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Proceedings Paper

Developments in AlGaN and UV-C LEDs grown on SiC
Author(s): Burhan SaifAddin; Christian J. Zollner; Abdullah Almogbel; Humberto Foronda; Feng Wu; Abdulrahman Albadri; Ahmed Al Yamani; Michael Iza; Shuji Nakamura; Steven P. DenBaars; James S. Speck
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Paper Abstract

AlGaN-based UV-C LEDs (260-300 nm) remain inefficient compared to InGaN visible LEDs due to optically absorptive layers limiting light extraction, optical polarization, and poor material quality. Sapphire, the most popular substrate material, is transparent and inexpensive but has many disadvantages in material quality and device performance. In contrast, SiC has small lattice mismatch with AlN (~1%), similar crystal structure, more chemically stable and contains no oxygen, which degrades the IQE and compensates holes. We report low threading dislocations density (TDD) AlN on SiC (TDD < 7x108cm-2) by metalorganic chemical vapor deposition (MOCVD). We demonstrate innovative thin-film flipchip (TFFC) LEDs with 7.8 mW at 95 mA at 278.5 nm grown on AlN/SiC with TDD~1x109 cm-2. (Respectively, EQE and WPE are 1.8% and 0.6%.) We also demonstrate that KOH roughening does not impact the IV voltage of TFFC LED. KOH roughening enhanced the light extraction efficiency (LEE) by 100% and ~180% for UV LEDs with 10 nm p-GaN and 5 nm p-GaN, respectively.

Paper Details

Date Published: 15 February 2018
PDF: 10 pages
Proc. SPIE 10554, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XXII, 105541E (15 February 2018); doi: 10.1117/12.2317660
Show Author Affiliations
Burhan SaifAddin, Univ. of California, Santa Barbara (United States)
Christian J. Zollner, Univ. of California, Santa Barbara (United States)
Abdullah Almogbel, Univ. of California, Santa Barbara (United States)
Humberto Foronda, Univ. of California, Santa Barbara (United States)
Feng Wu, Univ. of California, Santa Barbara (United States)
Abdulrahman Albadri, King Abdulaziz City for Science and Technology (Saudi Arabia)
Ahmed Al Yamani, King Abdulaziz City for Science and Technology (Saudi Arabia)
Michael Iza, Univ. of California, Santa Barbara (United States)
Shuji Nakamura, Univ. of California, Santa Barbara (United States)
Steven P. DenBaars, Univ. of California, Santa Barbara (United States)
James S. Speck, Univ. of California, Santa Barbara (United States)


Published in SPIE Proceedings Vol. 10554:
Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XXII
Jong Kyu Kim; Michael R. Krames; Martin Strassburg; Li-Wei Tu, Editor(s)

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