Island size effects in nanoparticle-enhanced photodetectors
Island size effects in nanoparticle-enhanced photodetectors
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DOI：
10.1063/1.122903
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发表时间：
1998-12
影响因子：
4
通讯作者：
H. Stuart;D. Hall
中科院分区：
文献类型：
--
作者：
H. Stuart;D. Hall
我们报道了金属岛尺寸变化对纳米粒子增强光电探测器的影响。通过改变用于制备金属岛状薄膜的沉积和热处理条件来控制纳米颗粒的尺寸。增大165 nm厚的绝缘体上硅(SOI)光电探测器上制备的银岛粒子的尺寸会导致观察到的光电流急剧增加。对于波长为800 nm的光，观察到了近20倍的光电流增强，这比以前报道的结果有了显著的改善。这一改进与两个物理效应有关：较大的纳米粒子的散射效率增加，以及由于与SOI波导模的辐射耦合，金属岛膜的共振特性发生了质的变化。
We report the effect of metal-island size variation in nanoparticle-enhanced photodetectors. Nanoparticle size was controlled by varying the deposition and annealing conditions used to produce the metal-island films. Increasing the size of silver-island particles fabricated onto 165 nm thick silicon-on-insulator (SOI) photodetectors resulted in a dramatic increase in the observed photocurrent. A nearly factor-of-20 photocurrent enhancement was observed for light of wavelength 800 nm, a significant improvement over previously reported results. The improvement is linked to two physical effects: the increased scattering efficiency of the larger nanoparticles and a qualitative change in the resonance characteristics of the metal-island film due to radiative coupling to the SOI waveguide modes.