Sulfurization of Cu―In electrodeposited precursors for CuInS2-based solar cells

• Published in: Solar energy materials and solar cells Vol. 95; pp. S13 - S17
• Main Authors: BROUSSILLOU, C, ANDRIEUX, M, HERBST-GHYSEL, M, JEANDIN, M, JAIME-FERRER, J. S, BODNAR, S, MORIN, E
• Format: Conference Proceeding Journal Article
• Language: English
• Published: Amsterdam Elsevier 01.05.2011
• Subjects: Applied sciences; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Energy; Engineering Sciences; Exact sciences and technology; Materials; Natural energy; Photoelectric conversion; Photovoltaic conversion; Solar cells. Photoelectrochemical cells; Solar energy; Ternary compound; Performance evaluation; Annealing; Forming; Sulfurization; X ray diffraction; Solar cell; Rapid thermal processing; Chalcopyrite; Heating; Spinels; Copper sulfide; Physical vapor deposition; Electrodeposition; CuInS; Copper; Sulfur; Indium sulfide; Formation mechanism; Cost lowering; CuInS2
• ISSN: 0927-0248; 1879-3398
• DOI: 10.1016/j.solmat.2011.01.037

Cu-In electrodeposited layers were annealed using rapid thermal processing (RTP) in a reactive atmosphere containing sulfur vapors. The CuInS2 formation mechanism during sulfurization of electrodeposited precursors proceeds mainly through direct sulfurization of the metallic Cu-In alloy, forming spinel CuIn5S8 and chalcopyrite CuInS2 ternary phases. During the heating step, the Cu-In metallic alloy gets richer in copper as the temperature increases and transforms from CuIn2 to Cu11In9, then Cu16In9 and finally to Cu7In3. The use of rapidly cooled samples stopped after different durations of the process along with ex-situ XRD analysis enabled us to differentiate the Cu16In9 and Cu7In3 phases. Finally, the efficiency of the solar cells made with the two-step electrodeposition and RTP low-cost process reaches 11% (active area 0.421 cm2), which is close to the results obtained for cells made with PVD precursors.