What is a semiconductor?

Semiconductors are materials that possess electrical properties intermediate between conductors and insulation, and their ability to change the way electricity flows depending on the conditions. By utilizing this property, it is possible to create electronic components that can control the flow current or electrical signals.

The difference between conductors, semiconductors, and insulation

Why is being able to "control electricity" important?

Electronic devices need to do more than simply conduct electricity; they also need to conduct electricity at the necessary times, amplify signals, and process information.

Semiconductors are used as important materials configuration electronic circuits because their properties and structure allow for control of electrical currents.

Semiconductors are made from a variety of materials, but silicon is one of the most common materials widely used in electronic devices.

Semiconductor materials such as silicon

Semiconductor materials are processed into device with electrical functions by utilizing properties such as the ease with which electrons move.

Semiconductors can be given the necessary electrical characteristic not only by controlling the material itself, but also by control the type, amount, and structure of impurities.

What is doping?

Doping is a technique that modifies the electrical properties of semiconductor materials by adding very small amounts of impurities.

Typical examples are N-type semiconductors and P-type semiconductors. Each has different properties related to the carriers that carry electricity.

Intentionally altering the properties of materials in this way is one of the fundamental concepts for creating semiconductor device.

A PN junction is structure formed by joining a P-type semiconductor and an N-type semiconductor. It is one of the fundamental structure for understanding semiconductor device.

What happens when you join a P-type and an N-type?

When a P-type and an N-type diode are joined, the carrier distribution changes near the junction, creating a region with electrical properties. This property can be used to control the flow of current.

Basic structure that leads to a diode

A typical device that utilizes the properties of a PN junction is the diode. Its ability to easily allow current to flow in one direction makes it useful in various circuits for rectification, protection, and other applications.

device that utilize the properties of semiconductors include diodes and transistors.

Modern electronic devices utilize integrated circuits (ICs), which are large-scale integrations of these semiconductor device.

Semiconductors are incorporated into a wide variety of products we use every day. Even products that don't seem to have anything to do with semiconductors at first glance actually use multiple semiconductor device.

Semiconductor device are not simply completed by preparing the materials. They are manufactured through many process, including wafer preparation, film formation, process of unwanted parts, process of process, formation of fine process, and inspection.

It starts with silicon wafers

A wafer, which serves as the substrate, is prepared from semiconductor materials such as silicon, and then various processing steps are repeatedly applied to its surface to form device.

process such as film formation, oxidation, diffusion, and etching.

Semiconductor manufacturing involves repeated process such as forming films on the surface of materials, introducing impurities, and removing unwanted parts. Maintaining appropriate conditions at each stage of these process is crucial.

Microfabrication and inspection

As microfabrication for circuit formation progresses, the importance of measurement and inspection to check dimensions, film thickness, defects, and other factors increases.

Why is "temperature" important in the manufacturing process?

Semiconductor manufacturing involves processes such as crystal growth, diffusion, CVD, film deposition, and heat treatment, where temperature conditions are process. Therefore, it is important to accurately measure, control, record, and monitor temperature as needed.

In semiconductor manufacturing, it's crucial not only to check the finished product at the end, but also to monitor its condition at various stages of the manufacturing process to identify any abnormalities or variations.

Understand the status of process.

By measuring temperature, film thickness, dimensions, defects, etc., you can confirm whether process conditions are as expected.

Investigating the cause of the abnormality

Recording data during process provides clues to identify which conditions changed when quality problems occur.

To improve process

By comparing accumulated measurement data, it may be possible to understand variations and trends in conditions, which can then be used to improve process and yield.

For those who wish to learn more about semiconductor materials, doping, N-type/P-type semiconductors, PN junctions, and other related topics, we have prepared basic materials.

Basic knowledge of semiconductors

This document summarizes what semiconductors are, the differences between semiconductors, conductors, and insulation, materials and doping, PN junctions, and common applications.

Download PDF document

This is recommended for those who want to check the overview on the webpage and then read the detailed information as reference material.