Question

The set of elements that are used in the fabrication of transistors is:

• A. Si, Ge, Ga
• B. B, Al, Ga
• C. In, Si, Al
• D. Si, Ga, As

Hint:

Transistor materials fall into two main categories: elemental semiconductors from Group 14 (like Si and Ge) and compound semiconductors, most commonly from Groups 13 and 15 (like GaAs and InP). Look for options that represent these categories.

Answer 1

The Correct Option is D

The question asks about the elements used in the fabrication of transistors. Let's analyze each option to determine which set of elements is used typically in transistor fabrication:

1. Si (Silicon), Ge (Germanium), Ga (Gallium):
   • Silicon (Si) and Germanium (Ge) are well-known semiconductors widely used in electronic device manufacturing, including transistors.
   • Gallium (Ga), however, is typically used in combination with arsenide (GaAs) or other elements, not on its own as a primary transistor material.
2. B (Boron), Al (Aluminium), Ga (Gallium):
   • Boron (B) and Aluminium (Al) are not primary materials for semiconductor devices; they are typically used as dopants to modify electrical properties.
3. In (Indium), Si (Silicon), Al (Aluminium):
   • Indium (In) is generally used in specific compound semiconductors, but alone it is not a main element for standard transistors.
   • Silicon (Si) is a fundamental semiconductor, but Aluminium (Al) again serves primarily as a dopant or conductive material.
4. Si (Silicon), Ga (Gallium), As (Arsenic):
   • Silicon (Si) is a major material for most electronics including transistors.
   • Gallium (Ga) and Arsenic (As) combine to form Gallium Arsenide (GaAs), a widely used semiconductor in high-speed devices and optoelectronics.
   • This combination is particularly effective due to the properties of GaAs, making it a popular material in specialized high-frequency applications.

Based on the above analysis, the correct answer is the option with Silicon, Gallium, and Arsenic. These elements are used in semiconductor materials, specifically Gallium Arsenide, which is commonly used alongside Silicon in transistor fabrication.