K. Choi, S. Allen, Y. Wei, J. Sun, K. Olver, R. Fu
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引用次数: 2
摘要
我们正在开发用于长波应用的谐振腔qwip。将间距为25 μm的探测器像素杂交到扇出电路中进行辐射测量。适量掺杂0.5 x 1018 cm-3，在1.3 μm厚的活性材料中实现了37%的量子效率和15%的转换效率，在0.6 μm厚的活性材料中实现了35%的QE和21%的CE。两个探测器在10.5 μm处截止，带宽为2 μm。在F/2光学条件下，光电流等于暗电流时的温度约为65k。由于QWIP材料层的非线性电位下降，较厚的探测器显示出较大的QE极性不对称性。
We are developing resonator-QWIPs for long wavelength applications. Detector pixels with 25 μm pitch were hybridized to fanout circuits for radiometric measurements. With a moderate doping of 0.5 x 1018 cm-3, we achieved a quantum efficiency of 37% and conversion efficiency of 15% in a 1.3 μm-thick active material and 35% QE and 21% CE in a 0.6 μm-thick active material. Both detectors are cutoff at 10.5 μm with a 2 μm bandwidth. The temperature at which photocurrent equals dark current is about 65 K under F/2 optics. The thicker detector shows a large QE polarity asymmetry due to nonlinear potential drop in the QWIP material layers.
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