Title :
Sputtered CuInSe2 polycrystalline and epitaxial films and devices
Author :
Yang, L. Chung ; Berry, G. ; Chou, L.J. ; Kenshole, G. ; Rockett, A. ; Mullan, C.A. ; Kiely, C.J.
Author_Institution :
Dept. of Mater. Sci. & Eng., Illinois Univ., Urbana, IL, USA
Abstract :
Recent solar cell fabrication results based on a scalable hybrid sputtering and evaporation deposition process are described. A method for controlling adhesion problems, which are a major cause of poor device performance is presented based on a two-phase back contact substrate metallization; and results of transmission electron microscopy analyses of epitaxial CuInSe2 are described. Polycrystalline CuInSe2 was deposited on Mo or Cu-Mo coated glass. Single crystal CuInSe2 was grown on GaAs substrates. The use of Cu-Mo two phase back contacts significantly improved adhesion of our CuInSe2 films to the substrates. The best heterojunction solar cell produced to date on Cu-Mo has an efficiency of 10.0%. Cell performance uniformity was also improved relative to results on pure Mo. Single crystal CuInSe2 grown on GaAs (111)A substrates showed very rough surface morphologies. Films on GaAs (111)B were smooth with occasional triangular pyramidal islands. The most stable faces of CuInSe 2 are concluded to be the Se-terminated (112) planes
Keywords :
copper compounds; crystal morphology; epitaxial growth; indium compounds; metallisation; p-n heterojunctions; semiconductor epitaxial layers; solar cells; sputter deposition; sputtered coatings; substrates; ternary semiconductors; transmission electron microscope examination of materials; Cu-Mo coated glass; CuInSe2; CuInSe2 epitaxial films; GaAs substrates; Mo coated glass; adhesion problems control; cell performance uniformity; evaporation deposition; heterojunction solar cell; rough surface morphologies; sputtered CuInSe2 polycrystalline devices; transmission electron microscopy; triangular pyramidal islands; two-phase back contact substrate metallization; Adhesives; Fabrication; Gallium arsenide; Glass; Metallization; Performance analysis; Photovoltaic cells; Sputtering; Substrates; Transmission electron microscopy;
Conference_Titel :
Photovoltaic Specialists Conference, 1993., Conference Record of the Twenty Third IEEE
Conference_Location :
Louisville, KY
Print_ISBN :
0-7803-1220-1
DOI :
10.1109/PVSC.1993.347129
