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Issue 48, 2016
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Earth-abundant trigonal BaCu2Sn(SexS1−x)4 (x = 0–0.55) thin films with tunable band gaps for solar water splitting

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Abstract

Photoelectrochemical (PEC) solar devices can convert abundant solar energy directly into storable, clean hydrogen fuel. Here, earth-abundant thin-film solid solutions, BaCu2Sn(SexS1−x)4 (x = 0–0.55), demonstrated promise as low-cost absorber materials in efficient PEC solar devices. These p-type compounds crystallize in a trigonal structure and exhibit tunable band gaps of 1.67–2.05 eV for the composition x = Se/(Se + S). The photocathode based on the pure sulfide (x = 0) shows a photocurrent of ∼5 mA cm−2 saturated at −0.35 V vs. reversible hydrogen electrode (RHE) from a neutral electrolyte. Adding selenium decreases alloy band gaps and extends the absorption range of the solar spectrum, which increases the saturated photocurrent to ∼11 mA cm−2 at −0.55 V vs. RHE.

Graphical abstract: Earth-abundant trigonal BaCu2Sn(SexS1−x)4 (x = 0–0.55) thin films with tunable band gaps for solar water splitting

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Publication details

The article was received on 05 Aug 2016, accepted on 30 Aug 2016 and first published on 23 Nov 2016


Article type: Paper
DOI: 10.1039/C6TA06702F
Citation: J. Mater. Chem. A, 2016,4, 18885-18891

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    Earth-abundant trigonal BaCu2Sn(SexS1−x)4 (x = 0–0.55) thin films with tunable band gaps for solar water splitting

    J. Ge, Y. Yu and Y. Yan, J. Mater. Chem. A, 2016, 4, 18885
    DOI: 10.1039/C6TA06702F

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