Fundamental study on PZT thin film capacitor(I)

PZT박막 Capacitor에 관한 기초연구(I)

  • Published : 1993.02.01

Abstract

Abstract The PZT thin film was deposited by usin. RF magnetron sputtering with PZT(52/48) target. The formation of perovskite structure PZT thin film started at 55$0^{\circ}C$ on Si substrate. The AES results showed an oxide layer formed at the between Si and PZT film during the annealing. And, Ti$O_2$ layer appeared at the between TiN and PZT film for the annealing. But, the perovskite phase PZT film was formed after the annealing on the Si$O_2$/Si substarte. The ratio in PZT film was constant across the asdeposited PZT film, but, Pb have diffused into the Si substrate and Si have out-diffused into PZT layer during the post annealing at 75$0^{\circ}C$. The dielectric constants of PZT film indicated about 1300( thickness: 1500$\AA$, at 10KHz) but, the cracks were appeared to surface for annealing.

RF magnetrom sputtering으로 52/48 PZT target을 사용하여 PZT thin film을 증착시킨후, furnace annealing을 실시하여 Si 기판에서는 55$0^{\circ}C$에서부터 안정상인 peroskite구조가 형성되었다. Si기판위에서는 후속열처리시 계면에 상당한 산화막층이 형성되었으며 TiN 기판위에서는 후속열처리시 TiN층은 사라지고 Ti$O_2$층이 형성되었다. Si$O_2$기판에서는 후속열처리후에도 안정한 PZT film을 형성시킬 수 있었다. As-depo.시에는 PZT film의 조성비가 균일하게 유지되었으나 75$0^{\circ}C$후속열 처리시에는 상당량의 Pb가 Si기판으로 diffusion하였으며 Si도 out-diffusion하였다. 전기적 특성은 10KHz에서 C-V를 측정결과 약 1300정도의유전상수 값이 나왔으나 후속열처리시 표면에 crack이 발생하였다.

Keywords

References

  1. Proceedings of the International Electron Device Meeting M.Koyanagi;H.Sumami;N.Hashimoto;M.Ahikawa
  2. IEEE Transcation on Electron Devices v.ED-31 no.6 H.Sunami;T.Kure;N.Hashimoto;K.Itoh;T.Toyabe;S.Asai
  3. Proc. IEEE Int. Symp. Application of Ferroelectrics A.Mansingh;K.Sreenivas;T.Rao
  4. Proc. IEEE Int. Solid-State Circuits Conf. R.Womack;D.Toisch
  5. Proc. of the IEEE v.77 no.3 ALF.TASCH,Jr.
  6. MaL. Res. Soc. Symp. Proc. v.200 Chik. Kwok;Seshu B. Desu;Lee Kamnerdiner
  7. J. Vac. Sci. Technol. A v.9 no.3 Gene H. Heartling
  8. J. Appl. Phys. v.49 no.8 Akira Okada
  9. MRS Sym. Proc. v.200 R.A.Roy;K.F.ETZOLD
  10. Proc. of the 6th IEEE Int. Sym. of Application of Ferroelectrics M.Sayer
  11. VLSI Technology(2nd Version) Sze
  12. Handbook of Sputter Deposition Technol. Kiyotaka Wasa;Shigeru Hayakawa