A unified figure of merit for interband and intersubband cascade devices
A unified figure of merit for interband and intersubband cascade devices
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DOI：
10.1016/j.infrared.2018.11.033
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发表时间：
2019-01-01
影响因子：
3.3
通讯作者：
Santos, Michael B.
中科院分区：
文献类型：
--
作者：
Huang, Wenxiang;Rassel, S. M. Shazzad;Santos, Michael B.
通过探索半经验模型，确定了饱和电流密度J（0），以体现带间级联器件（ICD）和子带间量子级联器件（QCD）之间的载流子寿命的显着差异。在此基础上，从室温下的ICD和QCD的电流-电压特性中提取了大量的J（0）值。通过分析和比较现有的ICD和QCD数据，我们展示了如何J（0）可以作为一个统一的品质因数，以评估带间和子带间级联配置的设备功能。通过比较中红外探测器和光伏电池的探测率（D*）和开路电压（V-oc），说明了J（0）对中红外探测器和光伏电池性能的重要性。通过提取的J（0）值（ICDs的J（0）值比QCD的J（0）值低一个数量级以上）以及对器件性能影响的讨论，在相同的框架下，清晰地揭示了带间量子级联结构优于子带间量子级联结构. QCD和ICD的总体情况从统一的优值的角度给出了启示，这将为ICD和QCD的未来发展提供有益的指导和激励。
By exploring a semi-empirical model, the saturation current density J(0) is identified to manifest the significant difference in carrier lifetime between interband cascade devices (ICDs) and intersubband quantum cascade devices (QCDs). Based on this model, the values of J(0) have been extracted for a large number of ICDs and QCDs from their current-voltage characteristics at room temperature. By analyzing and comparing available ICD and QCD data, we demonstrate how J(0) can be used as a unified figure of merit to evaluate both interband and intersubband cascade configurations for their device functionality. The significance of J(0) on the performances of mid-infrared detectors and photovoltaic cells is illustrated by comparing the measured detectivity (D*) and the estimated open-circuit voltage (V-oc) respectively. From extracted values of J(0), which are more than one order of magnitude lower in ICDs than that in QCDs with similar transition energies in active regions, and discussion of the consequences on device performance, the advantages of interband cascade configurations over intersubband quantum cascade configurations have been clearly revealed based on the same framework. The overall picture for both QCDs and ICDs sheds light from the perspective of a united figure of merit, which will provide useful guidance and stimulation to the future development of both ICDs and QCDs.