MindMap Gallery Semiconductor device
When a forward voltage is applied to the diode (forward biased, the anode is connected to positive and the cathode is connected to negative), the diode is in a forward conducting state, the forward resistance of the diode is small, and the forward current is large.
Edited at 2022-03-20 18:47:20Avatar 3 centers on the Sully family, showcasing the internal rift caused by the sacrifice of their eldest son, and their alliance with other tribes on Pandora against the external conflict of the Ashbringers, who adhere to the philosophy of fire and are allied with humans. It explores the grand themes of family, faith, and survival.
This article discusses the Easter eggs and homages in Zootopia 2 that you may have discovered. The main content includes: character and archetype Easter eggs, cinematic universe crossover Easter eggs, animal ecology and behavior references, symbol and metaphor Easter eggs, social satire and brand allusions, and emotional storylines and sequel foreshadowing.
[Zootopia Character Relationship Chart] The idealistic rabbit police officer Judy and the cynical fox conman Nick form a charmingly contrasting duo, rising from street hustlers to become Zootopia police officers!
Avatar 3 centers on the Sully family, showcasing the internal rift caused by the sacrifice of their eldest son, and their alliance with other tribes on Pandora against the external conflict of the Ashbringers, who adhere to the philosophy of fire and are allied with humans. It explores the grand themes of family, faith, and survival.
This article discusses the Easter eggs and homages in Zootopia 2 that you may have discovered. The main content includes: character and archetype Easter eggs, cinematic universe crossover Easter eggs, animal ecology and behavior references, symbol and metaphor Easter eggs, social satire and brand allusions, and emotional storylines and sequel foreshadowing.
[Zootopia Character Relationship Chart] The idealistic rabbit police officer Judy and the cynical fox conman Nick form a charmingly contrasting duo, rising from street hustlers to become Zootopia police officers!
Semiconductor device
intrinsic semiconductor
Semiconductor conductive properties
semiconductor
Substances with electrical conductivity between conductors and insulators
heat sensitivity
When the ambient temperature increases, the electrical conductivity increases significantly
Photosensitivity
When exposed to light, the electrical conductivity changes significantly
Doping
Doping certain impurities into a pure semiconductor significantly changes its conductivity
intrinsic semiconductor
concept
A completely pure semiconductor with a crystal structure is called an intrinsic semiconductor
Conductive mechanism
When an external voltage is applied to both ends of the semiconductor, free electrons appear in the semiconductor for directional movement (electron current) and valence electrons complement holes (hole current).
Free electrons and holes are both called carriers
Notice:
The number of carriers in an intrinsic semiconductor is very small, and its conductive properties are very poor.
The higher the temperature, the greater the number of carriers and the better the conductivity of the semiconductor.
N-type semiconductor and P-type semiconductor
Adding trace amounts of impurities (certain elements) into intrinsic semiconductors to form impurity semiconductors
N-type semiconductor
Incorporating pentavalent elements
Free electrons are majority carriers and holes are minority carriers
P-type semiconductor
Incorporation of trivalent elements
Holes are majority carriers and free electrons are minority carriers
Neutral, does not show electricity to the outside world
PN junction and its one-way conductivity
Formation of PN junction
Concentration difference, diffusion movement of multiple particles, broadening of space charge
Internal electric field, drift motion of minority carriers, narrowing of space charge region
One-way conductivity of PN junction
When a forward voltage is applied to the PN junction: the PN junction becomes narrower, the forward current is larger, the forward resistance is smaller, and the PN junction is in a conducting state.
When a reverse voltage is applied to the PN junction: the PN junction becomes wider, the reverse current is smaller, the reverse resistance is larger, and the PN junction is in a cut-off state
semiconductor diode
When a forward voltage is applied to the diode (forward biased, the anode is connected to positive and the cathode is connected to negative), the diode is in a forward conducting state, the forward resistance of the diode is small, and the forward current is large.
When a reverse voltage is applied to the diode (reverse biased, the anode is connected to negative and the cathode is connected to positive), the diode is in a reverse cutoff state. The reverse resistance of the diode is large and the reverse current is very small.
When the applied voltage is greater than the reverse breakdown voltage, the diode is broken down and loses its unidirectional conductivity.
The reverse current of the diode is affected by temperature. The higher the temperature, the greater the reverse current.
special diode
Zener diode
Works in reverse breakdown state and plays the role of voltage stabilization
Optoelectronic devices
bipolar transistor
External conditions for transistor amplification: emitter junction forward biased, collector junction reverse biased
Current relationship of each electrode and current amplification effect
IE=IB IC
IC≈βIB
Characteristic curve
field effect transistor
Insulated gate field effect transistor