How We Learned to Make Power from Light | The First Solar Cell (Bell Labs 1954)

In April 1954, in New Jersey, a toy Ferris wheel began to turn with no battery, no plug and no fuel: just a small panel of silicon cells held up to the sun. This is the story of the first practical solar cell: Becquerel's discovery in 1839, the selenium clues of the 1870s, Charles Fritts's gold-and-selenium cell, Einstein's photons, Russell Ohl's cracked silicon rod, the Bell Labs team of Chapin, Fuller and Pearson, how a silicon cell actually works, why it was far too expensive on Earth, and how Vanguard 1 took it to space. Drawn as a living blueprint. CHAPTERS 0:00 A Ferris wheel that ran on sunlight 0:33 1839: Becquerel sees light make current 1:10 Selenium: Smith, Adams & Day, Fritts 1:51 Einstein and the photon, 1905 2:21 Russell Ohl's cracked silicon, 1940 3:00 Chapin, Fuller and Pearson at Bell Labs 3:50 How a solar cell works 4:33 April 1954: the Bell Solar Battery 5:04 Americus, 1955, and $286 a watt 5:35 Vanguard 1: saved by space 6:18 Solar power today 6:50 Next: the telegraph Anecdotes are marked: the "first sun-powered phone call" in Americus is as reported at the time; the $286-a-watt price and the million-dollar house are estimates. Previous episode: Atomic Power. Next episode: the telegraph. Behind The First: the story behind the things we use. SOURCES Edmond Becquerel (Wikipedia; Comptes rendus 1839); W. Smith, Nature 1873; Adams & Day, Proc. Royal Society 1876; Charles Fritts (APS News); Nobel Prize in Physics 1921 (nobelprize.org); Discovery of the p-n junction (Computer History Museum; ETHW); "April 25, 1954: Bell Labs Demonstrates the First Practical Silicon Solar Cell" (APS News); IEEE Milestone: First Practical Photovoltaic Solar Cell (ETHW); Americus solar telephone (historical marker, HMdb); "Saved by the Space Race" (John Perlin, Solar Today); Vanguard 1 (Wikipedia; Linda Hall Library; IEEE Spectrum); Ember Global Electricity Review 2025. IMAGE CREDITS (Wikimedia Commons) Edmond Becquerel by Nadar.jpg (Public domain) https://commons.wikimedia.org/wiki/Fi... 1839 Becquerel MemoireSurLesEffetsElectriques.png (Public domain) https://commons.wikimedia.org/wiki/Fi... Willoughby Smith.jpg (Public domain) https://commons.wikimedia.org/wiki/Fi... WilliamGryllisAdams.jpg (Public domain) https://commons.wikimedia.org/wiki/Fi... Einstein patentoffice full.jpg (Public domain) https://commons.wikimedia.org/wiki/Fi... Einstein 1921 by F Schmutzer - restoration.jpg (Public domain) https://commons.wikimedia.org/wiki/Fi... SolarModul 1954.jpg (Public domain) https://commons.wikimedia.org/wiki/Fi... Vanguard 1.jpg (Public domain) https://commons.wikimedia.org/wiki/Fi... A team of Vanguard I scientists mount the satellite in the rocket.jpg (Public domain) https://commons.wikimedia.org/wiki/Fi... Samuel Morse 1840.jpg (Public domain) https://commons.wikimedia.org/wiki/Fi... Music: original tracks by the channel. Narration: synthetic voice (Microsoft Azure neural TTS).