${\rm Ga}_{2}{\rm O}_{3}{:}{\rm ITO}$ Transparent Conducting Electrodes for Near-Ultraviolet Light-Emitting Diodes

Abstract

Herein, a Ga <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> -based indium tin oxide (Ga <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> :ITO) thin film is proposed as a replacement for ITO in near-ultraviolet light-emitting diodes (NUV LEDs), and its electrical and optical properties are optimized. The measured sheet resistance and optical transmittance of the Ga <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> :ITO thin film were 49 Ω/sq and 93.8% at 405 nm wavelength after optimization, whereas those of ITO films were 52 Ω/sq and 84.4% at that wavelength, respectively. In addition, we found that at 20 mA the output power of the NUV LEDs with Ga <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> :ITO top electrodes was 55% greater than that of those with ITO top electrodes.