© 2015 American Chemical Society. Received: August 19, 2015; Accepted: November 17, 2015; Published: November 17, 2015. Financial support from the Natural Sciences and Engineering Research Council (NSERC) of Canada, the Canada Foundation for Innovation (CFI), the Manitoba Research and Innovation Fund, and the University of Manitoba is gratefully acknowledged. The work reported made use of surface characterization infrastructure in the Manitoba Institute for Materials. This work was supported by the NSF grant No. CHE-1214152 and made use of the Molecular Materials Research Center of the Beckman Institute at Caltech and the Kavli Nanoscience Institute at Caltech. This research was undertaken, in part, thanks to funding from the Canada Research Chairs Program. The authors declare no competing financial interest.
Group:Kavli Nanoscience Institute
Funding AgencyGrant Number
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Canada Foundation for InnovationUNSPECIFIED
Manitoba Research and Innovation FundUNSPECIFIED
University of ManitobaUNSPECIFIED
Canada Research Chairs ProgramUNSPECIFIED
Subject Keywords:artificial photosynthesis, microwires, silicon, electrical characteristics, PEDOT:PSS, surface functionalization
Issue or Number:49
Record Number:CaltechAUTHORS:20160105-150655557
Persistent URL:
Official Citation:Electrical Characteristics of the Junction between PEDOT:PSS and Thiophene-Functionalized Silicon Microwires Jared P. Bruce, Derek R. Oliver, Nathan S. Lewis, and Michael S. Freund ACS Applied Materials & Interfaces 2015 7 (49), 27160-27166 DOI: 10.1021/acsami.5b07725
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:63396
Deposited By: Tony Diaz
Deposited On:06 Jan 2016 00:52
Last Modified:03 Oct 2019 09:28

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