Tunable 2D Group‐III Metal Alloys
Tunable 2D Group‐III Metal Alloys
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DOI：
10.1002/adma.202104265
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发表时间：
2021-09
影响因子：
29.4
通讯作者：
S. Rajabpour;Alexander Vera;Wen He;Boris Katz;R. Koch;Margaux Lassaunière;Xuegang Chen;Cequn Li;Katharina Nisi;Hesham M El-Sherif;Maxwell T. Wetherington;C. Dong;A. Bostwick;C. Jozwiak;A. V. van Duin;N. Bassim;Jun Zhu;Gwo-Ching Wang;U. Wurstbauer;E. Rotenberg;V. Crespi;S. Y. Quek;J. Robinson
中科院分区：
文献类型：
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作者：
S. Rajabpour;Alexander Vera;Wen He;Boris Katz;R. Koch;Margaux Lassaunière;Xuegang Chen;Cequn Li;Katharina Nisi;Hesham M El-Sherif;Maxwell T. Wetherington;C. Dong;A. Bostwick;C. Jozwiak;A. V. van Duin;N. Bassim;Jun Zhu;Gwo-Ching Wang;U. Wurstbauer;E. Rotenberg;V. Crespi;S. Y. Quek;J. Robinson
化学稳定的量子约束二维金属是下一代纳米级量子器件的研究热点。这种金属的自底向上设计和合成可以创造出具有定制的、按需的、电子和光学特性的材料，用于利用可调谐等离子体耦合、光学非线性、epsilon近零行为或波长特定的光捕获。在这项工作中，证明了空气稳定二维金属的电子、超导和光学性质可以通过合金的形成来可控地调节。采用约束异质外延法（CHet）合成了环境坚固的大面积2D - InxGa1−x合金。在没有相偏析的情况下，实现了接近完全的固溶性，并且通过改变前驱体的相对元素组成，可以在整个x范围内调节组成。其光学和电子性质与合金成分直接相关，其中介电功能、能带结构、超导性以及从金属到石墨烯的电荷转移都由二维金属层中的铟/镓比控制。
Chemically stable quantum‐confined 2D metals are of interest in next‐generation nanoscale quantum devices. Bottom‐up design and synthesis of such metals could enable the creation of materials with tailored, on‐demand, electronic and optical properties for applications that utilize tunable plasmonic coupling, optical nonlinearity, epsilon‐near‐zero behavior, or wavelength‐specific light trapping. In this work, it is demonstrated that the electronic, superconducting, and optical properties of air‐stable 2D metals can be controllably tuned by the formation of alloys. Environmentally robust large‐area 2D‐InxGa1−x alloys are synthesized byConfinement Heteroepitaxy (CHet). Near‐complete solid solubility is achieved with no evidence of phase segregation, and the composition is tunable over the full range of x by changing the relative elemental composition of the precursor. The optical and electronic properties directly correlate with alloy composition, wherein the dielectric function, band structure, superconductivity, and charge transfer from the metal to graphene are all controlled by the indium/gallium ratio in the 2D metal layer.