AI Article Synopsis
- Researchers explored CuBaSnSSe films, made from abundant metals, for use as photocathodes.
- The films were created with varying selenium (Se) content and showed changes in crystal structure and band gap, decreasing from 2.0 to 1.6 eV with increased Se.
- The highest photocurrent of over 6 mA/cm was achieved with Pt/CuBaSnSSe films containing 60% Se at -0.4 V, compared to about 3 mA/cm for bare CuBaSnSSe films with the same Se content.
Article Abstract
CuBaSnSSe films consisting of earth-abundant metals have been examined for photocathode application. Films with different Se contents (i.e., CuBaSnSSe with x ≤ 2.4) were synthesized using a cosputter system with post-deposition sulfurization/selenization annealing treatments. Each film adopts a trigonal P3 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 CuBaSnS. Given the suitable bandgap and earth-abundant elements, the CuBaSnSSe films were studied as prospective photocathodes for water splitting. Greater than 6 mA/cm was obtained under illumination at -0.4 V versus reversible hydrogen electrode for Pt/CuBaSnSSe films with ∼60% Se content (i.e., x = 2.4), whereas a bare CuBaSnSSe (x = 2.4) film yielded ∼3 mA/cm at -0.4 V/RHE.
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| http://dx.doi.org/10.1021/acs.jpclett.6b02010 | DOI Listing |
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