Enhanced spectral response of an AlGaN-based solar-blind ultraviolet photodetector with Al nanoparticles
Enhanced spectral response of an AlGaN-based solar-blind ultraviolet photodetector with Al nanoparticles
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具有 Al 纳米颗粒的 AlGaN 基日盲紫外光电探测器的增强光谱响应
DOI：
10.1364/oe.22.024286
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发表时间：
2014-10-06
期刊：
影响因子：
3.8
通讯作者：
Zhang, Zhiwei
中科院分区：
文献类型：
--
作者：
Bao, Guanghong;Li, Dabing;Zhang, Zhiwei
利用20-60 nm的铝纳米粒子(NPs)实现了AlGaN基日盲紫外(SB-UV)探测器的光谱响应增强。在5V偏压下，含60 nm纳米Al纳米粒子的探测器的峰值响应率(约288 nm)是不含Al纳米粒子的探测器的两倍多，达到0.288 A/W。为了确定Al纳米粒子的增强机制，用时频域有限元方法对其消光光谱进行了模拟。计算结果表明，Al纳米粒子的偶极表面等离子体共振波长集中在AlGaN基Sb-UV探测器的峰值响应度位置附近。因此，探测器的改进可以归因于Al纳米粒子的局域表面等离子体共振效应。局域电场增强和相关的散射效应导致产生更多的电子-空穴对，从而产生更高的响应率。另外，沉积Al纳米颗粒后，AlGaN基Sb-UV探测器的暗电流没有增大。研究结果对AlGaN基Sb-UV探测器的应用具有一定的参考价值。(C)2014年美国光学学会
An enhanced spectral response was realized in an AlGaN-based solar-blind ultraviolet (SB-UV) detector using aluminum (Al) nanoparticles (NPs) of 20-60 nm. The peak responsivity of the detector (about 288 nm) with 60 nm Al NPs is more than two times greater than that of a detector without Al NPs under a 5-V bias, reaching 0.288 A/W. To confirm the enhancement mechanism of the Al NPs, extinction spectra were simulated using time-domain and frequency-domain finite-element methods. The calculation results show that the dipole surface plasmon resonance wavelength of the Al NPs is localized near the peak responsivity position of AlGaN-based SB-UV detectors. Thus, the improvement in the detectors can be ascribed to the localized surface plasmon resonance effect of the Al NPs. The localized electric field enhancement and related scattering effect result in the generation of more electron-hole pairs and thus a higher responsivity. In addition, the dark current of AlGaN-based SB-UV detectors does not increase after the deposition of Al nanoparticles. The results presented here is promising for applications of AlGaN-based SB-UV detectors. (C)2014 Optical Society of America