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김광수

Kim, Kwang S.
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Antimony(III) Sulfide Thin Films as a Photoanode Material in Photocatalytic Water Splitting

Author(s)
DeAngelis, Alexander DanielKemp, Kingsley ChristianGaillard, NicolasKim, Kwang S.
Issued Date
2016-04
DOI
10.1021/acsami.5b12178
URI
https://scholarworks.unist.ac.kr/handle/201301/19082
Fulltext
http://pubs.acs.org/doi/abs/10.1021/acsami.5b12178
Citation
ACS APPLIED MATERIALS & INTERFACES, v.8, no.13, pp.8445 - 8451
Abstract
For the first time, we present exploratory investigations on the performance of thermally evaporated Sb2S3 thin film photoanodes for solar assisted water-splitting applications. With a band gap of 1.72 eV, a 250 nm thick Sb2S3 photoanode showed a saturation photocurrent density of similar to 600 mu A cm(-2) measured at 1.0 V reversible hydrogen electrode (RHE) in 0.1 M Na2SO4 under 1-sun illumination, with an onset potential of similar to 0.25 V RHE. However, subsequent photodegradation studies revealed that the material dissolves relatively quickly with the application of both illumination and bias. Nonetheless, Sb2S3 does have the advantage of having a relatively low optimal fabrication temperature of 300 degrees C and thus may have utility as a top cell absorber of a tandem device where the bottom cell is temperature sensitive, if protected from corrosion. Therefore, we characterized relevant aspects of the material in an attempt to explain the large difference between the theoretical maximum and measured current density. From our characterization it is believed that the photocatalytic efficiency of this material can be improved by modifying the surface to reduce optical reflection and addressing inherent issues such as high electrical resistivity and surface defects.
Publisher
AMER CHEMICAL SOC
ISSN
1944-8244
Keyword (Author)
water splittingantimony sulfidephotocatalyticthin filmPEC
Keyword
CONVERSION EFFICIENCYOPTICAL-PROPERTIESDEPOSITED SB2S3SOLAR-CELLSHYDROGENPHOTOELECTROLYSISPHOTOCATHODEELECTRODESREDUCTIONSTABILITY

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