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Cheng-Yi Fang, Yu-Lun Liu, Yang-Chun Lee, Hsuen-Li Chen, De-Hui Wan and Chen-Chieh Yu Nanoparticle Stacks with Graded Refractive Indices Enhance the Omnidirectional Light Harvesting of Solar Cells and the Light Extraction of Light-Emitting Diodes Advanced Functional Materials 23

Version of Record online: 16 OCT 2012 | DOI: 10.1002/adfm.201201949

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Nanoparticles (NPs) enhance both the omnidirectional light harvesting of solar cells and the light extraction of light-emitting diodes (LEDs). The photocurrent of silicon-based solar cells can be significantly improved omnidirectionally using an optical gradient of a NP stack and the light-extraction efficiency of LEDs can also be enhanced, due to both the graded refractive index and the moderate surface roughness.

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