Printed assemblies of GaAs photoelectrodes with decoupled optical and reactive interfaces for unassisted solar water splitting
Printed assemblies of GaAs photoelectrodes with decoupled optical and reactive interfaces for unassisted solar water splitting
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DOI：
10.1038/nenergy.2017.43
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发表时间：
2017-05-01
期刊：
影响因子：
56.7
通讯作者：
Yoon, Jongseung
中科院分区：
文献类型：
--
作者：
Kang, Dongseok;Young, James L.;Yoon, Jongseung
尽管III-V族化合物半导体具有优异的光物理性质和创纪录的太阳能-氢转化效率，但其高成本和有限的稳定性阻碍了其在太阳能驱动的光电化学水分解中的实际应用。在这里，我们提出了一种III-V族外延生长的化合物半导体的印刷组件，可以绕过这些困难的战略。从生长晶片释放GaAs基外延材料的薄膜叠层，并将其印刷到非天然透明衬底上，以形成用于太阳能制氢的集成光催化电极。异质集成的电极配置与专门的外延设计一起用于解耦用于照明和电催化的材料界面。随后，这允许光吸收、载流子传输、电荷转移和材料稳定性的独立控制和优化。使用这种方法，我们构建了一个串联连接的无线串联系统的GaAs光电极，并证明了13.1%的太阳能到氢的转换效率的无辅助模式的水分裂。
Despite their excellent photophysical properties and record-high solar-to-hydrogen conversion efficiency, the high cost and limited stability of III-V compound semiconductors prohibit their practical application in solar-driven photoelectrochemical water splitting. Here we present a strategy for III-V photocatalysis that can circumvent these difficulties via printed assemblies of epitaxially grown compound semiconductors. A thin film stack of GaAs-based epitaxial materials is released from the growth wafer and printed onto a non-native transparent substrate to form an integrated photocatalytic electrode for solar hydrogen generation. The heterogeneously integrated electrode configuration together with specialized epitaxial design serve to decouple the material interfaces for illumination and electrocatalysis. Subsequently, this allows independent control and optimization of light absorption, carrier transport, charge transfer, and material stability. Using this approach, we construct a series-connected wireless tandem system of GaAs photoelectrodes and demonstrate 13.1% solar-to-hydrogen conversion efficiency of unassisted-mode water splitting.