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PN junction Diode Explained | Forward Bias and Reverse Bias

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  • čas přidán 15. 08. 2024
  • In this video, the PN junction diode has been explained. And the working of this PN junction diode under forward and reverse bias has been explained.
    By watching this video, you will learn the following topics:
    0:16 What is PN Junction Diode
    1:48 The depletion region in the PN junction Diode
    3:50 Unbiased PN Junction Diode
    7:00 Forward-Biased PN Junction
    9:46 Reverse Biased PN Junction
    What is PN Junction Diode:
    When the P-type and N-type semiconductors are grown on the same crystal then the junction is formed where this P-type and N-type region meets. And this junction is known as the PN Junction. And the entire structure acts as a diode.
    The Depletion Region in PN Junction:
    In PN junction diode, when p-type and n-type regions are joined together then electrons from the n-side recombines with the holes near the junction. And in this process, they create the positive and negative ions nears the junction. Hence, the region near the junction only contains positive and the negative ions. And being depleted from the free charge region, this region near the junction is knowns as the Depletion region.
    The Unbiased PN Junction:
    In the PN junction, the positive and the negative ions near the junction creates an electric field (Also knowns as the built-in electric field). This electric field prevents the majority carriers on both p-type and n-type region from diffusing through the depletion region.
    So, the depletion region creates a barrier potential or built-in potential for majority carriers.
    For, silicon this built-in potential is 0.7V and for germanium, it is 0.3V.
    But due to this electric field, the minority carriers near the junction gets attracted towards the junction and swapped across the depletion region.
    But under no biasing, the flow of minority charge carrier (due to the built-in electric field) and flow of majority carrier (due to diffusion) balances each other and net current in the circuit is zero.
    The forward biased PN junction :
    In forward biasing, the p-type terminal is connected to the positive terminal of the battery. While the n-type is connected to the negative terminal of the battery.
    And as we increase the external biasing voltage, the width of the depletion region reduces. So, the resistance offered by the depletion region (to majority carrier reduces).
    And once the applied voltage is more than the built-in potential, the majority carriers are able to cross this depletion region barrier.
    So, under the forward bias condition, the current flows due to majority carriers. And the direction of the current is from p to n side. (Electrons moves from n-side to p-side and holes move from p-side to n-side)
    The reversed biased PN Junction:
    Under, reverse biased PN Junction, the p-side is connected to the negative terminal of the battery and n-side is connected to the positive terminal of the battery.
    And as the reverse bias voltage increases, the width of the depletion region also increases. So, the resistance offered by the depletion region also increases.
    But in the reverse bias condition, we get a flow of current due to minority carriers. Due to the strong electric field, the electrons get swapped from p-side to n-side and holes get swapped from n-side to p-side. So, in the reverse biased condition, we get a little flow of current due to minority carriers and the current flows from n-side to p-side. (In the reverse direction than the forward biased condition )
    And that's why this current is known as the reverse saturation current.
    This video will be helpful to all students of science and engineering in understanding the PN junction and how it works under forward and reverse biased condition.
    #PNJunction
    #ForwardBias
    #ReverseBias
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Komentáře • 314

  • @ALLABOUTELECTRONICS
    @ALLABOUTELECTRONICS  Před 5 lety +218

    The timestamps for the different topics covered in the video:
    0:16 What is PN Junction Diode
    1:48 The depletion region in the PN junction Diode
    3:50 Unbiased PN Junction Diode
    7:00 Forward-Biased PN Junction
    9:46 Reverse Biased PN Junction

    • @jinabalina8338
      @jinabalina8338 Před 3 lety

      رور

    • @rohitsunil1350
      @rohitsunil1350 Před 3 lety +1

      @@nix324 holes appear to move

    • @rohitsunil1350
      @rohitsunil1350 Před 3 lety +2

      @@nix324 it is still said that “current flows from positive to negative”. Since electrons are the ones that are moving then this statement should be stupid too! But people use it. Its to make it less complicated! Most people who know the basics will understand that movement of electrons cause holes to move. ∴ why complicate things!

    • @khasimali9352
      @khasimali9352 Před 3 lety +1

      @@nix324 he is right stop ur teachings to him

    • @jyotiprakashpalei4266
      @jyotiprakashpalei4266 Před 2 lety

      sir can you send me the notes ?

  • @SumanYadav-gn6fw
    @SumanYadav-gn6fw Před 3 lety +426

    Lmao!!!!the thing which i couldnt understand in 40 minutes of my class period, this guy cleared all my concept in just 14 minutes. Thank u so much for all these effort u made in preparing this topic and helping us.

    • @onnumillasummathan2611
      @onnumillasummathan2611 Před 3 lety +27

      Because students mind active only 15 to 20 mins during class hour.But you search for this video so you listen this.when we search for things then only we accept this😉

    • @abdulrahimnoor1700
      @abdulrahimnoor1700 Před 2 lety +12

      U didnt give your proper interst in class like this video. Thats why u didnt understand bro

    • @anirudhas1940
      @anirudhas1940 Před rokem +1

      That's the greatness of YT

    • @karafahmid7578
      @karafahmid7578 Před rokem +1

      Suiii

    • @praveenchaturvedi2761
      @praveenchaturvedi2761 Před rokem

      Really dude....

  • @maurosobreira8695
    @maurosobreira8695 Před 4 lety +135

    Best class I found about this topic. Thanks!

  • @yashpop7232
    @yashpop7232 Před 3 lety +65

    Very helpful. Got me full marks in my pre boards in semi conductors😍 looking forward for more such short and helful content😘😘

  • @nirmalkarthik5892
    @nirmalkarthik5892 Před rokem +26

    Amazing! I am reviewing these topics for my upcoming final and was dismayed when I realized that I had forgotten the fundamentals; however, I remembered your channel from the first time I learned it and found my way back. Not only did you make it feel intuitive, but you even left notes in the description so that we could review them after the video. Thank you so much; I will no doubt be recommending your channel to all my friends and everyone who takes this class after. This video deserves more likes.

  • @RizingEco
    @RizingEco Před 3 měsíci +41

    Diploma students assemble here >>>

  • @asaplogic6104
    @asaplogic6104 Před 5 lety +64

    Plz make an entire series on Electronic Devices and Circuits

  • @sumanthvarma1908
    @sumanthvarma1908 Před 11 měsíci +8

    Best explanation ever, spent 3 days understanding this pn junction diode
    from other videos but sir you cleared it in just 5 minutes
    Thank you so much
    crystal clear concept delivery

  • @aaryansj8016
    @aaryansj8016 Před 3 lety +26

    Your videos are very helpful for College students 🙂....!!❤️❤️

  • @faithndinda2134
    @faithndinda2134 Před 5 lety +16

    Best explanation I've seen so far.

  • @Ykotb08
    @Ykotb08 Před 2 měsíci +2

    In my university I had Genius professors but failed to deliver the great explanation as you did, thank you

  • @kosgilavanya4378
    @kosgilavanya4378 Před 3 lety +11

    Crystal clear video . All my doubts cleared in one shoot...the best video

  • @adityasaha2738
    @adityasaha2738 Před 7 měsíci +2

    00:16 PN junction is formed by doping a silicon crystal with p-type and n-type impurities
    02:13 When electrons diffuse across the junction, they create positive and negative ions near the junction.
    04:13 Electrons and holes are able to cross the depletion region due to the barrier potential created by immobile ions
    06:00 When a PN Junction is not biased, the overall current in the circuit will be zero.
    07:46 Increasing applied voltage reduces depletion region width and allows current flow.
    09:34 Movement of electrons and holes leads to current flow in forward and reverse biased PN junctions
    11:19 Reverse saturation current is a low magnitude current that flows in the reverse bias condition in a PN junction diode
    13:14 Temperature rise leads to an increase in reverse saturation current and breakdown voltage in PN Junction.
    Crafted by Merlin AI.

  • @missjain5623
    @missjain5623 Před 3 lety +3

    Very helpful 12th July is my interview ND ur channel is very helpful to recall my concept ...thanks

  • @NihalGatty
    @NihalGatty Před 10 měsíci +8

    Any EC students of first year present here 🖐️

  • @shaojunma4737
    @shaojunma4737 Před 2 lety +2

    i looked at others video on PN junction, and found this one is best.

  • @VijendraSingh-bp3sf
    @VijendraSingh-bp3sf Před 5 lety +3

    Ise kehte Hai you tube channel 💎💎💎 well done

  • @blossoms4505
    @blossoms4505 Před 3 lety +2

    Thank you soo much I was about to give up trying to understand this topic and after watching I understood this topic wasn't difficult as I thought it was

  • @srushtishelar7839
    @srushtishelar7839 Před 3 lety +1

    One of the best channel on which I had cleared my all concepts regarding p n junction diode

  • @prashantyadav7272
    @prashantyadav7272 Před 2 lety +4

    This guy is a gem.

  • @sakshi4959
    @sakshi4959 Před 16 dny +2

    I got admission in IIT but no one teaches like you , sir .
    😢

  • @rajshree3436
    @rajshree3436 Před rokem +3

    Fantastic explaination, each nd every terms r very clr. Thanks a lot bhaiya 😊

  • @dhairyaamin3775
    @dhairyaamin3775 Před 4 lety +2

    Have a science olympiad tryout today, this really helped!

  • @upgradehari2548
    @upgradehari2548 Před 2 lety +1

    explanation adhurs annayya❤️

  • @user-mf1hs4xb5p
    @user-mf1hs4xb5p Před 8 měsíci +2

    Great thanks ! you destroyed my mental block

  • @PriyanshiMehra-bn7lm
    @PriyanshiMehra-bn7lm Před 2 lety +3

    very nice....whole content explained in detail in very less time..very helpful...

  • @138_nidhimanoj5
    @138_nidhimanoj5 Před 3 lety +3

    Amazing Video .... Understood very clearly.
    Many, many thanks to you!

  • @pineapplesharm2903
    @pineapplesharm2903 Před 4 lety +6

    Loved this explanation. Thank you so much !!!

  • @riteshparmar9794
    @riteshparmar9794 Před 4 lety +2

    Best explanation ever on CZcams

  • @prodigyinmaking2166
    @prodigyinmaking2166 Před 2 lety +2

    Best class and crystal clear explanation

  • @harshans7712
    @harshans7712 Před rokem +2

    Thanks a lot sir, actually I spent lot of time reading ncert I understood till pn jnc diode where depletion region forms but while biased I couldn't understand properly, once again thank you sir

  • @keeplearningenglishwithjds7582

    Really excellent explanation...u just vanished all of my doubts regarding the topic...thanks

  • @swatisinghal8006
    @swatisinghal8006 Před 3 lety +1

    The way ko explanation is diffrnt nd gud...i really like it👍

  • @manjukaavali224
    @manjukaavali224 Před 4 lety +5

    Thank you sir , plz make more videos for us , and science students , once again thank u so much sir

  • @AvinashAvikam
    @AvinashAvikam Před 3 lety +11

    Thanks sir for excellent and easy way of learning electronics, can you provide ppts or documents for quick revision , please if you can

  • @sud1297
    @sud1297 Před 9 měsíci +1

    very nice video very helpfull love you idli dosa sir mendu wada 😀👍

  • @fleur23458
    @fleur23458 Před 7 měsíci +1

    Thankyou so much sir your videos help me a lot in understanding concepts❤❤

  • @PkMath-e1v
    @PkMath-e1v Před 3 lety +1

    Wherever u live. May allah bless u and make your life happy. U are so helpful.

  • @guest7329
    @guest7329 Před 4 měsíci +1

    hey man, I don't know why you do this, but thanks you❤

  • @nileshmondal6886
    @nileshmondal6886 Před 5 lety +8

    Thank you sir, for give us this lecture.

  • @futuremedico3647
    @futuremedico3647 Před 2 lety +2

    Amazing amazing and amazing
    Short and superb 🙏

  • @revanthpatil56
    @revanthpatil56 Před 4 lety +4

    Concise and precise.
    Awesome 👍👌👏

  • @srikanthdasari751
    @srikanthdasari751 Před 3 lety +2

    Iam satisfied with your lecture sir thank you keep uploading further videos

  • @panayiotismichaelides3148

    Very informative and inutitive video. The pn-junction was a very ambiguous and hard to understand concept for me .After watching your first 3 videos I feel I have a much better understanding. Thankyou so much, heading over to watch the rest of your videos about bipolar transistors and mosfets. Keep up the good work!

  • @thedeadzonegaming9001
    @thedeadzonegaming9001 Před rokem +1

    You got best teaching skills sir ❤❤

  • @sneha4288
    @sneha4288 Před 5 lety +4

    Very clear explanation... Expecting more videos like this

  • @VLe0
    @VLe0 Před 4 lety +2

    Thanks. This helps me understand the operation of diodes. Best explanation.

  • @asadullahchuhan9405
    @asadullahchuhan9405 Před 3 lety +2

    Thanks for Beautiful explanation🌷

  • @zaper2705
    @zaper2705 Před rokem +1

    Understood the concept finally les go

  • @gauri7531
    @gauri7531 Před 3 lety +1

    Best explaination in short time thanks

  • @ssrilikith4136
    @ssrilikith4136 Před 4 lety +2

    best class forever

  • @vijayakumari1290
    @vijayakumari1290 Před 3 lety +1

    Explanation is so good and I like it

  • @undisputedbunny9919
    @undisputedbunny9919 Před rokem +4

    Legends are watching after 2years of clearing class 12 😭

  • @mailafernandez2116
    @mailafernandez2116 Před rokem +1

    Thanks for helping me to understand my subject, always keep safe, Friend. To more educational video 🤙🔥

  • @godfred3597
    @godfred3597 Před 4 lety +3

    Great explanation

  • @arafathossen3066
    @arafathossen3066 Před 2 lety +1

    From Bangladesh... Take love❤️❤️

  • @safwanuddin8888
    @safwanuddin8888 Před 2 lety +2

    Does the built-in potential refer to the voltage of the depletion region? Meaning is the voltage difference 0? Otherwise negative charge may flow. So does the potential of the to edges of the depletion region same (0.7 V) ?

  • @dhruvchoudhary7966
    @dhruvchoudhary7966 Před 5 měsíci

    So simple and effective, very nice explaination👍

  • @sanjeev8255
    @sanjeev8255 Před 3 lety +1

    Your teaching excellent sir thank you

  • @clementj789
    @clementj789 Před 4 lety +5

    Hello
    Is the barrier potential the same thing as the threshold voltage you described in the VI characteristics of diodes?
    Thanks

  • @dhairyshrivastava988
    @dhairyshrivastava988 Před 3 lety +2

    Cant thanku enough for this

  • @ahmedel-saadany703
    @ahmedel-saadany703 Před rokem +2

    ياخى شكرا والله مش عارف من غيركوا كنت عملت ايه
    انتوا تيجوا تشرحوا فى الكلية احسن 😂

  • @urmilareddy6047
    @urmilareddy6047 Před 2 lety +1

    Marvelous explanation sir.. Thank you

  • @kakalimukherjee3297
    @kakalimukherjee3297 Před 4 lety +1

    One of the best explanations on CZcams

  • @ozzyfromspace
    @ozzyfromspace Před 4 lety +5

    That was such a phenomenal explanation! I finally have a mental model of PN junctions. Thank you! 🥳🙏🏽🎊🙌🏽

  • @aneenaabraham18
    @aneenaabraham18 Před 10 měsíci +1

    very good explanation

  • @amnaajmal999
    @amnaajmal999 Před 3 lety +1

    Best lecture ever understood.

  • @venkataramana2058
    @venkataramana2058 Před 4 lety +2

    I got clarity about p-n junction sir but I have 1doubt-in n-type why can't pentavalent excess atom form 5th bond with si

  • @chellaboyinadivyasri
    @chellaboyinadivyasri Před 2 lety

    Tq sm.. explaining in english is very much useful 👍👍

  • @poojapawar5222
    @poojapawar5222 Před 4 lety +1

    Nice teaching sir👌🏼👌🏼please keep making vedios👍👍👍

  • @gaurisharma2120
    @gaurisharma2120 Před 5 lety +2

    thank you sir...nice channel for electronics student

  • @electric_deer2007
    @electric_deer2007 Před 2 lety +1

    nice !! this is ver helpful for my class 12 !

  • @neetuchauhan160
    @neetuchauhan160 Před 2 lety +1

    U are seriously tooooo goood🥰🥰🥰😇🙏Awesome lecture

  • @dee341souravmaity5
    @dee341souravmaity5 Před 3 lety +2

    Best CLASS that I am ever seen on this subject

  • @SatishSatish-ki9mq
    @SatishSatish-ki9mq Před 2 lety +1

    Super 👍👍Anya Vara laga nakee vahernam hjrw bagalfr nkal jrsh 👍👍

  • @abhinavbhushan5415
    @abhinavbhushan5415 Před 3 lety +1

    Thanks for such a beautiful explation.

  • @samayrakapoor475
    @samayrakapoor475 Před 4 měsíci +1

    U saved usss... thnkuu ❤❤

  • @subhrajitghosh7017
    @subhrajitghosh7017 Před 4 lety +1

    Just wonderful!!!.....Best explanation ever

  • @jeromeshanodaniel553
    @jeromeshanodaniel553 Před 2 lety

    Best class for the topic ,No doubt

  • @shizamplayzyt7567
    @shizamplayzyt7567 Před rokem +1

    WOW,very well explained,I subscribed and liked your video and turned on notification button to all for more videos😍

  • @sandip_kanzariya8476
    @sandip_kanzariya8476 Před 2 lety +2

    Jordar 👌👌👌👌

  • @miryasadanandam5661
    @miryasadanandam5661 Před 2 měsíci

    Wonderful class❤

  • @jefferyaustin1571
    @jefferyaustin1571 Před 2 lety +1

    How do minority carriers(holes and electrons) get swept across Depletion Region due to electric field?

  • @dmitriybelman9504
    @dmitriybelman9504 Před 5 lety +2

    very good explanation. thank you

  • @akashkedia4618
    @akashkedia4618 Před rokem

    Extremely good explanation.

  • @maityamit2003
    @maityamit2003 Před 2 lety +1

    After 1 week we have Pre University Test and I am watching this 🌹🥰🥰🌹

  • @info-hub457
    @info-hub457 Před 11 měsíci +1

    The lecture is great and all points are conveyed but if you don't mind me saying, its hard to understand your reading way of communication. It feels like someone is reading lines from a book

  • @bruhbruh4137
    @bruhbruh4137 Před rokem +1

    Nice , i liked this diode 😀

  • @nhuphan6969
    @nhuphan6969 Před 2 lety +1

    great explanation!!!

  • @JubileeQuaye-fr8tm
    @JubileeQuaye-fr8tm Před 25 dny +1

    Bruh is just great 👍

  • @kashfiaaktermithila3150
    @kashfiaaktermithila3150 Před 2 lety +1

    God bless you..!

  • @vinayakojha6977
    @vinayakojha6977 Před 4 lety +2

    Best explanation ❣️

  • @twinobusiingyerabecca1429

    I have enjoyed the topic really,nice explanation

  • @Prathiksha-mr7wr
    @Prathiksha-mr7wr Před 5 měsíci

    Wowww excellent teaching👏👏

  • @sambhavchaudhary6344
    @sambhavchaudhary6344 Před 2 lety +1

    best explaination

  • @robertocardenosa493
    @robertocardenosa493 Před 2 lety +1

    I would like to?
    Thank you for the video.
    It was a very helpful?
    Explanation.

  • @playitback-os7mh
    @playitback-os7mh Před 2 lety +1

    Great Video!!

  • @anushreey3390
    @anushreey3390 Před 3 lety

    Your video was of great help😁.Thank u

  • @ambatisivaji1807
    @ambatisivaji1807 Před 3 lety +1

    Hai sir plz provide all types of "ELECTRONIC CALICULATIONS "
    * ITI - ELECTRONICS MECHANIC * CALICULATIONS... PLZ provide sir more waiting for ALL " ITI " STUDENTS,,,,,,,,,,,,,,,,,,,,,,,

  • @huseyindenkalan4
    @huseyindenkalan4 Před 2 lety

    superb explanation. thank you very much !