==pn-overgang anekdoter==
===Utilsigtet fotodiodevirkning===
[[Raspberry Pi 2]] fra 2015 har en lille regulatorkreds, som er gennemsigtig for lys. Det resulterer i at Raspberry Pi 2 går ned hvis den bliver [[xenon-blitz]]et - andre skriver, at Raspberry Pi 2 er blitz- og laser-sky.<ref>[http://www.version2.dk/artikel/blitz-kan-crashe-raspberry-pi-2-77068 10. februar 2015, version2.dk: Blitz kan crashe Raspberry Pi 2]</ref><ref>[http://www.raspberrypi.org/xenon-death-flash-a-free-physics-lesson/ raspberrypi.org: Xenon Death Flash: a free physics lesson] {{Webarchive|url=https://web.archive.org/web/20150317073901/http://www.raspberrypi.org/xenon-death-flash-a-free-physics-lesson/ |date=17. marts 2015 }} Citat: "...Importantly, it’s ONLY really high-intensity bursts like xenon flashes and laser pointers that will cause the issue. Other bright lights – even camera flashes using other technologies – won’t set it off...This component that’s causing the issue is in a WL-CSP package: a bare [[Halvleder-mikrochip|silicon die]] which has solder balls attached...Silicon junctions (the types that are responsible for making diodes and transistors and other such electronic miracles function) can be ‘upset’ by this photoelectric effect if it is large enough (i.e. if enough light of the right energy [i.e. colour] is fired at them). This seems to be what is happening to our power supply chip..."</ref> Det skyldes fotodiode- og solcelle-effekten og bevirker at regulatorkredsen slukker processoren, ved kraftig infrarød belysning.
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