Type P silicon, as I said in the previous article, there are two types of semiconductor silicon, namely N type silicon and P type silicon. This article will discuss about P-type silicon.
If N-type silicon is a mixture of silicon and phosphorus, where silicon has 4 electron elements and phosphorus has 5 electron elements, 1 electron from phosphorus will continue to move because it cannot be bound by the four pairs of electrons. So on the contrary, P-type silicon is a mixture of silicon which has 4 electron elements mixed with materials or materials that have 3 electron elements, such as boron, aluminum, indium, and gallium.
Now we will try to mix silicon with boron. Boron gas has only three electrons in its outer shell and can only bind three of the four surrounding silicon atoms. This leaves a single silicon atom with a vacant location in the outer shell, called "holes," these holes are considered to be carriers of positive charge. When an electric voltage is applied throughout the silicon-boron mixture, the holes will move towards the negative voltage while the other electrons fill up the places they left behind. Then this process is called P type silicon, which means silicon is a positive charge carrier.
When a schematic is made in the image, it will look like the image below:
The picture above is only an illustrative schematic example of the atomic structure of a mixture of silicon with boron to produce type P silicon. It is clear that the holes formed by the fourth atom of silicon.
From the two experiments above (and from the previous article), we can know that objects or materials or materials that were previously insulating, cannot conduct electric current, by giving a mixture of other elements or materials, can change their nature to become a conductor. For example silicon mixed with boron. This is the object or material is semiconductor.
The combination of N-type silicon with P-type silicon, you can find in the battery. Where the positive end is P-type silicon and the negative end is N-type silicon.