MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS VOLUME 164 Materials Issues In Microcrystalline Semiconductors Symposium held November 29-December 1, 1989, Boston, Massachusetts, U.S.A. EDITORS: Philippe M. Fauchet Princeton University, Princeton, New Jersey, U.S.A. Kazunobu Tanaka Electrotechnical Laboratory, Ibaraki, Japan Chuang Chuang Tsai Xerox Palo Alto Research Center, Palo Alto, California, U.S.A. MIRISI MATERIALS RESEARCH SOCIETY Pittsburgh, Pennsylvania