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Semiconductor Device and Design - 4,

"Semiconductor Device and Design - 4,"에 대한 내용입니다.
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파워포인트
최초등록일 2023.06.22 최종저작일 2020.06
semiconductor Device and design
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Semiconductor Device and Design - 4,
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  • 미리보기

    목차

    1. Diode’s fabrication Process
    2. Capacitor’s fabrication Process
    3. Difference between Bipolar process and Mosfet process
    4. Bipolar process and design section drawing

    본문내용

    ■ Two commonly used techinques for Diode Fabrication Process and Packaging are the alloy method and the diffusion method.

    -Figure (a) shows an alloy diode. To construct an alloy diode, a pn-junction is formed by melting a tiny pellet of aluminum on the surface of an n-type crystal. An n-type impurity may be melted on the surface of a p-type crystal.

    참고자료

    · Basic Electronics for Scientists and Engineers : Dennis L. Eggleston
    · https://global.oup.com/us/companion.websites/fdscontent/uscompanion/us/static/companion.websites/9780199339136/Appendices/Appendix_G.pdf
    · https://eng.libretexts.org/Bookshelves/Materials_Science/Supplemental_Modules_(Materials_Science)/Semiconductors/Metal-Oxide-Semiconductor-Field-Effect-Transistor
    · https://www.researchgate.net/figure/Bipolar-process-overview-of-device-type-B-with-deposited-and-wet-etched-silicon-nitride_fig2_226216054

  • AI와 토픽 톺아보기

    • 1. Diode's fabrication process
      The fabrication process of a diode is a critical step in the manufacturing of semiconductor devices. It involves a series of complex steps that require precise control and careful execution to ensure the desired electrical characteristics and performance of the final product. The process typically starts with a semiconductor wafer, usually made of silicon, which undergoes various deposition, doping, and etching techniques to create the diode structure. Key steps include the formation of the p-n junction, the creation of the anode and cathode regions, and the addition of metal contacts for electrical connections. Careful control of parameters such as temperature, pressure, and material composition is essential to produce high-quality diodes with consistent performance and reliability. The fabrication process also needs to be optimized to ensure cost-effectiveness and scalability for mass production. Overall, the diode fabrication process is a critical component in the development of modern electronic devices and systems.
    • 2. Capacitor's fabrication process
      The fabrication process of a capacitor is a crucial step in the manufacturing of electronic components. Capacitors are essential for various applications, such as filtering, bypassing, and timing circuits, and their performance is directly dependent on the quality of the fabrication process. The process typically starts with the selection of the appropriate dielectric material, which can be a ceramic, polymer, or thin-film material, depending on the desired capacitor characteristics. The dielectric is then deposited or grown on a conductive substrate, such as metal or semiconductor, to form the capacitor structure. This is followed by the deposition of the top and bottom electrodes, which are responsible for storing and releasing the electrical charge. The entire structure is then encapsulated or packaged to protect it from environmental factors and ensure long-term reliability. The fabrication process requires precise control of parameters such as material composition, layer thickness, and deposition techniques to achieve the desired capacitance, voltage rating, and other electrical properties. Continuous improvements in fabrication techniques and materials have led to the development of highly efficient and compact capacitors that are essential components in modern electronic devices and systems.
    • 3. Difference between Bipolar process and Mosfet process
      The key difference between the bipolar and MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) fabrication processes lies in the underlying operating principles and the resulting device characteristics. Bipolar transistors, such as the bipolar junction transistor (BJT), rely on the flow of both electrons and holes (positive and negative charge carriers) to control the current. The fabrication process for bipolar transistors typically involves the creation of a p-n-p or n-p-n structure, where the base region is sandwiched between the emitter and collector regions. This structure allows for the control of the current flow between the emitter and collector by applying a voltage to the base. In contrast, MOSFET devices operate based on the principle of field-effect, where the current flow is controlled by the application of an electric field to the gate terminal. The fabrication process for MOSFETs involves the creation of a metal-oxide-semiconductor structure, where a thin layer of insulating oxide (typically silicon dioxide) is grown or deposited on a semiconductor substrate, and the source, drain, and gate regions are then formed. The key differences in the fabrication processes are: 1. Doping: Bipolar transistors require more complex doping profiles to create the p-n-p or n-p-n structure, while MOSFETs have a simpler doping profile for the source, drain, and channel regions. 2. Gate structure: MOSFETs have a metal-oxide-gate structure, while bipolar transistors do not have a gate. 3. Current flow: Bipolar transistors rely on the flow of both electrons and holes, while MOSFETs rely solely on the flow of majority charge carriers (either electrons or holes). These differences in the fabrication processes and device structures lead to distinct performance characteristics, such as speed, power consumption, and scalability, making each technology more suitable for different applications in the electronics industry.
    • 4. Bipolar process and design section drawing
      The bipolar process and the associated design section drawing are crucial aspects in the fabrication of bipolar transistors, which are widely used in various electronic circuits and systems. The bipolar process typically involves the following key steps: 1. Substrate preparation: A semiconductor wafer, usually made of silicon, is used as the starting material. 2. Isolation: Regions of the wafer are isolated from each other using techniques such as p-n junction isolation or shallow trench isolation (STI) to prevent unwanted current leakage. 3. Doping: Selective doping of the wafer is performed to create the desired p-n-p or n-p-n structure of the bipolar transistor. This involves the introduction of impurities, such as boron or phosphorus, into specific regions of the wafer. 4. Emitter, base, and collector formation: The emitter, base, and collector regions of the bipolar transistor are formed through a series of doping and deposition steps. 5. Metallization: Metal layers are deposited and patterned to create the electrical contacts for the emitter, base, and collector regions. 6. Passivation and packaging: The fabricated device is encapsulated in a protective package to ensure long-term reliability and performance. The design section drawing of a bipolar transistor typically includes the following key features: 1. Substrate: The semiconductor wafer, usually made of silicon, serves as the foundation for the device. 2. Isolation regions: The isolation regions, such as p-n junctions or STI, are depicted to separate the individual transistor structures. 3. Emitter, base, and collector regions: The distinct regions of the bipolar transistor, including the emitter, base, and collector, are clearly identified in the drawing. 4. Metallization: The metal layers and contacts for the emitter, base, and collector are shown, providing the electrical connections to the device. 5. Passivation and packaging: The protective layers and packaging structure surrounding the fabricated device are also included in the design section drawing. The bipolar process and the associated design section drawing are essential for understanding the fabrication and structure of bipolar transistors, which are widely used in analog, mixed-signal, and power electronics applications.

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