Enhanced optical power and low forward voltage of GaN-based light-emitting diodes with Ga-doped ZnO transparent conducting layer

Tae-Young Park; Yong-Seok Choi; Jang-Won Kang; Jae-Ho Jeong; Seong-Ju Park; Dong Min Jeon; Je Won Kim; Yong Chun Kim
February 2010
Applied Physics Letters;2/1/2010, Vol. 96 Issue 5, p051124
Academic Journal
Ga-doped ZnO (ZnO:Ga) films were grown by metalorganic chemical vapor deposition as transparent conducting layers for GaN light-emitting diodes (LEDs). The forward voltage of LEDs with ZnO:Ga was 3.3 V at 20 mA. The low forward voltage was attributed to the removal of a resistive ZnGa2O4 phase, decreased resistivity of ZnO:Ga films, and increased hole concentration in p-GaN by thermal annealing process. The light output power of LEDs with ZnO:Ga was increased by 25% at 20 mA compared to that of LEDs with Sn-doped indium oxide due to the enhanced transmittance and the increased hole concentration in p-GaN.


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