Is the current in the diode moving with a positive charge or free electrons?

The diode is composed of a combination of p-type semiconductors and n-type semiconductors. P-type semiconductors are trivalent elements added to semiconductors, so that the outer layer of silicon atoms lacks an electron to form a stable structure, and holes are formed. The n-type body is the addition of pentavalent elements to the semiconductor, so that the outer layer of the silicon atom has one more electron to form a stable structure.

When a positive voltage is applied to the PN junction, the external voltage is opposite to the direction of the internal electric field, and the diffusion motion of many sons (electrons) is greater than the drift motion of few sons (positive charge), so the external circuit forms a current composed of p->n. Clear?

Electrons are negatively charged, and all that moves in the circuit can only be electrons, and there is no positive charge. Being positively charged can only be said to be lacking electrons, and the direction of the current is opposite to the direction of the electrons, which is very annoying, so don't think about these things.

I think you just have to remember that the current in a diode can only flow from its positive to negative and not from negative to positive.

The current in the diode is positively charged.

The current inside the diode is naturally the electrons moving against the direction of the external electric field.

What's moving, you ask?

To be exact:

There are three types of charges, one is the directional movement of positive charges, one is the directional movement of negative charges (including electrons such as ordinary wires), and the other is the directional movement of positive and negative charges in the opposite direction (such as the conduction of salt water solutions).

But there is only one direction of current: the direction in which the positive charge moves in a directional direction (artificially prescribed).

This distinction comes from the carriers of the current.

Carriers are divided into two types: positive charge and negative electron, so the movement of electric current can be divided into three types.

Theoretically speaking, it is, but the real movement is the negative charge, and people did not know the direction of the current movement in the past, so the current motion is defaulted to the positive charge movement, which is actually the negative charge moving to the positive charge, so now it is stipulated that the two move in the opposite direction.

Generally, conductive solids move only negatively charged electrons, but ionic solutions are generally positive and negative moving in opposite directions.

The diode is unidirectionally conductive and the forward conductor is reversed shut-off. Forward current means the current flowing from the positive electrode to the negative electrode, in the schematic diagram, a triangular tip is facing a vertical channel, that is, a diode, the triangle represents the direction of electricity, and the vertical channel represents the negative electrode.

The current is generated by the movement of carriers, which is true, because if it is a conductor, there will be movable electrons, so the voltage will be added to adsorb the charge, and the current will be generated.

If you don't understand correctly, the difference between the charges in the diode is not as shown in Figure 1, and the p and n regions are basically electrically neutral (except for a small area of the interface that is the depletion region), which means that the p and n regions are both positively and negatively charged.

It's just that only the positive charge can move freely in the p-region, and only the negative charge can move freely in the n-region.

There are detailed explanations in the freshman physics books! Search for yourself! Hey.

Good question.

Yes, the positive charge and electrons have an attraction, but the non-electrostatic force given to him by the power supply is very small and negligible.

The internal chemical reaction of the power supply causes a potential difference between the two ends, which causes the charge to move in a directional manner.

It's not that complicated, you can first understand that this is caused by external forces, what you said is just the relationship between the two without the action of external forces, and you will naturally understand when you have deep contact in the future, and only by specializing in the direction of electricity can you continue to study in depth.

To give you an analogy: the reservoir is the battery, the positive pressure is the gate, and the negative pressure is the drop. If there is a drop in the gate, then the water will naturally flow downstream, at this time, the water impulse is the current, the more impulse, the wider the water splash under the drop, and the water splash is electron radiation! The principle is the same.

The direction of the current is opposite to that of the negative charge (i.e., the electrons).

The negative charge flows from the negative electrode to the positive electrode, and the current direction is from the positive electrode to the negative electrode.

How to say, if it is a metal conductor, the metal is a crystal, and although the outer electrons can move freely without the constraints of the nucleus, the cationic part can only vibrate near the crystal lattice, that is, it cannot move freely. Then it can only be the electrons involved in conducting electricity. In this case, it can only be said that the direction of the current is opposite to the direction of movement of the electrons.

And if in the electrolyte, there are both positive and negative ions moving freely, both of which can be said.

I remember that the current was like this, to describe it to you.

The house represents the object, the room represents the positive charge, and the person represents the negative charge.

The object is like a room with many rooms, when there are people living in each room, there is no electricity for the object, when the room is full of people, it is negative, and when there is no one in the room, it is positive, the battery is to use voltage to make one side of the crowd and one side of the person, and the person has fluidity, he finally walks from the negative pole of the battery to the positive pole of the room through the conductor, so that the current is formed.

So it's the latter that you are talking about. Hope that explains, hehe.

Both positive and negative charges can form an electric current, in a metal wire it is a current formed by a negative charge moving, and in a solution, both positive and negative charges are moving.

The positive charge does not move, it is the negative charge that moves, and it is the electrons that move in the metal.