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A novel production process for 10 μm microvias
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
2017 (English)Conference paper, Published paper (Refereed)
Abstract [en]

This work investigates the capability of drilling and metallization of microvias of diameter less than 10 µm with aspect ratios of 1-10, using a fully additive process.

The microvia has been produced using a sequential build up layer of urethane through which the via has been produced. The urethane layer is applied using spin-coating. Current process setting produces a 15 µm layer thickness. For thicker urethane, multiple layers are applied. Drilling of the via-hole through is made using 266 nm UV laser.

The metallisation of the via-hole was made using a process called Covalent Bonded Metallisation (CBM).

This process modifies the urethane surface by a grafting process where polymers are covalently bonded to the

surface where metallisation is desired. A roughly 5 µm thin film of the used grafting solution is applied to the substrate surface. The grafting process is initiated by laser which draws the patterns where copper is desired.

After laser drawing, the substrate is cleaned with deionized water. Next, the substrate is through a commercial

chemical-copper process which builds copper only at the laser initiated patterns. Copper thicknesses of 1 µm is easily achievable. To increase the copper thickness, the substrate may be run into thick building chemical-copper process to achieve thicknesses up to 8 µm.

Place, publisher, year, edition, pages
USA: International Microelectronics and Packaging Society (IMAPS), 2017. , 5 p.
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Industrial Electronics
Identifiers
URN: urn:nbn:se:ltu:diva-65779OAI: oai:DiVA.org:ltu-65779DiVA: diva2:1143912
Conference
IMAPS 2017 - Raleigh IMAPS 50th Anniversary Symposium, October 9th to 12th, Raleigh, NC
Available from: 2017-09-23 Created: 2017-09-23 Last updated: 2017-11-24

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Citation style
  • apa
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