Effect of electrolyte composition on Cu thin film by electroplating

전해액 조성이 전기도금으로 제작된 구리박막의 특성에 미치는 영향

  • Song, Yoo-Jin (Department of Information Communication Engineering, Hanbat National University) ;
  • Seo, Jung-Hye (Department of Information Communication Engineering, Hanbat National University) ;
  • Lee, Youn-Seoung (Department of Information Communication Engineering, Hanbat National University) ;
  • Yeom, Kee-Soo (Department of Information Communication Engineering, Hanbat National University) ;
  • Ryu, Young-Ho (Department of Physics, Chungnam National University) ;
  • Hong, Ki-Min (Department of Physics, Chungnam National University)
  • 송유진 (한밭대학교 정보통신공학과) ;
  • 서정혜 (한밭대학교 정보통신공학과) ;
  • 이연승 (한밭대학교 정보통신공학과) ;
  • 염기수 (한밭대학교 정보통신공학과) ;
  • 류영호 (충남대학교 물리학과) ;
  • 홍기민 (충남대학교 물리학과)
  • Published : 2008.10.31

Abstract

Cu has been used for metallic interconnects in ULSI applications because of its lower resistivity according to the scaling down of semiconductor devices. The resistivity of Cu lines will affect the RC delay and will limit signal propagation in integrated circuits. We investigated the electrolyte effects of the electroplating solution in the resistivity value of Cu films grown by electroplating deposition (EPD). The resistivity was measured with a four-point probe and the material properties were investigated with XRD (X-ray Diffraction), AFM (Atomic Force Microscope), FE-SEM (Field Emission Scanning Electron Microscope) and XPS (X-ray Photoelectron Spectroscopy). From these experimental results, we found that the electrolyte condition plays an Important role in formation of Cu film with lower resistivity by EPD.

반도체 소자의 소형화에 따라 낮은 비저항을 가진 구리가 ULSI의 금속배선으로 사용되고 있다. 구리선의 비저항은 RC delay와 집적회로의 신호전달에 영향을 미치게 된다. 본 논문에서는 전기도금 된 구리박막의 비저항에 대해 전해액이 미치는 영향을 조사하였다. 4탐침 표면저항측정기로 비저항을 평가하였고, XRD (X-ray Diffraction), AFM (Atomic Force Microscope), FE-SEM (Field Emission Scanning Electron Microscope), XPS (X-ray Photoelectron Spectroscopy)로 박막의 특성을 조사하였다. 실험한 결과, 전해액의 조건이 전기도금으로 증착된 낮은 비저항을 갖는 구리박막의 형성에 있어 중요한 역할을 하는 것을 확인하였다.

Keywords