Optical in situ monitoring of plasma-enhanced atomic layer deposition process

An optical in situ process monitoring method for the early detection of anomalies in plasma process equipment is presented. Cyclic process steps of precursor treatment and plasma reaction for the deposition of an angstrom-scale film increase their complexity to ensure the process quality. However, a...

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Veröffentlicht in:Japanese Journal of Applied Physics 2018-06, Vol.57 (6S2), p.6
Hauptverfasser: Arshad, Muhammad Zeeshan, Jo, Kyung Jae, Kim, Hyun Gi, Hong, Sang Jeen
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container_issue 6S2
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container_title Japanese Journal of Applied Physics
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creator Arshad, Muhammad Zeeshan
Jo, Kyung Jae
Kim, Hyun Gi
Hong, Sang Jeen
description An optical in situ process monitoring method for the early detection of anomalies in plasma process equipment is presented. Cyclic process steps of precursor treatment and plasma reaction for the deposition of an angstrom-scale film increase their complexity to ensure the process quality. However, a small deviation in process parameters, for instance, gas flow rate, process temperature, or RF power, may jeopardize the deposited film quality. As a test vehicle for the process monitoring, we have investigated the aluminum-oxide (Al2O3) encapsulation process in plasma-enhanced atomic layer deposition (PEALD) to form a moisture and oxygen diffusion barrier in organic-light emitting diodes (OLEDs). By optical in situ monitoring, we successfully identified the reduction in oxygen flow rates in the reaction steps, which resulted in a 2.67 times increase in the water vapor transmission ratio (WVTR) of the deposited Al2O3 films. Therefore, we are convinced that the suggested in situ monitoring method is useful for the detection of process shifts or drifts that adversely affect PEALD film quality.
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subjects Aluminum oxide
Anomalies
Atomic layer epitaxy
Diffusion barriers
Diffusion layers
Flow velocity
Gas flow
Monitoring
Organic light emitting diodes
Plasma
Process parameters
Test vehicles
Water vapor
title Optical in situ monitoring of plasma-enhanced atomic layer deposition process
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