異質接面雙極性電晶體由於具有極佳的頻率特性，近幾年來已被廣泛的應用在數位及微波積體電路上，有鑑於此，在本論文中，我們將焦點著重在高頻元件的製程上，且成功的研製出以在低壓有機金屬化學氣相沉積法磊晶(LP-MOCVD)成長砷化鎵基板的異質接面雙極性電晶體。在第二章中我們比較有無自我對準製程技術的元件間特性的差別，而在第三章中，我們研製出一個磷化銦鎵/砷化鎵超晶格射極共振穿透雙極性電晶體。
因為聚亞醯胺(polyimide)具有低的相對介電係數、可降低表面複合電流、及較好的製程良率，因此我們於研究的元件上長一層聚亞醯胺(polyimide)鈍化層；此外，我們也研製了具有自我對準技術的元件；此元件可以得到一個較高的電流增益及較好的高頻表現特性；實驗上元件具有高於100的共射極電流增益值、高於8伏特的共射極崩潰電壓(BVCEO)、單一電流增益截止頻率(fT)約為20GHZ及最大振盪頻率(fmax)大於7.5GHZ。在第三章中，我們研製出一個磷化銦鎵/砷化鎵超晶格射極共振穿透雙極性電晶體，當提供一個大的基極電流(IB=200mA)時可得到一個高達220的共射極電流增益，在室溫下，亦可得到一個好的特性及有趣的三端負微分電阻現象。

Over the past years, heterojunction bipolar transistors (HBT’s) have been widely researched for digital and microwave applications due to the high frequency performances combined with high current driving capability. In this thesis, we focus on the process technology of high frequency device and have successfully fabricated and demonstrated GaAs-based heterojunction bipolar transistors (HBT's) by low pressured-metal organic chemical vapor deposition (LP-MOCVD). The performance of devices fabricated in self-aligned and traditional technology are measured and researched. In the chapter 3, The InGaP/GaAs superlattice emitter resonant tunneling bipolar transistors (SE-RTBT's) are fabricated and studied.
The polyimide passivation had been used in the studied device due to low relative dielectric constant, low surface recombination current and good yield. In addition, the devices with self-aligned technology have been fabricated. The high common emitter current gain and good high frequency performance are obtained. A typical device structure combined with the standard fabrication process exhibit a common-emitter current gain b>100, a common-emitter breakdown voltage BVCEO > 8 V, a unity current gain cutoff frequency fT @ 20 GHZ, and a maximum oscillation frequency fmax > 7.5 GHZ. In the chapter 3, an In0.49Ga0.51P/GaAs superlattice-emitter resonant tunneling bipolar transistor (SE-RTBT) has been fabricated. The common-emitter current gain up to 220 is obtained under the applied larger base current of IB=200mA/step at 300K. The good transistor performances and an interesting three-terminal controlled multiple N-shaped NDR phenomena are obtained at room temperature.

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[100] Wei-Chou Wang, Jing-Yuh Chen, Hsi-Jen Pan, Shun-Ching Feng, Kuo-Hui Yu, and Wen-Chau Liu, “Study of InGaP/GaAs/InGaP Double d-Doped Heterojunction Bipolar Transistor”, Superlattice and Microstructures, Vol.26, pp. 23-33, 1999.
[101] Shiou-Ying Cheng, Wen-Chau Liu, Wen-Lung Chang, Hsi-Jen Pan, Wei-Chou Wang, Jing-Yuh Chen, Shun-Ching Feng, and Kuo-Hui Yu, “Observation of the Impulse-Like Negative-Differential-Resistance of Superlatticed Resonant-Tunneling Transistor”, Appl. Phys. Lett., Vol.75, No.1, pp.133-135, 1999.
[102] Wen-Chau Liu, Wei-Chou Wang, Jing-Yuh Chen, Hsi-Jen Pan, Shiou-Ying Cheng, Kong-Beng Thei, and Wen-Lung Chang, “A Novel InP/InAlGaAs Negative-Differential-Resistance Heterojunction Bipolar Transistor (NDR-HBT) with Interesting Topee-Shaped Current-Voltage Characteristics”, IEEE Electron Device Lett., Vol.20, pp.510-513, 1999.
[103] Wen-Chau Liu, Hsi-Jen Pan, Shiou-Ying Cheng, Wei-Chou Wang, Jing-Yuh Chen, Shun-Ching Feng, and Kuo-Hui Yu, “Applications of an InGaAlAs/InP continuous-conduction-band structure for ultra-low current operation transistors”, Appl. Phys. Lett., Vol.75, No.4, pp.572-574, 1999.
[104] Wen-Chau Liu, Shiou-Ying Cheng, Hsi-Jen Pan, Jing-Yuh Chen, Wei-Chou Wang, Shun-Chin Feng, and Kuo-Hui Yu, “A New In0.5Ga0.5P/GaAs Double Heterojunction Bipolar Transistor (DHBT) Prepared by MOCVD”, Journal De Physique, Vol. 9, pp. 1155-1161, 1999.
[105] Wen-Chau Liu, Hsi-Jen Pan, Shiou-Ying Cheng, Wei-Chou Wang, Jing-Yuh Chen, Shun-Chin Feng, and Kuo-Hui Yu, “MOCVD Grown d-Doped InGaP/GaAs Heterojunction Bipolar Transistor”, Journal De Physique, Vol. 9, pp. 1163-1169, 1999.
[106] Jing-Yuh Chen, Wei-Chou Wang, Hsi-Jen Pan, Shun-Ching Feng, and Kuo-Hui Yu, Shiou-Ying Cheng, Wen-Chau Liu, “Characteristics of InGaP/GaAs delta-doped heterojunction bipolar transistor”, J. Vac. Sci. & Technol., Vol. 18, pp751-756, 2000.
[107] Wen-Chau Liu, Wei-Chou Wang, Hsi-Jen Pan, Jing-Yuh Chen, Shiou-Ying Cheng, Kun-Wei Lin, Kuo-Hui Yu, Kong-Beng Thei, and Chin-Chuan Cheng, “Multiple-route and multiple-state current-voltage characteristics of an InP/AlInGaAs switch for multiple-valued logic applications,” IEEE Trans. Electron Devices, vol. 47, no. 8, pp. 1553-1559, 2000.
[108] Wei-Chou Wang, Hsi-Jen Pan, Kong-Beng Thei, Kun-Wei Lin, Kuo-Hui Yu, Chin-Chuan Cheng, Lih-Wen Laih, Shiou-Ying Cheng, and Wen-Chau Liu, “Observation of resonant tunneling effect and temperature dependent characteristics of an InP/InGaAs heterojunction bipolar transistor,” Semicond. Sci. Technol,vol. 15, pp.935-940, 2000.
[109] Wen-Chau Liu, Hsi-Jen Pan, Wei-Chou Wang, Kong-Beng Thei, Kun-Wei Lin, Kuo-Hui Yu, and Chin-Chuan Cheng, “Temperature-dependent study of a lattice-matched InP/InGaAlAs heterojunction bipolar transistor,” IEEE Electron Device Lett., vol. 21, no.11, pp.524-527, 2000.
[110] Wei-Chou Wang, Hsi-Jen Pan, Kun-Wei Lin, Kuo-Hui Yu, Cheng-Zu Wu, Lih-Wen Laih, Shiou-Ying Cheng, and Wen-Chau Liu,“Investigation of InP/InGaAs Superlattice-Emitter Resonant Tunneling Bipolar Transistors (RTBT's),” Superlattices & Microstructures, vol. 29, no.2, pp.111-119, 2001.
[111] Wei-Chou Wang, Hsi-Jen Pan, Kuo-Hui Yu, Kun-Wei Lin, Jung-Hui Tsai, Shiou-Ying Cheng, and Wen-Chau Liu, “Study of the multiple-negative-differential-resistance (MNDR) switching behaviors based on heterojunction bipolar transistor (HBT) structures,” Superlattices & Microstructures, vol. 29, no.2, pp.133-145, 2001.
[112] Hsi-Jen Pan, Wei-Chou Wang, Kong-Beng Thei, Chin-Chuan Cheng, Kuo-Hui Yu, Kun-Wei Lin, Cheng-Zu Wu, and Wen-Chau Liu, “Investigation of Temperature-Dependent Performances of InP/In0.53Ga0.34Al0.13As Heterojunction Bipolar Transistors,” Semicond. Sci. Technol, vol. 15, pp. 1101-1106, 2000.
[113] Hsi-Jen Pan, Shun-Ching Feng, Wei-Chou Wang, Kun-Wei Lin, Kuo-Hui Yu, Cheng-Zu Wu, Lih-Wen Laih, and Wen-Chau Liu, “Investigation of an InGaP/GaAs Resonant-Tunneling Heterojunction Bipolar Transistor,” Solid-State Electron., (to be published).
[114] Wei-Chou Wang, Hsi-Jen Pan, Kun-Wei Lin, Kuo-Hui Yu, Chin-Chuan Cheng, Chih-Hung Yan, Shiou-Ying Cheng, and Wen-Chau Liu, “Characteristics of d-doped InP/InGaAlAs heterojunction bipolar transistors (HBT's),” Semicond. Sci. Technol, 2000, (to be published).