• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2007.11a
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• pp.166-168
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• 2007

스퍼터링법으로 제작된 FCCL은 PI필름(Poly-imide film)과 Cu layer사이에 Tie-coating layer로 Ni-Cr을 많이 사용한다. 하지만 완성된 FCCL에서 페터닝을 실시할 때 Cr성분이 소멸되지 않고 잔존하는 현상으로 누설전류가 발생 한다. 또한 Cr으로 인해 Eatching액의 오염으로 재사용의 어려움도 발생된다. 이러한 원인들은 제품의 특성들을 저하 시키므로 이를 개선할 필요가 있다. 따라서 본 연구에서는 기존의 Tie-coating layer를 대체할 물질로 Acrylic acid를 이용하여 FCCL을 제작하여 표면특성 평가를 위해 Contact angle측정과 부착력을 위한 Peel test측정과 조직분석 및 성분분석을 위해 SEM-EDS를 측정을 통하여 Polymerization을 이용한 Ti-coating layer 개발의 가능성을 확인하였다.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2005.11a
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• pp.152-152
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• 2005

• Journal of the Korean institute of surface engineering
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• v.38 no.2
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• pp.49-54
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• 2005

Flexible copper clad laminates (FCCL) fabricated by sputtering has advantages in fine pitch etching and dimensional accuracy than previous casting or laminating type FCCL, But its lower adhesion is inevitable technical challenge to solve for commercializing it. Chromium (Cr) which strongly reacts with O moiety was used as tie-coating layer in order to improve low adhesion between copper (Cu) and polyimide (PI). Sputtering raw polyimide (SRPI) and casting raw polyimide (CRPI) were used as substrates at this research. PI was pretreated by plasma before sputtering, and each sample was varied with RF power and Cr thickness on sputtering. Peel strength of the FCCL on SRPI was higher than that on CRPI. Adhesion had maximum value when 10 nm of Cr was deposited on SRPI by RF power of 50 W. It seems to be by the formation of Cu-Cr-O solid solution at the metal-PI interface.

• Korean Journal of Materials Research
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• v.17 no.10
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• pp.509-515
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• 2007

In order to fabricate adhesiveless 2-layer flexible copper clad laminate (FCCL) used for COF (chip on film) with high peel strength, polyimide (PI; Kapton-EN, $38\;{\mu}m$) surface was modified by reactive $O_2^+$ and $N_2O^+$ ion beam irradiation. 300 mm-long linear electron-Hall drift ion source was used for ion irradiation with ion current density (J) higher than $0.5\;mA/cm^2$ and energy lower than 200 eV. By vacuum web coating process, PI surface was modified by linear ion source and then 10-20 nm thick Ni-Cr and 200 nm thick Cu film were in-situ sputtered as a tie layer and seed layer, respectively. Above this sputtered layer, another $8-9{\mu}m$ thick Cu layer was grown by electroplating and subsequently acid and base resistance and thermal stability were tested for examining the change of peel strength. Peel strength for the FCCLs treated by both $O_2^+$ and $N_2O^+$ ion irradiation showed similar magnitudes and increased as the thickness of tie layer increased. FCCL with Cu (200 nm)/Ni-Cr (20 nm)/PI structure irradiated with $N_2O^+$ at $1{\times}10^{16}/cm^2$ ion fluence was proved to have a strong peel strength of 0.73 kgf/cm for as-received and 0.34 kgf/cm after thermal test.