A CdTe/PbTe heterojunction (HJ) yields two-dimensional electron gas (2DEG) with a high electron density and mobility. Ultrahigh-speed and room-temperature operating mid-infrared photodetectors are developed with the 2DEG. The photoresponse of the detectors originates from the intrinsic response of PbTe by virtue of the conduction-band and valence-band alignment of the HJ. The extremely short rise and decay photoresponse time demonstrate a major advantage of the 2DEG. At λ=3.0μm \lambda = {3.0}\,\, \mu \text{m} and a bias voltage of 100 mV, the responsivity and detectivity reach 0.94 A/W and 2×1010{2} \times {10}^{{10}} Jones, respectively. The excellent performance of the detectors renders promising applications in novel mid-infrared frequency detection systems.

中文翻译：

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CdTe/PbTe 异质结中具有二维电子气的超高速中红外光电探测器


CdTe/PbTe 异质结 (HJ) 产生具有高电子密度和迁移率的二维电子气 (2DEG)。超高速和室温操作的中红外光电探测器是用 2DEG 开发的。探测器的光响应源自 PbTe 凭借 HJ 的导带和价带排列的本征响应。极短的上升和衰减光响应时间证明了 2DEG 的主要优势。在 λ=3.0μm \lambda = {3.0}\,\, \mu \text{m} 和 100 mV 偏置电压下，响应度和探测度达到 0.94 A/W 和 2×1010{2} \times {10分别是}^{{10}}琼斯。探测器的优异性能在新型中红外频率探测系统中具有广阔的应用前景。