Ultra-low-threshold field emission from conjugated polymers
Ultra-low-threshold field emission from conjugated polymers
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DOI：
10.1038/26444
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发表时间：
1998-09
期刊：
影响因子：
64.8
通讯作者：
N. Boctor;G. D. Cody;Benjamin A. Cooper;R. Hazen;Hatten S. Yoder
中科院分区：
文献类型：
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作者：
N. Boctor;G. D. Cody;Benjamin A. Cooper;R. Hazen;Hatten S. Yoder
场致发射显示器包含当充电到低（负）电位时发射电子的材料;电子激发荧光屏的光发射。这些器件具有以低功耗和低成本提供具有良好图像质量的平板视觉显示器的潜力。目前，场致发射装置使用微加工尖端阵列作为发射阴极，但一种潜在的更便宜和更简单的替代方案是使用薄膜阴极。这就需要确定在低电场下能发射出可观的电子流的材料。氮掺杂的化学气相沉积金刚石膜和非晶碳膜已被探索用于这一目的。一些导电有机聚合物的低电子亲合势、宽禁带和优异的输运性质表明它们也可能提供良好的阴极材料。在这里，我们证明，这是如此，报告从薄膜的regioregular聚（3-辛基噻吩）沉积在n-掺杂硅，铟锡氧化物作为阳极的场发射。我们从这些薄膜中测量的电子发射阈值场是迄今为止报道的任何碳基材料的最低阈值场。
Field-emission displays contain materials that emit electrons when charged to a low (negative) potential; the electrons excite light emission from phosphor screens. These devices have the potential to provide flat-panel visual displays with good picture quality at low power consumption and low cost. Field-emission devices at present use arrays of microfabricated tips as the emitting cathodes, but a potentially cheaper and simpler alternative is to use a thin-film cathode. This requires the identification of materials that will emit an appreciable electron current at low applied fields. Nitrogen-doped, chemical-vapour-deposited diamond films and amorphous carbon films have been explored for this purpose. The low electron affinity, wide bandgap and excellent transport properties of some conducting organic polymers suggest that they might also provide good cathode materials. Here we demonstrate that this is so, reporting field emission from thin films of regioregular poly(3-octylthiophene) deposited on n-doped silicon, with indium tin oxide as the anode. The threshold fields that we measure for electron emission from these films are the lowest yet reported for any carbon-based material.