New BARC materials for the 65-nm node in 193-nm lithography

Neef, Charles J.; Krishnamurthy, Vandana; Nagatkina, Mariya I.; Bryant, Evan; Windsor, Michelle; Nesbit, Cheryl

doi:10.1117/12.535423

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“…Etch rates of BARC films depend on all the components within the formulation, however, the polymer which has the highest solid weight content is believed to have the most impact. Understanding how polymer structure, chemical bonding and chemical elements that comprise the polymer affect etch rate would be very helpful in designing high etch rate products [1,2] . There are a few empirical mathematical models in the literature that predict the relationship between intrinsic make up of a polymer and its etch rate.…”

Section: Introductionmentioning

confidence: 99%

The effects of etch chemistry on the etch rates of ArF BARC products

et al. 2006

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As the feature sizes of integrated circuits shrink, highly anisotropic etching process (i.e., ion-assisted plasma etch, or reactive ion etch (RIE)), becomes even more essential for successful pattern transfer in the fabrication of semiconductor devices. The stringent 193 nm lithography process necessitates the use of bottom anti-reflective coating (BARC) for controlling reflections and improving swing ratios. Prior to RIE of a patterned wafer, the BARC layer must first be opened to allow pattern transfer from the resist mask to the underlying films. As we enter the era of sub-90nm imaging, minimum loss of the photoresist during the BARC open step is becoming more critical, since the demand for higher optical resolution dictates the use of ever thinner resist films. This in turn requires higher etch rate of BARC materials.In this paper we report on the impact of etching gas chemistries on the etch rates of BARC materials. The correlation between the etch chemistry and BARC products will be discussed. Reactive ion etch rates for blanket BARC coatings and BARCs under resist patterns were measured. Etch rates of BARC products of various material compositions were measured with a typical ArF resist as reference. It is well known that the chemical composition and structure of organic materials essentially determine the etch rates under certain etch process conditions. The correlations between etch rates and BARC polymer chemistry are reported. Etch chemistries, (i.e. the chemical interaction of plasma reactive ions with BARC materials), may also have profound effects on etch rates. Here we report on results obtained using four etching gas chemistries to study how oxygen contents, polymerizing gases, and inert gas effect the etch rates of different ArF BARC products.

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Section: Introductionmentioning

confidence: 99%