当前位置: X-MOL 学术IEEE J. Quantum Elect. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Nature Allows High Sensitivity Thermal Imaging With Type-I Quantum Wells Without Optical Couplers: A Grating-Free Quantum Well Infrared Photodetector With High Conversion Efficiency
IEEE Journal of Quantum Electronics ( IF 2.5 ) Pub Date : 2021-04-01 , DOI: 10.1109/jqe.2021.3052188
Cengiz Besikci

Quantum well infrared photodetectors (QWIPs) have facilitated thermal imagers with excellent pixel operability, uniformity and stability. The main disadvantage of the standard QWIP technology is the low conversion efficiency (CE) as a result of weak quantum efficiency (QE) and photoconductive gain inhibiting the utilization of the sensor for low background and/or high frame rate applications. The other problem is the requirement of an optical grating which loses its efficiency with decreasing pixel pitch, as well as limiting the performance of dual-band focal plane array (FPA) due to the wavelength dependence of the diffraction-grating coupling efficiency. The author reports a grating-free 15 $\mu \text{m}$ pixel pitch $640\times 512$ mid-wavelength infrared (MWIR) QWIP FPA constructed with the InP/GaInP/In0.83Ga0.17 As material system with normal incident radiation absorption ability. The pixels yielded peak QE, CE and specific detectivity of 23%, ~40% and $1\times 10 ^{11}$ cmHz1/2/W (at ~80 K with f/2 optics) in spite of the absence of diffraction grating, substantially high cut-off wavelength (5.8 $\mu \text{m}$ ) and broad spectral response ( $\Delta \lambda /\lambda _{\mathbf {p}}=31$ %). Together with excellent (uncorrected) responsivity and noise equivalent temperature difference nonuniformities of 5.9% and 17%, the results illustrate tremendous improvement over the performance of the conventional MWIR QWIP FPA exhibiting great potential to revive the QWIP technology especially in dual-band imaging.

中文翻译:

Nature 允许使用没有光耦合器的 I 型量子阱进行高灵敏度热成像:具有高转换效率的无光栅量子阱红外光电探测器

量子阱红外光电探测器 (QWIP) 使热成像仪具有出色的像素可操作性、均匀性和稳定性。标准 QWIP 技术的主要缺点是转换效率 (CE) 低,这是由于弱量子效率 (QE) 和光电导增益抑制了传感器在低背景和/或高帧速率应用中的利用。另一个问题是要求光栅随着像素间距的减小而降低其效率,并且由于衍射光栅耦合效率的波长依赖性而限制了双波段焦平面阵列 (FPA) 的性能。作者报告了一个无光栅15 $\mu \text{m}$ 像素间距 640 美元\乘以 512 美元 中波长红外 (MWIR) QWIP FPA 由具有法向入射辐射吸收能力的 InP/GaInP/In 0.83 Ga 0.17 As 材料系统构成。像素产生峰值 QE、CE 和 23%、~40% 和 $1\times 10 ^{11}$ cmHz 1/2 /W(在 ~80 K 时使用 f/2 光学器件)尽管没有衍射光栅,但截止波长相当高(5.8 $\mu \text{m}$ ) 和宽光谱响应 ( $\Delta \lambda /\lambda _{\mathbf {p}}=31$ %)。加上出色的(未校正的)响应率和 5.9% 和 17% 的噪声等效温差不均匀性,结果表明与传统 MWIR QWIP FPA 的性能相比有了巨大的改进,显示出复兴 QWIP 技术的巨大潜力,尤其是在双波段成像中。
更新日期:2021-04-01
down
wechat
bug