Less strained and more efficient GaN light-emitting diodes with embedded silica hollow nanospheres

Jonghak Kim, Heeje Woo, Kisu Joo, Sungwon Tae, Jinsub Park, Daeyoung Moon, Sung Hyun Park, Junghwan Jang, Yigil Cho, Jucheol Park, Hwankuk Yuh, Gun Do Lee, In Suk Choi, Yasushi Nanishi, Heung Nam Han, Kookheon Char, Euijoon Yoon

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

Light-emitting diodes (LEDs) become an attractive alternative to conventional light sources due to high efficiency and long lifetime. However, different material properties between GaN and sapphire cause several problems such as high defect density in GaN, serious wafer bowing, particularly in large-area wafers, and poor light extraction of GaN-based LEDs. Here, we suggest a new growth strategy for high efficiency LEDs by incorporating silica hollow nanospheres (S-HNS). In this strategy, S-HNSs were introduced as a monolayer on a sapphire substrate and the subsequent growth of GaN by metalorganic chemical vapor deposition results in improved crystal quality due to nano-scale lateral epitaxial overgrowth. Moreover, well-defined voids embedded at the GaN/sapphire interface help scatter lights effectively for improved light extraction, and reduce wafer bowing due to partial alleviation of compressive stress in GaN. The incorporation of S-HNS into LEDs is thus quite advantageous in achieving high efficiency LEDs for solid-state lighting.

Original languageEnglish (US)
Article number3201
JournalScientific reports
Volume3
DOIs
StatePublished - Nov 21 2013

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