Chemical Control of Correlated Metals as Transparent Conductors
Chemical Control of Correlated Metals as Transparent Conductors
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DOI：
10.1002/adfm.201808609
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发表时间：
2019-03-14
影响因子：
19
通讯作者：
Alaria, Jonathan
中科院分区：
文献类型：
--
作者：
Stoner, Jessica L.;Murgatroyd, Philip A. E.;Alaria, Jonathan
相关的金属过渡金属氧化物提供了一条通往薄膜透明导体的途径，该途径与宽带宽禁带半导体的简并掺杂不同。在相关金属透明导体中，电子间排斥将等离子体频率移出可见光区域以增强光传输，而金属的高载流子密度保持足够的导电性。通过利用对ABO（3）钙钛矿氧化物膜中源自B位过渡金属的能带的填充、位置和宽度的控制，表明基于第二过渡系列阳离子4d（2）Mo 4+的立方SrMoO 3和正交CaMoO 3的脉冲激光沉积生长膜具有上级基于第一过渡系列3d（1）V 4+的SrVO 3的透明导体性质。由在掺杂物中的更大的能带填充提供的增加的载流子浓度提供更高的电导率，同时保持足够的相关性以保持等离子体边缘低于可见光区域。第二过渡系列材料中n=4前线轨道的结合能降低，将氧化物2p到金属nd跃迁的能量转移到近紫外，以增强可见光透明度。CaMoO3中MoO6八面体的A位尺寸驱动旋转优化了透明导体性能的等离子体频率和电导率之间的平衡。
Correlated metallic transition metal oxides offer a route to thin film transparent conductors that is distinct from the degenerate doping of broadband wide gap semiconductors. In a correlated metal transparent conductor, interelectron repulsion shifts the plasma frequency out of the visible region to enhance optical transmission, while the high carrier density of a metal retains sufficient conductivity. By exploiting control of the filling, position, and width of the bands derived from the B site transition metal in ABO(3) perovskite oxide films, it is shown that pulsed laser deposition-grown films of cubic SrMoO3 and orthorhombic CaMoO3 based on the second transition series cation 4d(2) Mo4+ have superior transparent conductor properties to those of the first transition series 3d(1) V4+-based SrVO3. The increased carrier concentration offered by the greater bandfilling in the molybdates gives higher conductivity while retaining sufficient correlation to keep the plasma edge below the visible region. The reduced binding energy of the n=4 frontier orbitals in the second transition series materials shifts the energies of oxide 2p to metal nd transitions into the near-ultraviolet to enhance visible transparency. The A site size-driven rotation of MoO6 octahedra in CaMoO3 optimizes the balance between plasma frequency and conductivity for transparent conductor performance.