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SILICON CRYSTAL Light is absorbed in o 土 Hale silicon crystal by liberating Elechee free-ro-move negative HOWTHE + charges, called electrons and free-to-move posiive BELL SOLAR BATTERY charges, called holes. WORKS E ELECTEIC FELD un An electrie Rald exers a ++++++++++ force on charged partidoe causing them to move ifthey are freeThe force moves holes in one dlrectiongand electronsintheoppo direction. SILICON P-N JUNCTION Ziectren Rich Berriar ar Male Biel When the light is absorbed, freeing electrons and siicor Eectric Fied Silcon In a thin borfier af the holesin thc barrierregionofpnjuncionthebuilin ++++++++ junetion betwcen ain eleetron ++++++++ electric fleld forces the holas into the p side, moking +++++++ rich n-regionand a hol it posilive, and the clecrons into the n-side, moking ricn p-reglon in a silicon crys. it negalive This dieplocement of the newly freed fal, o strong built-i...