30 May 2017 Resonant tunneling transport in ZnxBe1-xSe/ZnSe/ZnyBe1-ySe asymmetric quantum structures
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Abstract
II-VI compounds are promising materials for the fabrication of room-temperature terahertz devices due to their beneficial properties like as type-I conduction band alignment, high breakdown field strength (~331 kV/cm for ZnSe vs. ~80 kV/cm for GaAs), and higher values of the conduction band offset (1.5 eV for BeSe/ZnSe vs. 0.7 eV for AlAs/GaAs). In this paper we report on numerical study of the resonant tunneling transport in ZnBeSe/ZnSe/ZnBeSe symmetric and asymmetric resonant tunneling diodes (RTDs). The negative differential resistance feature is observed in the current-voltage characteristics of the ZnSe-based RTDs. It is found that the maximum of peak-to-valley ratio (PVR) of the current density is equal to 6.025 and 7.144 at 150 K, and to 1.120 and 1.105 at 300 K for the symmetric and asymmetric RTDs, respectively. The effect of barrier heights on the frequency and output power performance of RTD devices are studied and discussed.
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Vadim P. Sirkeli, Vadim P. Sirkeli, Oktay Yilmazoglu, Oktay Yilmazoglu, Shihab Al-Daffaie, Shihab Al-Daffaie, Ion Oprea, Ion Oprea, Duu Sheng Ong, Duu Sheng Ong, Franko Küppers, Franko Küppers, Hans L. Hartnagel, Hans L. Hartnagel, } "Resonant tunneling transport in ZnxBe1-xSe/ZnSe/ZnyBe1-ySe asymmetric quantum structures", Proc. SPIE 10248, Nanotechnology VIII, 1024811 (30 May 2017); doi: 10.1117/12.2265367; https://doi.org/10.1117/12.2265367
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