Why all solar panels are secretly LEDs (and all LEDs are secretly solar panels)

Steve Mould0 HN recommenders · 2022–2024
2.5M views · explainer · evergreen · Uploaded 2019-02-04

Steve Mould shows that LEDs and solar panels are both diodes made from semiconductors, so a solar panel can emit light and an LED can generate electricity. He demonstrates a small solar panel lighting up.

Cited as a neat demonstration that diodes work in both directions in semiconductor and LED discussions.

Watch on YouTube

3 comments from Hacker News

@magicalhippo2022 · in “Semiconductors are more than just processors and GPUs”

Steve Mould had a video[1] about this a couple of years ago where he shows a small solar panel lighting up. [1]: [VIDEO]

@itishappy2024 · in “Europe's solar power surge hits prices, exposing storage needs”

> You can't make a sink out of it in any way. Sure you can, just drive 'em at a higher reverse voltage and they'll emit IR light instead. [VIDEO]

@hawski2024 · in “Phased Array Microphone (2023)”

Steve Mould of Youtube fame did this: Why all solar panels are secretly LEDs (and all LEDs are secretly solar panels) - [VIDEO]