4.6 Article

Analytical Modeling of Current Gain in Multiple-Quantum-Well Heterojunction Bipolar Light-Emitting Transistors

Journal

IEEE TRANSACTIONS ON ELECTRON DEVICES
Volume -, Issue -, Pages -

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TED.2023.3289930

Keywords

Quantum well devices; Mathematical models; Transistors; Optical sensors; High-speed optical techniques; Charge carriers; Analytical models; Current gain; light-emitting transistors (LETs); multiple-quantum-well (MQW); MQW heterojunction bipolar LETs (MQW-HBLETs); quantum-well heterojunction bipolar transistors (QW-HBTs)

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We developed an analytical model to determine the current gain of HBLETs with MQWs inserted into the base. Our model provides insights into the transistor's operation and aids in designing an efficient epi-layer structure. The current gain decreases as the number of QWs in the base increases, but increases when the QW is placed near the collector. The number and position of QWs affect charge capture and ultimately impact the transistor's current gain. We verified our model using experimental data and layer structure designs.
We have developed an analytical model to determine the current gain of heterojunction bipolar light-emitting transistors (HBLETs) with multiple-quantum-wells (MQWs) inserted into the base of the transistor. Our modified charge-control model provides insights into the transistor's operation and facilitates the design of an efficient epi-layer structure. This can be achieved by adjusting the width of each quantum well (QW), the position of each QW in the base of heterojunction bipolar transistors (HBTs), and the separation of consecutive QWs. Our results show that the current gain decreases as the number of QWs in the base of the transistor increases, due to the trade-off between collector current gain and optical modulation gain. However, the current gain increases when the QW is placed near the collector. We have also investigated the number and position of QWs and their effects on charge capture, which ultimately affect the transistor's current gain. Our analytical model has been verified using previously published experimental data and layer structure designs for single and double QW-HBLETs.

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