More on practical solutions to eliminate reticle haze and extend reticle life in the production environment: specially designed RSPs, internal POD purifiers, and XCDA purged reticle stockers

Abstract

Use of specially designed reticle SMIF pods (RSPs) - with unique purge flow, internal dual-capture mechanism purifiers and an ultra-low humidity CDA purging system- have provided a practical solution to eliminate reticle haze for the useful life of the reticle in production environments. Prior publications, Kishkovich et al., described newly understood mechanisms of reticle haze formation based on chemical modification of quartz and chrome surfaces and have proposed solutions based on continual purge of the reticle environment with ultra-low humidity purified air [1]. In further publications they reported successful application of this solution in the field on single reticle-pod purge systems. [2] In this paper we provide guidance and advice for high volume manufacturing haze control practitioners, describing some challenges and solutions implemented on reticle stocker equipment, including considerations for materials of construction, purge flow levels and regulation, in-pod moisture/chemical purifiers, and on-tool flow measurement techniques.