Improved Reliability of 278 nm Deep Ultraviolet AlGaN-Based Flip-Chip Light Emitting Diodes by Using ITO/Al Contact
- Authors
- Yum, Woong-Sun; Lee, Sang-Youl; Lim, Hyun-Soo; Choi, Rak-Jun; Oh, Jeong-Tak; Jeong, Hwan-Hee; Seong, Tae-Yeon
- Issue Date
- 1-4월-2021
- Publisher
- ELECTROCHEMICAL SOC INC
- Keywords
- Deep ultraviolet light-emitting diode; AlGaN contact layer; ITO; Al; Ni; Au; contact
- Citation
- ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY, v.10, no.4
- Indexed
- SCIE
SCOPUS
- Journal Title
- ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
- Volume
- 10
- Number
- 4
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/128275
- DOI
- 10.1149/2162-8777/abf0e9
- ISSN
- 2162-8769
- Abstract
- We investigated the electrical and optical performance and reliability of 278 nm deep ultraviolet (DUV) AlGaN-based flip-chip light-emitting diodes (FCLEDs) fabricated with ITO/Al and reference Ni/Au contacts. The DUV FCLEDs with the Ni/Au and ITO/Al contacts yielded forward voltages of 6.52 and 6.65 V at 50 A cm(-2) and light output of 6.36 and 10.06 mW at 50 A cm(-2), respectively. The ITO/Al-based FCLEDs produced higher Wall plug efficiency (WPE) (3.04% at 50 A cm(-2)) than the Ni/Au-based samples (1.96%). The ITO/Al-based FCLEDs revealed 55% higher WPE at 50 A cm(-2) than the Ni/Au-based sample. For both of the samples, the output power decreased with increasing operation time at 100 A cm(-2). For example, after 2000 h, the Ni/Au and ITO/Al-based FCLEDs showed a reduction in the output power by 37% and 22%, respectively. Despite the good output characteristics, the ITO/Al contact-based FCLEDs exhibited higher forward bias voltages than the Ni/Au-based sample. Based on the energy dispersive X-ray spectroscopy (EDS) depth profiles, high-angle annular dark field (HAADF), and electron energy loss spectroscopy (EELS) results, reason for the increase in the forward voltage of ITO/Al-based FCLEDs is described and discussed.
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Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
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