Presentación de PowerPoint

Presentación de PowerPoint

1 Diodos 1.1.1 Semiconductores Contaminados P y N Definicin

Son componentes basados en la propiedad de ciertos materiales como el silicio, el germanio, el sulfuro de cadmio y el arseniuro de galio entre otros; y tienen la particularidad de comportarse indistintamente como conductores o aislantes bajo determinadas condiciones externos o estmulos; de all que se dice que sus caractersticas son

dependientes de factores de la naturaleza, como la luz, la temperatura, campos magnticos, etc. En Donde Podemos ver Esto? En electrnica los semiconductores ms usados tocados por el hombre son los diodos, transistores,

Tiristores, y los circuitos integrados; todos construidos principalmente a base de silicio. La caracterstica principal de los semiconductores que los distingue de los conductores y aislantes es su estructura atmica. Los conductores como el cobre, la plata y el oro,

tiene pocos electrones en la rbita de valencia, justamente 1, los cuales son atrados dbilmente por el ncleo del tomo. Entonces, bajo la influencia de fuerzas externas, dicho electrn de valencia puede escapar fcilmente del tomo, pasando as a ser un electrn libre que viaja a travs del material y propicia junto a otros similares el establecimiento de

corrientes elctricas. Por su parte los aislantes relativamente tienen muchos electrones de valencia, tpicamente 8, y los mismos estn fuertemente ligados al ncleo del tomo. Entonces resulta muy difcil convertirlos en electrones libres y obligarlos a participar en la

creacin de corrientes elctricas.

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