Ultra-sensitive current bistability and light switching in a resonant tunneling superlattice transistor

Raman Kumar, Robert B. Kaufman, F. Hsiao, J. Leburton, J. Dallesasse
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Abstract

Bistability in the current–voltage characteristics of semiconductor superlattices and quantum cascade laser structures has the potential for wide-ranging applications, particularly in sensing systems. However, the interdependency of applied bias and current injection in conventional two-terminal structures has led to complications in analysis and rendered the bistability phenomenon difficult to implement in practical applications. Here, we report a new kind of electronic bistability coupled to optical switching in a resonant tunneling bipolar superlattice transistor. This bistability manifests as sharp discontinuities in the collector current with extremely small variations of the applied voltage, which arise from unstable tunneling transmission across the hetero-barrier between the two-dimensional electron gas (2DEG) at the edge of the transistor base and the collector superlattice structure. The electronic transitions between high and low quantum mechanical transmissions are demonstrated to be caused by self-consistent variations of the internal electric field at the heterointerface between the 2DEG and the superlattice. They are also present in the base current of the three-terminal device and result in sharp switching of near-infrared spontaneous light emission output from an interband radiative recombination process with a peak emission wavelength of 1.58 μm. A comprehensive quantum mechanical theoretical model accounting for the self-consistent bistable tunneling transmission is in quantitative agreement with the experimental data. The measured peak transconductance sensitivity value of 6000 mS can be used in the highly sensitive detector and non-linear device applications.
共振隧道超晶格晶体管中的超灵敏电流双稳态性和光开关
半导体超晶格和量子级联激光器结构的电流-电压双稳态特性具有广泛的应用潜力,尤其是在传感系统中。然而,在传统的双端结构中,外加偏压和电流注入之间的相互依存关系导致了分析的复杂性,并使双稳态现象难以在实际应用中实现。在这里,我们报告了一种新型电子双稳态,它与共振隧道双极超晶晶体管中的光学开关相耦合。这种双稳态性表现为集电极电流在外加电压极小变化时出现急剧的不连续性,这是由于在晶体管基极边缘的二维电子气体(2DEG)与集电极超晶格结构之间的异质势垒上出现了不稳定的隧道传输。高量子力学传输和低量子力学传输之间的电子转换被证明是由二维电子气体和超晶格之间异质界面的内部电场的自洽变化引起的。它们也存在于三端器件的基极电流中,并导致带间辐射重组过程中近红外自发辐射输出的急剧切换,其峰值发射波长为 1.58 μm。解释自洽双稳态隧道传输的综合量子力学理论模型与实验数据在数量上是一致的。测得的峰值跨导灵敏度值为 6000 mS,可用于高灵敏度探测器和非线性器件应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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