Optical devices featuring textured semiconductor layers

H - Electricity – 01 – L

Patent

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H01L 33/00 (2006.01)

Patent

CA 2627880

A semiconductor sensor, solar cell or emitter, or a precursor therefor, has a substrate and one or more textured semiconductor layers deposited onto the substrate. The textured layers enhance light extraction or absorption. Texturing in the region of multiple quantum wells greatly enhances internal quantum efficiency if the semiconductor is polar and the quantum wells are grown along the polar direction. Electroluminescence of LEDs of the invention is dichromatic, and results in variable color LEDs, including white LEDs, without the use of phosphor.

L'invention concerne un capteur, une pile solaire ou un émetteur à semi-conducteurs, ou un précurseur de ceux-ci, comprenant un substrat et une ou plusieurs couches à semi-conducteurs texturées déposées sur le substrat. Les couches texturées améliorent l'extraction ou l'absorption de la lumière. La texturation de la zone formée de multiples puits quantiques améliore de manière significative l'efficacité quantique interne si le semi-conducteur est polaire et les puits quantiques sont formés le long de la direction polaire. L'électroluminescence des DELs de l'invention est dichromatique, et permet d'obtenir des DELs de couleur variable, y compris des DELs blanches, sans utiliser de phosphore.

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