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SYMPOSIUM, SAN DIEGO, CA, USA, 24-26 APRIL 1989, pages 215 - 219 Pan H -C et al 'Nitrogen doping of ZnO prepared by organometallic chemical vapor deposition';  PATENT ABSTRACTS OF JAPAN vol. 15, no. 306 (C-856)6 August 1991 & JP-A-31 015 122 (LION CORP) 16 May 1991;  PATENT ABSTRACTS OF JAPAN vol. 15, no. 309 (P-1235)7 August 1991 & JP-A-31 008 173 (SEIKO EPSON CORP) 8 May 1991;  PATENT ABSTRACTS OF JAPAN vol. 4, no. 157 (E-32)4 November 1980 & JP-A-55 108 780 (SHARP CORP) 21 August 1980;  PATENT ABSTRACTS OF JAPAN vol. 5, no. 133 (E-71)25 August 1981 & JP-A-56 069 875 (FUJI ELECTRIC CO LTD) 11 June 1981;  SOLAR ENERGY MATERIALS. vol. 13 , 1986 , AMSTERDAM NL pages 75 - 84 QIU ET AL. 'TIN- AND INDIUM-DOPED ZINC OXIDE FILMS PREPARED BY RF MAGNETRON SPUTTERING'