Any PN junction is sensitive to light. It's why diodes and chips are in opaque packaging (unless interaction with external light is intentional).<p>Raspberry Pis from around 2015 can be crashed with a flash of light from a xenon bulb, as the packing on a power supply chip was not opaque enough.<p><a href="https://www.zdnet.com/article/raspberry-pi-2-power-crashes-when-exposed-to-xenon-flash/" rel="nofollow">https://www.zdnet.com/article/raspberry-pi-2-power-crashes-w...</a>