J. Phys. IV France 11 (2001) Pr3-931-Pr3-936
MOCVD grown InGaP/GaAs multiple negative-differential-resistance (MNDR) resonant-tunneling bipolar transistorsW.-C. Liu, H.-J. Pan, C.-H. Yen, K.-P. Lin, C.-Z. Wu, W.-H. Chiou and C.-Y. Chen
Institute of Microelectronics, Department of Electrical Engineering, National Cheng-Kung University, 1 University Road, Tainan, Taiwan 70101, Republic of China
We propose two InGaP/GaAs resonant tunneling bipolar transistors (RTBT's) with different superlattice (SL) structures in the emitters. Based on the calculations of transmission probability, the ground-state and first excited-state minibands are estimated. The electron transmission through SL structures is significantly determined by the electric field behaviors across the barriers. The specific designs of barrier width in the SL structures are responsible for two electron transport mechanisms of sequential RT conduction associated with the minibands. Experimentally, at higher current levels, the double- and quaternary-negative difference resistance (NDR) phenomena are respectively observed for both devices at 300K. Furthermore, the experimental results are in good agreement with the theoretical prediction.
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