A Noble‐Transition Alloy Excels at Hot‐Carrier Generation in the Near Infrared
A Noble‐Transition Alloy Excels at Hot‐Carrier Generation in the Near Infrared
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DOI：
10.1002/adma.201906478
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发表时间：
2020-04
影响因子：
29.4
通讯作者：
Sara K F Stofela;O. Kizilkaya;B. Diroll;T. R. Leite;Mohammad M. Taheri;Daniel E. Willis;J. B. Baxter;W. Shelton;P. Sprunger;K. McPeak
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文献类型：
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作者：
Sara K F Stofela;O. Kizilkaya;B. Diroll;T. R. Leite;Mohammad M. Taheri;Daniel E. Willis;J. B. Baxter;W. Shelton;P. Sprunger;K. McPeak
在金属中产生高于平衡的“热”载流子是一条将光子转化为电荷的有效近红外光电子学的有前途的途径。然而，同时在近红外产生热载流子和足够长载流子寿命的金属仍然是难以捉摸的。与纯金属相比，合金可以提供新的特性和新的设计策略。结果表明，贵金属过渡合金AuxPd1-−-x在近红外激发时，在热载流子的产生和寿命方面优于其成分金属。在光纤波长(例如，1550 nm)下，与Au相比，Au50Pd50提供的≈0.8 eV热空穴数量增加了20倍，与PD相比，载流子寿命增加了三倍。贵金属过渡合金在热载流子产生方面的优势，为近红外光电子器件提供了一个新的材料平台。
Above‐equilibrium “hot”‐carrier generation in metals is a promising route to convert photons into electrical charge for efficient near‐infrared optoelectronics. However, metals that offer both hot‐carrier generation in the near‐infrared and sufficient carrier lifetimes remain elusive. Alloys can offer emergent properties and new design strategies compared to pure metals. Here, it is shown that a noble‐transition alloy, AuxPd1−x, outperforms its constituent metals concerning generation and lifetime of hot carriers when excited in the near‐infrared. At optical fiber wavelengths (e.g., 1550 nm), Au50Pd50 provides a 20‐fold increase in the number of ≈0.8 eV hot holes, compared to Au, and a threefold increase in the carrier lifetime, compared to Pd. The discovery that noble‐transition alloys can excel at hot‐carrier generation reveals a new material platform for near‐infrared optoelectronic devices.