Publisher : The Korean Institute of Surface Engineering
DOI : 10.5695/JKISE.2011.44.4.165
Title & Authors
A Study on the Holding of LED Sapphire Substrate Using Alumina Electrostatic Chuck with Fine Electrode Pattern Kim, Hyung-Ju; Shin, Yong-Gun; Ahn, Ho-Kap; Kim, Dong-Won;
In this work, handling of sapphire substrate for LED by using an electrostatic chuck was studied. The electrostatic chuck consisted of alumina dielectric, which was doped with 1.2 wt% . As the volume resistivity of alumina dielectric was decreased, the electrostatic force was increased by Johnsen-Rahbek effect. The narrower width and gap size of electrode led to the stronger electrostatic force. When alumina dielectric with resistivity and 3 mm width/1.5 mm gap sized electrode was used, the strongest electrostatic force in this work was obtained, which value reached to ~14.46 gf/ at 2.5 kV for 4-inch sapphire substrate. This results show that alumina electrostatic chuck with low resistivity and fine electrode pattern is suitable for handling of sapphire substrate for LED.