title: Synthesis and Characterization of an Earth-Abundant Cu2BaSn(S,Se)4Chalcogenide for Photoelectrochemical Cell Application.
abstract: Cu2BaSnS4-xSexfilms consisting of earth-abundant metals have been examined for photocathode application. Films with different Se contents (i.e., Cu2BaSnS4-xSexwith x ≤ 2.4) were synthesized using a cosputter system with post-deposition sulfurization/selenization annealing treatments. Each film adopts a trigonal P31crystal 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-xSexfilms were studied as prospective photocathodes for water splitting. Greater than 6 mA/cm2was obtained under illumination at -0.4 V versus reversible hydrogen electrode for Pt/Cu2BaSnS4-xSexfilms with ∼60% Se content (i.e., x = 2.4), whereas a bare Cu2BaSnS4-xSex(x = 2.4) film yielded ∼3 mA/cm2at -0.4 V/RHE.
authors: Department of Mechanical Engineering and Materials Science, Duke University , Durham, North Carolina 27708, United States.|Department of Chemistry, Duke University , Durham, North Carolina 27708, United States.
authors: Donghyeop
authors: D
authors: Shin
authors: Department of Electrical & Computer Engineering, Duke University , Durham, North Carolina 27708, United States.
authors: Edgard
authors: E
authors: Ngaboyamahina
authors: Department of Mechanical Engineering and Materials Science, Duke University , Durham, North Carolina 27708, United States.
authors: Yihao
authors: Y
authors: Zhou
authors: Department of Mechanical Engineering and Materials Science, Duke University , Durham, North Carolina 27708, United States.|Department of Electrical & Computer Engineering, Duke University , Durham, North Carolina 27708, United States.
authors: Jeffrey T
authors: JT
authors: Glass
authors: Department of Mechanical Engineering and Materials Science, Duke University , Durham, North Carolina 27708, United States.|Department of Chemistry, Duke University , Durham, North Carolina 27708, United States.
authors: David B
authors: DB
authors: Mitzi