Skip to main content Accessibility help

Reactive-Ion-Etching of 100nm Linewidth Tungsten Features Using SF6:H2 and a Cr-Liftoff Mask

  • Loretita M. Shirey (a1), Kelly W. Foster (a2), William Chu (a1), John Kosakowski (a3), Kee Woo Rhee (a3), Charles Eddy (a4), Doewon Park (a1), I. Peter Isaacson (a1), Daniel Mccarthy (a1), Christie R. K. Marrian (a1), Martin C. Peckerar (a5) and Elizabeth A. Dobisz (a5)...


Reactive ion etching of features down to 100 nm in linewidth in tungsten has been studied using an SF6 based chemistry. The studies were carried out in a PlasmaTherm 500 etcher operated at low pressure (2 mTorr) and power (100 mWatts/cm2). Key processing parameters have been identified to achieve the resolution and aspect ratio required for high contrast x-ray masks. The critical parameters include sample temperature, gas dilution and end point detection. However, even with all of these parameters optimized, additional sidewall passivation is required to obtain the necessary 6.5:1 aspect ratio. A novel method of achieving such passivation based on an intermittent etching process is described.



Hide All
1. Ku, Y.C., Ng, L.-P., Carpenter, R., Lu, K., Smith, H.I., Haas, L.E. and Plotnik, I., J. Vac. Sci. Technol. B, 9(6), 3297 (1991).
2. Rhee, K.W., Ting, A.C., Shirey, L.M., Foster, K.W., Andrews, J.M., Peckerar, M.C. and Ku, Y.C., J. Vac Sci. Technol. B, 9(6), 3292 (1991).
3. Peters, L., Semiconductor International, May, 66 (1992).
4. Chu, W., Foster, K.W., Shirey, L.M., Rhee, K.W., Kosakowski, J., Isaacson, P., McCarthy, D., Eddy, C.R. Jr., Dobisz, E.A., Marrian, C.R.K. and Peckerar, M.C., (submitted to Appl. Phys. Lett.)
5. Jurgensen, C.W., Kola, R.R., Novembre, A.E., Tai, W.W., Frackoviak, J., Trimble, L.E. and Celler, G.K., J. Vac. Sci. Technol. B, 9(6), 3280 (1991).


Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed