Formation of an indium tin oxide nanodot/Ag nanowire electrode as a current spreader for near ultraviolet AlGaN-based light-emitting diodes
- Authors
- Park, Jae-Seong; Kim, Jae-Ho; Kim, Jun-Yong; Kim, Dae-Hyun; Na, Jin-Young; Kim, Sun-Kyung; Kang, Daesung; Seong, Tae-Yeon
- Issue Date
- 27-Jan-2017
- Publisher
- IOP PUBLISHING LTD
- Keywords
- Ag nanowire; ITO nanodot; NUV light-emitting diode; current spreading
- Citation
- NANOTECHNOLOGY, v.28, no.4
- Indexed
- SCIE
SCOPUS
- Journal Title
- NANOTECHNOLOGY
- Volume
- 28
- Number
- 4
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/84867
- DOI
- 10.1088/1361-6528/28/4/045205
- ISSN
- 0957-4484
- Abstract
- Indium tin oxide (ITO) nanodots (NDs) were combined with Ag nanowires (Ag NWs) as a p-type electrode in near ultraviolet AlGaN-based light-emitting diodes (LEDs) to increase light output power. The Ag NWs were 30 +/- 5 nm in diameter and 25 +/- 5 mu m in length. The transmittance of 10 nm-thick ITO-only was 98% at 385 nm, while the values for ITO ND/Ag NW were 83%-88%. ITO ND/Ag NW films showed lower sheet resistances (32-51 Omega sq(-1)) than the ITO-only film (950 Omega sq(-1)). LEDs (chip size: 300. x. 800 mu m(2)) fabricated using. the ITO NDs/Ag NW electrodes exhibited higher forward-bias voltages (3.52-3.75 V at 20 mA) than the LEDs with the 10 nm-thick ITO-only electrode (3.5 V). The LEDs with ITO ND/Ag NW electrodes yielded a 24%-62% higher light output power (at 20 mA) than those with the 10 nmthick ITO-only electrode. Furthermore, finite-difference time-domain (FDTD) simulations were performed to investigate the extraction efficiency. Based on the emission images and FDTD simulations, the enhanced light output with the ITO ND/Ag NW electrodes is attributed to. improved current spreading and better extraction efficiency.
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Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
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