Contact Us

Tel :

+86(755)82737801

Fax :

+86(755)82737801

Skype :

quxiuyong

General Information :

quxiuyong2013@vip.163.com

Sales Department :

sales@zeyuankj.com

Quality Department :

QuXiuYong(Максим Цюй)

Quality

HOME > News> PN junction reverse conductivity

PN junction reverse conductivity

2017-03-16 18:40


When the PN junction plus reverse voltage, that is, the positive pole of the power supply connected to the N area, the negative then P area. The direction of the applied electric field is the same as the direction of the electric field in the PN junction, and the PN junction is in the reverse bias. Under the action of the reverse voltage, the holes in the P region and the electrons in the N region will further leave the PN junction, so that the thickness of the depletion region is widened and the internal electric field of the PN junction is strengthened.


This result, on the one hand, makes it difficult for the majority of the carriers in the P and N regions to cross the barrier, and the diffusion current approaches zero. On the other hand, due to the enhancement of the internal electric field, the minority carriers in the N region and the P region are more likely to generate drift motion. In this way, the current flowing through the PN junction is determined by the dominant drift current. The drift current is shown on the external circuit with a reverse current IR flowing into the N region.


Since the minority carriers are generated by the intrinsic excitation, the concentration is very small, so IR is very weak, usually the order of microanian. When the tube is made, the IR value is determined by the temperature, almost independent of the applied voltage. IR is affected by temperature, in some practical applications, must also be considered. PN junction in the reverse bias, IR is very small, PN junction presents a large resistance, it can be considered that it is basically non-conductive.


  • Omron Omron Printed Circuit Board Inspection Device

    Omron high-performance printed circuit board appearance inspection device, to improve the quality of electronic equipment to contribute In...

  • Toshiba Tecra R800 series

    Toshiba Tecra R800 seriesTecra R800 series equipped with the second generation of intelligent Intel Core TM i5 dual-core processor ...

  • Omron Omron MEMS Flow Sensors

    Omron Omron MEMS Flow Sensors As a new generation of fuel cell system components that mitigate environmental burdens, MEMS flow...

  • The Application of Varistor

    The Application of VaristorVaristors are generally used in circuit surge and transient protection circuits. Varistor is a transient vol...

Electronic Components Manufacturers

FOLLOWUS

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z  0 1 2 3 4 5 6 7 8 9    A B C D E F G H I J K L M N O P Q R S T U V W X Y Z  0 1 2 3 4 5 6 7 8 9    A B C D E F G H I J K L M N O P Q R S T U V W X Y Z  0 1 2 3 4 5 6 7 8 9