Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 27160-27166 |
| Number of pages | 7 |
| Journal | ACS Applied Materials and Interfaces |
| Volume | 7 |
| Issue number | 49 |
| DOIs | |
| Publication status | Published - Dec 16 2015 |
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Keywords
- artificial photosynthesis
- electrical characteristics
- microwires
- PEDOT:PSS
- silicon
- surface functionalization
ASJC Scopus subject areas
- Materials Science(all)
Cite this
Electrical Characteristics of the Junction between PEDOT : PSS and Thiophene-Functionalized Silicon Microwires. / Bruce, Jared P.; Oliver, Derek R.; Lewis, Nathan S; Freund, Michael S.
In: ACS Applied Materials and Interfaces, Vol. 7, No. 49, 16.12.2015, p. 27160-27166.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Electrical Characteristics of the Junction between PEDOT
T2 - PSS and Thiophene-Functionalized Silicon Microwires
AU - Bruce, Jared P.
AU - Oliver, Derek R.
AU - Lewis, Nathan S
AU - Freund, Michael S.
PY - 2015/12/16
Y1 - 2015/12/16
N2 - 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.
AB - 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.
KW - artificial photosynthesis
KW - electrical characteristics
KW - microwires
KW - PEDOT:PSS
KW - silicon
KW - surface functionalization
UR - http://www.scopus.com/inward/record.url?scp=84950246953&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84950246953&partnerID=8YFLogxK
U2 - 10.1021/acsami.5b07725
DO - 10.1021/acsami.5b07725
M3 - Article
VL - 7
SP - 27160
EP - 27166
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
SN - 1944-8244
IS - 49
ER -