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Nanocomposite SAC Solders for Improving Reliability of Soldering Technology
Young Kyu Hong(홍영규),Sri Harini Rajendran(라젠드란 스리 하리니),Hye Jun Kang(강혜준),Jae Pil Jung(정재필) 대한용접·접합학회 2021 대한용접학회 특별강연 및 학술발표대회 개요집 Vol.2021 No.5
Nanocomposite Sn-Ag-Cu solders are the potential candidates in the advanced integrated circuit packaging such as flip-chip, and ball grid arrays. Sn-Ag-Cu solders are eco-friendly with desirable thermal and mechanical characteristics. In recent nanotechnology era, addition of nanoparticles in the solder matrix is explored widely as the nanoparticles to have a positive contribution in the Ag3Sn refinement, interfacial Cu6Sn5 suppression and the reliability of the solder joints. However, the contribution of nanoparticles in aging characteristics is still under investigation. In the present work, the shear strength and aging characteristics of Sn-3.0Ag-0.5Cu (SAC 305)/Cu joints by the addition of ZrO2 nanoparticles are investigated. Nanocomposite pastes are fabricated by mechanically mixing ZrO2 and the solder paste. Addition of ZrO2 nanoparticles decreased theβ-Sn grain size and Ag3Sn intermetallic compound (IMC) in the matrix and reduced the Cu6Sn5 IMC thickness at the interface of lap shear SAC 305/Cu joints. The solder joints were isothermally aged at 175˚C for 24, 48, 144 and 256 hours. ZrO2 addition decreased the diffusion coefficient from 1.74 x 10 -16 m/s to 3.83 x 10 -17 m/s, thereby reducing the growth of Cu-Sn IMC at the interface. The shear strength of the solder joints decreased with the aging time due to an increase in the thickness of interfacial IMC and coarsening of Ag3Sn in the solder. However, higher shear strength exhibited by SAC 305-ZrO2/Cu joints was attributed to the fine Ag3Sn IMC’s dispersed in the solder matrix.
레이저 어블레이션에 의해 증착된 비정질 다이아몬드 박막의 결합및 물리적 특성
박환태,홍영규,김재기,김진승,박찬,Park, Hwan-Tae,Hong, Young-Kyu,Kim, Jae-Ki,Kim, Jin-Seung,Park, Chan 한국진공학회 1996 Applied Science and Convergence Technology Vol.5 No.1
Noncrystalline films of diamond-like carbon (DLC) have been prepared by laser ablation technique at room temperature. A Q-switched Nd-YAG laser beam with wavelength of 1064 nm and pulse duration of 10 ns was focused onto a graphite target with power densities of about $10^9 W/\textrm{cm}^2$. The physical properties of the resulting films were analyzed with density, hardness, and resistivity measurements. The surface and bonding structure were investigated by atomic force microscopy (AFM), Raman spectroscopy, electron energy loss spectroscopy (EELS).
Controlled Growth of Multi-walled Carbon Nanotubes Using Arrays of Ni Nanoparticles
지승묵,이태진,방재호,홍영규,김한철,하동한,김창수,구자용,Ji, Seung-Muk,Lee, Tae-Jin,Bahng, Jae-Ho,Hong, Young-Kyu,Kim, Han-Chul,Ha, Dong-Han,Kim, Chang-Soo,Koo, Ja-Yong The Korean Vacuum Society 2008 Applied Science and Convergence Technology Vol.17 No.5
화학기상증착법과 Ni 나노입자 배열을 이용한 탄소나노튜브의 최적 성장 조건을 연구했다. Ni 입자의 크기를 변화시키는 방법으로 탄소나노튜브의 직경을 20 nm 이하까지 제어할 수 있었다. 개별 Ni 입자의 크기와 위치는 기존의 식각법 등을 이용하여 웨이퍼 수준의 대면적에서 연속적으로 제어가 가능하였다. 성장온도, 탄소원, 희석가스 등의 비율을 최적화 함으로써 $SiO_2/Si$ 웨이퍼의 넓은 면적에서 각 Ni 입자로부터 단 한 개씩의 탄소나노튜브가 100% 확률로 성장 가능하다는 것을 보였다. 탄소나노튜브의 위치, 직경, 벽두께 등의 특성들은 성장조건을 조정하여 제어가능하다는 것을 보였다. We have investigated the optimal growth conditions of carbon nanotubes (CNTs) using the chemical vapor deposition and the Ni nanoparticle arrays. The diameter of the CNT is shown to be controlled down to below 20 nm by changing the size of Ni particle. The position and size of Ni particles are controlled continuously by using wafer-scale compatible methods such as lithography, ion-milling, and chemical etching. Using optimal growth conditions of temperature, carbon feedstock, and carrier gases, we have demonstrated that an individual CNT can be grown from each Ni nanoparticle with almost 100% probability over wide area of $SiO_2/Si$ wafer. The position, diameter, and wall thickness of the CNT are shown to be controlled by adjusting the growth conditions.