Author(s) Park, J.S.; Kim, J.H.; Kim, J.Y.; Kim, D.H.; Na, J.Y.; Kim, S.K.; Kang, D.; Seong, T.Y.
Journal Nanotechnology
Date Published 2017 Jan 27

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 μm 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 Ω sq(-1)) than the ITO-only film (950 Ω sq(-1)). LEDs (chip size: 300 × 800 μm(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 nm-thick 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.

DOI 10.1088/1361-6528/28/4/045205
ISSN 1361-6528
Citation Nanotechnology. 2017;28(4):045205.

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