Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 7, Issue 22, Pages 4554-4561Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.6b02010
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Funding
- National Science Foundation [1511737]
- Duke University Energy Initiative Research Seed Fund
- National Science Foundation, National Nanotechnology Coordinated Infrastructure (NNCI) [ECCS-1542015]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1511737] Funding Source: National Science Foundation
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Cu2BaSnS4-xSex films consisting of earth-abundant metals have been examined for photocathode application. Films with different Se contents (i.e., Cu2BaSnS4-xSex with x <= 2.4) were synthesized using a cosputter system with post-deposition sulfurization/selenization annealing treatments. Each film adopts a trigonal P31 crystal structure, with progressively larger lattice constants and with band gaps shifting from 2.0 to 1.6 eV, as more Se substitutes for S in the parent compound Cu2BaSnS4. Given the suitable bandgap and earth-abundant elements, the Cu2BaSnS4-xSex films were studied as prospective photocathodes for water splitting. Greater than 6 mA/cm(2) was obtained under illumination at -0.4 V versus reversible hydrogen electrode for Pt/Cu2BaSnS4-xSex films with similar to 60% Se content (i.e., x = 2.4), whereas a bare Cu2BaSnS4-xSex (x = 2.4) film yielded similar to 3 mA/cm(2) at -0.4 V/RHE.
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