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Manipulation and Control of Nucleation and Growth Kinetics with Hydrogen Dilution in Hot-Wire CVD Growth of Poly-Si

  • Maribeth Swiatek (a1), Jason K. Holt (a1), David G. Goodwin (a1) and Harry A. Atwater (a1)

Abstract

We systematically explore the relationship between gas-phase kinetics and film microstructure in the hot-wire CVD technique using diluted silane (1% in He) and additional hydrogen. Using a wire temperature of 2000°C, films were grown on Si (100) at 300°C using 1 mTorr SiH4 and 99 mTorr He at hydrogen pressures from 0-100 mTorr. Transmission electron microscopy and atomic force microscopy measurements indicated that continuous microcrystalline films had a columnar grain structure and that grain size increased from 40 nm using SiH4/He to 85 nm using SiH4/He/H2 with 20:1 H2:SiH4 ratio due to the etching of silicon by hydrogen. Etching rate measurements using a quartz deposition monitor show that, under the current deposition conditions, a transition from net film growth (0.17 nm/s using only SiH4) to net etching occurs at a H2:SiH4 ration of 80:1. The effect of atomic H on the nucleation density during the initial stages of growth has also been investigated, revealing a sublinear dependence of nucleation density with time and a decrease in nucleation density with increasing H2 dilution. High deposition rate growth with no H2 dilution has been achieved on a low-density array of seed nuclei produced using high H2 dilution.

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[1] Matsumura, H., Jpn. J. Appl. Phys,.30, 1522 (1991).
[2] Wanka, H.N., Zedlitz, R., Heintze, M. and Schubert, M.B., Proc. 13th EC PVSEC, Nice 428, 1753 (1995).
[3] Cifre, J., Bertomeu, J., Puigdollers, J., Polo, M.C., Andreu, J., and Lloret, A., Appl. Phys. A, 59, 645 (1994).
[4] Wanka, H. N., Zedlitz, R., Heintze, M. and Schubert, M.B., Mat. Res. Soc. Symp. Proc., 420, 915 (1996).
[5] Thiesen, J., Iwaniczko, E., Jones, K.M., Mahan, A., and Crandall, R., Appl. Phys. Lett., 79, 992 (1999).
[6] Wanka, H.N. and Schubert, M.B., Mat. Res. Soc. Symp. Proc., 467, 921 (1997).

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