Donald J. Perettie

Benzocyclobutene as a planarization resin for flat panel displays

Benzocyclobutene (BCB) is being developed to planarize both substrate glass, color filters and active devices for flat panel displays. In addition, the material is being evaluated as the alignment layer and acceptable pre-tilt angles are reported. The results of the current study have shown the BCB to exhibit superior planarization to polyimide with efficiencies 90. As an example, a typical P-V (peak-valley) of a color filter is reduced from about 1.4 (mu) initially to about 1200 angstroms with the application of 1.2 (mu) of BCB. In addition to efficiently smoothing the color filters, the BCB can also be employed to planarize the substrate glass, while acting as a Na+ barrier. For this particular example, the BCB coated glass is subjected to ITO deposition and the resultant film still exhibits excellent optical clarity with transmissions of approximately 92 respectively before and after ITO. The glass substrate is also efficiently planarized to the point that the directionality of the float direction becomes ambiguous.

An anomalous emission from Ru(bpy)32+ adsorbed onto porous Vycor glass

Abstract Tris(2,2′-bipyridine)ruthenium(II), Ru(bpy) 3 2+ , cation exchanges onto porous Vycor glass without a chase in its absorption or resonance Raman spectra. When excited with an intense 355 nm laser pulse, the adsorbed complex undergoes biphotonic excitation followed by emission with a maximum at 510 nm and a shoulder at 610 nm. The 510 nm emission decays via a fast non-exponential process whereas that at 610 nm is exponential with a lifetime similar to that in aqueous solution.

A high-performance, flexible substrate for thin-film media

Abstract Advances in magnetic recording tape and flexible disk systems are limited to a large extent by the properties of the substrate, particularly for the case of evaporated or sputtered thin-film media. In this paper we report on the magnetic properties of thin-film media deposited onto a new high-performance polymeric film with improved tensile strength, which can withstand temperatures as high as 600°C without any adverse effects. Good magnetic properties were obtained by oblique incidence evaporation of cobalt films onto the heated substrates.

Flexible storage medium for write-once optical tape

A write-once data storage media has been developed which is suitable for optical tape applications. The media is manufactured using a continuous film process to deposit a ternary alloy of tin, bismuth, and copper. This laser sensitive layer is sputter deposited onto commercial plastic web as a single-layer thin film. A second layer is sequentially deposited on top of the alloy to enhance the media performance and act as an abrasion resistant hard overcoat. The media was observed to have laser write sensitivities of less than 2.0 njoules/bit, carrier-to-noise levels of greater than 50 dBs, modulation depths of approximately 100%, read-margins of greater than 35, uniform grain sizes of less than 200 angstroms, and a media lifetime that exceeds 10 years. Prototype tape media was produced for use in the CREO drive system. The active and overcoat materials are first sputter deposited onto three mil PET film in a single pass through the vacuum coating system, and then converted down into multiple reels of 35 mm X 880 m tape. One mil PET film was also coated in this manner and then slit and packaged into 3480 tape cartridges.

Laser Initiated Free-Radical Reactions

We present the experimental results of three laser initiated free-radical reactions. As one might expect, each reaction exhibits a wavelength dependence, but the mechanisms for each are not intuitively obvious. In all three examples, photochemical induction followed by thermal propagation results in higher conversions with fewer by-products when compared to strictly thermal synthetic routes.

Perfluorocyclobutane containing aromatic ether polymers as an electronic-grade resin for flat panel displays

Perfluorocyclobutane aromatic ether polymer (PFCB) is being researched as a planarization resin for color filters and active devices for flat panel displays. In addition, the material is being evaluated as the alignment layer as well as the color filter binder and the results will be reported here in. The results of the current study have shown PFCB to exhibit superior planarization to polyimide with efficiencies <90%. As an example, a typical 1.5 micrometers P-V (Peak-Valley) of a color filter can be reduced to about 120 nm with the application of about 5 micrometers of PFCB. In addition to efficiently smoothing color filter type patterns, the PFCB is being explored as a binder resin for the dye or pigment.

Photoinitiated Catalysis by Transition Metal Carbonyls

Photocatalysis by metal carbonyl compounds has generated increased interest in view of the reaction systems which can be studied.1 In the present work which is being pursued in our laboratory, catalysis by metal carbonyls is being studied based on photo-generation of thermal catalysts. Some of the systems under investigation are shown below.

Benzocyclobutene as planarization resin for charge-coupled devices

for use in multi-chip modules and interlayer dielectric applications.New versions of the material are being developed as both overcoatand planarization materials for use in active and passive componentsof flat panel displays and charge coupled devices. Specifically, BCBhas shown excellent results for color filter elements as either anovercoat or undercoat material.BCB is unique among electronic materials in that it polymerizes by acycloaddition reaction, which is being non-condensation in nature,allows films to be formed without entrapment of any volatiles. Thestructure of BCB and general polymerization sequence is shownbelow in Figure 1.

Perfluorocyclobutane containing aromatic ether polymers as planarization materials for alternative magnetic media substrates

Perfluorocyclobutane aromatic ether polymers (PFCB) are being researched as planarization materials for alternative magnetic media substrates allowing smoother surfaces for lower head flying recording. The results of current work reported herein have shown that PFCB can be used to affect surfaces on canasite with RA’s less than 2 nm. In addition, magnetic media can be produced of a quality comparative to that obtained on standard NiP‐coated Al as well as that produced on regular canasite with equivalent coercivities at about 1500–1600 Oe and squarenesses of 0.8 or better. In addition to the above magnetic properties the recording performance was excellent with signal‐to‐noise ratios of planarized media 3.5 dB higher than that on regular canasite.

Laser Initiated Free Radical Chemistry

The topic which will be covered in the series will be that of the use of lasers in free radical processes. The object of our work is to either develop novel processes based on laser initiated free-radical reactions or optimize the present reactions. Many industrial chemicals are currently produced via organic photochemistry including commodity chemicals such as caprolactam and methyl-chloroform. There also have been recent reports1 of a potential photochemical pathway for the production of vinylchloride which is another large volume material.