GaAs Bipolar transistor with a triple-well emitter structure

Wen-Chau Liu, Der Feng Guo, Wen Shiung Lour, Chung Yih Sun

研究成果: Conference contribution


In this paper, we start with the calculation on subbands of the undoped AlGaAs-GaAs triple-well structure by using transfer matrix approach. In order to obtain more accurate solutions, we have considered the influence of the different electron mass within quantum wells, and potential barriers. .,The studied structure consists of a n+-GaAs, a 30-A GaAs, a 20-A Alo.45Qao.55As, a 50-A GaAs, a 40-A Alo.3Gao.7As, a 30-A GaAs, a 40-A Alo.3Gao.7As, a 110-A GaAs, a 20-A Alo.45Gao.55As, and a n+-GaAs layers. The band diagram of this structure is shown in Fig.l. There are three subbands (Eiq, En, E12) in Wi, one subband (E20) in W2, and one subband (E30) in W3, respectively. The illustration of the transmission coefficient T∗T versus the longitudinal electron energy Ez at zero bias is shown in Fig.2(a). Subband Eto operates as an injection level of electrons from the cathode layer. So only the electrons with energy close to E10 are injected to Wi. The transmission probability of this level approaches 100% when subband E20 or E30 resonates with this injection level E10 under external bias. Furthermore, when an external bias is applied, the voltage drop is expected to take place not in Wi, but mostly in W2 and W3, because the electric field applied to Wi is screened by the injected electrons. Subband E30 resonates with the injection level Eio when an external bias V. of 80mV is applied; and, subband E20 resonates with subband Eto when V. of 400mV is applied. The transmission A. resonance spectra (T∗T-EZ) for 80mV and 400mV external bias are shown in Fig.2(b) and (c). We have also fabricated a GaAs bipolar transistor with a triple-well structure as emitter by molecular beam epitaxy (MBE). The current-voltage characteristics at 140K are shown in Fig.3. Only a negative-differential-resistance (NDR) phenomenon is observed. This is perhaps produced by the large energy difference existing between E20 and E10. The large number of the thermionic electrons, resulted from the higher external electric field, give a significant injection current and lead to a negligible resonant-tunneling effect in the transport properties. With a suitable parameter adjustment, this transistor will be more attractive in the design of quantum-functional devices.

主出版物標題SMS 1993 Technical Digest - 1993 Symposium on Semiconductor Modeling and Simulation
發行者Institute of Electrical and Electronics Engineers Inc.
ISBN(電子)0780312252, 9780780312258
出版狀態Published - 1993 一月 1
事件1993 Symposium on Semiconductor Modeling and Simulation, SMS 1993 - Taipei, Taiwan
持續時間: 1993 三月 61993 三月 7


名字SMS 1993 Technical Digest - 1993 Symposium on Semiconductor Modeling and Simulation


Conference1993 Symposium on Semiconductor Modeling and Simulation, SMS 1993

All Science Journal Classification (ASJC) codes

  • 電氣與電子工程
  • 電子、光磁材料
  • 建模與模擬


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