Optimization of a SiOx / SiNxOyCz multilayer structure for a reliable gas diffusion

Abstract

Thin film encapsulation (TFE) using a multilayer film composed of SiOx and SiNxOyCz layers deposited by plasma-enhanced atomic layer deposition is demonstrated. To investigate the mechanism of suppressed moisture penetration for the multilayer film, chemical analyses were performed using Fourier transform infrared and Auger electron spectroscopy, and the encapsulation ability was evaluated using the water vapor transmission rate (WVTR). The encapsulation ability of the multilayer film is affected by the nitrogen content in the SiNxOyCz layer and the number of interfaces in the multilayer film. Consequently, TFE using a multilayer film of 20-nm-SiNxOyCz/ 20-nm-SiOx/ 20-nm-SiNxOyCz resulted in excellent encapsulation ability, with a WVTR of 7.63 x 10-4 g m-2 day-1.