HyDraZin3 said:When electrons from N region diffuse to P region, the electrons combine with holes to form a -ve negative ion leaving behind a +ve ion in P region.So, my doubt is how the holes accept the electrons and get a negative charge because as the holes are positively charged, when they accept the electron which is negatively charged the net charge should be neutral.
THANKS
Imagine a perfect, neutral lattice of silicon. Now, at a single position, remove one proton from a nucleus and one electron. It is still neutral, as you removed one positive charge and one negative charge. The silicon atom became an aluminium atom, and as you removed one electron there is a position where a new electron from somewhere else can fit in.HyDraZin3 said:can you tell me the reason why holes do not have a positive charge on induced doping?
A semiconductor is a material that has electrical conductivity between that of a conductor and an insulator. This means that it can conduct electricity to a certain extent, but not as easily as a conductor. Common examples of semiconductors include silicon, germanium, and gallium arsenide.
A p-n junction is the boundary between two different types of semiconductors - p-type and n-type. In a p-n junction, the p-type material has an excess of positively charged particles (holes), while the n-type material has an excess of negatively charged particles (electrons). This creates a depletion region at the junction, with a built-in electric field.
A p-n junction works by allowing electric current to flow in one direction, but not the other. When a voltage is applied in the forward direction (from p-type to n-type), the depletion region gets smaller and allows current to flow. In the reverse direction, the depletion region gets larger and prevents current flow.
P-n junctions are used in electronic devices as diodes, which allow current to flow in one direction but not the other. They are also used as the basis for transistors, which are essential components in modern electronics. P-n junctions also play a crucial role in solar cells, converting light energy into electrical energy.
P-n junctions are typically made by doping (adding impurities to) a semiconductor material. Doping with an element that has one more electron than the semiconductor (e.g. phosphorus for silicon) creates an n-type semiconductor, while doping with an element that has one less electron (e.g. boron for silicon) creates a p-type semiconductor. These two materials are then joined together to form a p-n junction.