Researchers applied precursor seed layer engineering to prepare Cu2ZnSnS4 light-absorbing films using the solution-processed spin-coating method.
Researchers from China have developed a method that delivers the highest solar-to-hydrogen conversion efficiency in copper zinc tin sulfide photocathodes. This material offers excellent capability for a photocathode, but so far, its performance has been limited by suboptimal bulk and interfacial charge carrier dynamics.
In the latest study, researchers explored a facile and versatile CZTS precursor seed layer engineering technique to enhance the material’s performance. They found that the PSLE shatters the performance ceiling of earth-abundant Cu2ZnSnS4 photocathodes, delivering a record half-cell solar-to-hydrogen efficiency of 9.91 %.Precursor seed layer engineeringIt also enables the first unbiased CZTS-BiVO4 tandem cell to achieve 2.20% STH in natural seawater. While conventional CZTS devices stall below 8 % solar-to-hydrogen efficiency because bulk Cu_Zn antisites and interface traps devour carriers.Researchers applied precursor seed layer engineering to prepare Cu2ZnSnS4 light-absorbing films using the solution-processed spin-coating method.They highlighted that the method significantly enhances crystal growth and mitigates detrimental defects in the post-sulfurized CZTS light-absorbing films. This effective optimization of defects and charge carrier dynamics results in a highly efficient CZTS/CdS/TiO2/Pt thin-film photocathode.PSLE-controlled nucleation enhances efficiency“PSLE-controlled nucleation creates dense, vertically aligned grains, slashes defect density to 9.88 × 1015 cm-3, lengthens minority-carrier lifetime to 4.40 ns and drives photocurrent to an unprecedented 29.44 mA cm-2 at 0 V vs RHE—within 3 % of the theoretical 30.49 mA cm-2 limit,” said researchers from Shenzhen University in a statement.The method can help reduce the dependence on fossil fuels, which are non-renewable and bad for the environment. Future energy shortages are expected to be eased by hydrogen energy, a new, environmentally friendly green energy source.At a time when governments race to achieve their net zero goals, most o the current methods still produce hydrogen using a significant amount of electricity and cause CO2 emissions. This shows an urgent need for cleaner approaches such as solar-to-hydrogen conversion via photoelectrochemical water splitting, according to researchers.They underlined that it has been widely believed that PEC water splitting using sunlight irradiation is a clean way to produce hydrogen energy.Finely tuned PSLE strategyPublished in Nano-Micro Letters, the study reveals that the finely tuned PSLE strategy led to the synthesis of a high-quality CZTS characterized by large, compact, uniform, and vertically aligned grains.“Planar-type photocathodes comprising Mo/CZTS/CdS/TiO2/Pt were fabricated and examined. The optimized CZTS films exhibited reduced passivation of bulk and interfacial defects, resulting in a superior CZTS/CdS heterojunction characterized by a higher built-in voltage and lower defect density at the interface,” said researchers in the study.Researchers also leveraged only earth-abundant Cu, Zn, Sn, and S, PSLE-enabled CZTS photocathodes cut material costs by >70 % versus In/Ga-based chalcogenides, require no rare co-catalysts, and are compatible with roll-to-roll coating. The strategy opens a direct, gigawatt-scale pathway to low-cost green hydrogen produced directly from seawater, positioning CZTS as the keystone for sustainable solar fuels and circular hydrogen economies.
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