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--- eeng:topics:diodes:start [2022/12/08 07:24] – [Intro to semiconductors | Class 12 (India) | Physics | Khan Academy] rolf
+++ eeng:topics:diodes:start [2023/12/13 17:11] (current) – rolf
@@ Line 3: / Line 3: @@
 ====== Diodes ======
+A [[https://en.wikipedia.org/wiki/Diode|diode]] is semiconductor device consisting of a **PN-junction**. It circuits it works like a current valve in which the current is only flowing if the external diode voltage is in forward direction, aka forward (voltage) bias. In the reverse bias mode the diode blocks and (almost) no current can flow.
+The diode current dependance on diode voltage can be described in the (simplifying) [[https://en.wikipedia.org/wiki/Shockley_diode_equation|Shockley diode equation]] (not describing the diode breakdown):
+$
+I_D(V_D) = I_S (e^{V_D/(n V_T)} -1)
+$
+$n$ is the ideality factor.
+$
+V_T = kT/q
+$
+$T$: PN junction temperature, $q$: elementary charge, $k$: Boltzmann constant.
+| {{https://upload.wikimedia.org/wikipedia/commons/thumb/2/2a/Diode_current_wiki.png/1004px-Diode_current_wiki.png?500&direct}} |
+| Fig.: I–V (current vs. voltage) characteristics of a p–n junction diode ([[https://en.wikipedia.org/wiki/Diode#/media/File:Diode_current_wiki.png|Wikipedia]]) |
 ===== Intro to semiconductors | Class 12 (India) | Physics | Khan Academy =====
-A diode is semiconductor device consisting of a **PN-junction**. The **Khan Academy India** provides an excellent and very clear introduction on highschool level.
+The **Khan Academy India** provides an excellent and very clear introduction on highschool level.
 Have a look at the YT playlist on :!:
@@ Line 18: / Line 32: @@
 | {{youtube>Ekm2hhcrgCw?}} |
-| [[https://www.youtube.com/watch?v=Ekm2hhcrgCw&list=PL2ub1_oKCn7ogaMtdB2RumlIYqNeXf_oX&index=5|Link with full playlist]] |
+| Intrinsic semiconductors. [[https://www.youtube.com/watch?v=Ekm2hhcrgCw&list=PL2ub1_oKCn7ogaMtdB2RumlIYqNeXf_oX&index=5|Link with full playlist]] |
 | {{youtube>JRf2VuwBVvs?}} |
-|      [[https://www.youtube.com/watch?v=JRf2VuwBVvs&list=PL2ub1_oKCn7ogaMtdB2RumlIYqNeXf_oX&index=10|Link with full playlist]] |
+| The PN junction. [[https://www.youtube.com/watch?v=JRf2VuwBVvs&list=PL2ub1_oKCn7ogaMtdB2RumlIYqNeXf_oX&index=10|Link with full playlist]] |
 ===== Semiconductor Physics by Jordan Edmunds =====