Arrange the following fabrication steps in order needed to fabricate the IC : (a) Oxidation (b) Etching (c) Metallization (d) Epitaxial growth Codes :
(d) (a) (b) (c)
In the fabrication of Integrated Circuits (ICs), various processes are employed in precise chronological order to create functional semiconductor devices. The given question requires us to arrange the steps in the correct sequence needed to fabricate an IC. Here is the step-by-step solution:
- Epitaxial Growth:
The first step in IC fabrication is often the epitaxial growth process. This involves growing a layer of single-crystal silicon on a substrate. This step is critical as it provides a high-quality crystal structure needed for the subsequent fabrication steps.
- Oxidation:
Once the epitaxial layer is prepared, the next step is oxidation. This process is used to create a high-quality silicon dioxide layer on the silicon wafer, which acts as an insulator and provides protection for the silicon underneath during future processing steps.
- Etching:
After oxidation, etching is carried out to remove specific areas of the oxide layer. This step is crucial for defining the regions where dopants will be diffused into the silicon or where further processing steps will take place.
- Metallization:
The final step is metallization, where metal layers are deposited. These layers form the electrical connections, or interconnections, between different components on the chip. This step is essential for establishing the functionality of the IC.
Therefore, the correct sequence is: Epitaxial Growth → Oxidation → Etching → Metallization. This corresponds to option (d) (a) (b) (c).
Conclusion: Recognizing the importance of each fabrication step in IC design ensures a deep understanding of semiconductor device manufacturing processes, critical for students preparing for exams in Electronic Devices.
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