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发表刊物：
Eighth Symposium on Novel Photoelectronic Detection Technology and Applications
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关键字：
Photodetector, Double heterostructure, AlGaInP, High speed
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是否译文：
否
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发表时间：
2022-03-01
摘要：
The quaternary alloy (AlxGa1-x)y
In1-yP is an attractive material due to its bandgap tunability while being lattice-matched
to GaAs. Although this direct gap quaternary material is being extensively used for the visible lasers and LEDs due to its
unique light absorption/emission properties, the applications in visible photodetectors remain unexplored. In some specific
applications, such as doppler velocimetry and thermohaline sensors for sea water, and plastic fiber optic databus in the
cars, visible light band is preferred. In order to meet the requirements of low cost and small size, a monolithically
integrated laser and detector system is desired. In this paper, A symmetric mesa AlInP/AlGaInP/AlInP doubleheterostructure visible photodetectors has been optimally designed based on the quaternary alloy. The composition
of (AlxGa1-x)y
In1-yP was simulated based on energy band discontinuity theory, giving the values of y=0.48 and x=0.46.
By using the first-order approximate data processing method and analogy with other III-V main group quaternary alloy
compounds, the simulated values of bandwidth and responsivity are obtained to be 10 GHz and 0.85 A/W at wavelength
560 nm, respectively. Meanwhile, the doping concentration and thickness are optimized by analyzing the influence of
doping concentration and thickness of each layer on bandwidth and responsivity. Through optimization, the optimal doping
concentration and thickness are about 2×1018cm-3 and 0.5μm of P layer, 5×1015cm-3 and 1μm of absorption layer,
5×1017cm-3 and 0.5μm of N layer , the detectivity of the visible photodetector is 109
cm√HzW-1 and the noise
equivalent power of the visible photodetector is 10-12W. With high responsivity, high speed, and large bandwidth, the
designed photodetector would have good application prospect.
