Resist Wiki: Photoresists – Negative

Coloured negative photoresists

Allresist now also offers colored negative resists with the designation SX AR-N 8500. The difference to FUJIFILM resists is that only dyes and no pigments are dissolved in the resists. This allows to achieve a high resolution and high edge sharpness.
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CAR 44 on copper

If negative photoresist CAR 44 (AR-N 4400) is directly used on copper or copper-containing substrates, the following points must be observed.
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Fabrication of vertical flanks with CAR 44

AR-N 4400-50 was investigated at the TU Braunschweig with particular regard to the fabrication of well-defined resist architectures with vertical flanks.
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Patterning of poly(phthalaldehydes) with photolithography

PPA layers are light-sensitive and can thus also be patterned directly with photolithography. Irradiation with light at a wavelength of < 300 nm (Hg-vapour lamp) results in the cleavage of polymer chains and the formation of volatile components that partly begin to evaporate already at room temperature.
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Dose-dependent structure size with negative resists

The desired structure size also largely depends on the exposure dose used. In the case of overexposure, structures begin to widen which is particularly pronounced during laser exposure.
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Generation of undercut structures with negative resists

With laser direct exposure, a slight undercut of the structures can be generated: The upper part of the layer is more strongly irradiated due to the absorption of the resist and consequently more intensely crosslinked.
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Sensitive negative resist for 405 nm laser direct exposure

Negative resist AR-N 4400-10 can be structured with laser direct exposure at an exposure wavelength of 405 nm. Different arrays are shown in the figure.
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Water-based resists

Layers are after exposure treated with H2O2 and developed with water. Allresist has developed similar negative resists within the framework of a research project.
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NIR-laser structurable photoresists

By adding suitable dyes to negative-working CAR resists, even a patterning beyond the usual wavelength range is possible if pulsed lasers with sufficiently high intensity are used for exposure.
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Development of thick negative resist layer

If the negative resist AR-N 4400-50 is utilised, resist layers of >200 µ m can be built up in repeated coating steps (see product information of CAR 44). Decisive for the quality of the layers to be obtained is the bake procedure.
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