Solar water splitting directly converts solar energy into H₂ fuel that is suitable for storage and transport. To achieve a high solar-to-hydrogen (STH) conversion efficiency, elaborate strategies yielding a high photocurrent in a tandem configuration along with sufficient photovoltage should be developed. We demonstrated highly efficient solar water splitting devices based on emerging low-cost Sb₂Se₃ photocathodes coupled with semitransparent perovskite photovoltaics. A state-of-the-art Sb₂Se₃ photocathode exhibiting efficient long-wavelength photon harvesting enabled by judicious selection of junction layers was employed as a bottom absorber component. The top semitransparent photovoltaic cells, i.e., parallelized nanopillar perovskites using an anodized aluminum oxide scaffold, allowed the transmittance, photocurrent, and photovoltage to be precisely adjusted by changing the filling level of the perovskite layer in the scaffold. The optimum tandem device, in which similar current values were allocated to the top and bottom cells, achieved an STH conversion efficiency exceeding 10% by efficiently utilizing a broad range of photons at wavelength over 1000 nm.

中文翻译：

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通过低成本的Sb2Se3光电阴极与半透明钙钛矿光伏电池结合，太阳能分解效率超过10％

太阳能分水器将太阳能直接转换为适合存储和运输的H ₂燃料。为了实现高的太阳能到氢（STH）转换效率，应该开发出精心设计的策略，以串联配置的方式产生高光电流以及足够的光电压。我们展示了基于新兴的低成本Sb ₂ Se ₃光电阴极和半透明钙钛矿光伏电池的高效太阳能分水装置。通过明智地选择接合层而表现出有效的长波长光子收集的最先进的Sb ₂ Se ₃光电阴极被用作底部吸收剂组分。顶部的半透明光伏电池即，使用阳极氧化铝支架将纳米柱状钙钛矿平行化，可以通过改变支架中钙钛矿层的填充水平来精确调节透射率，光电流和光电压。最佳串联装置，其中相似的电流值分配给顶部和底部电池，通过有效利用波长超过1000 nm的宽范围光子，实现了超过10％的STH转换效率。