Hydrazine-based deposition route for device-quality CIGS films

• Published in: Thin solid films Vol. 517; no. 7; pp. 2158 - 2162
• Main Authors: Mitzi, David B., Yuan, Min, Liu, Wei, Kellock, Andrew J., Chey, S. Jay, Gignac, Lynne, Schrott, Alex G.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 02-02-2009
• Subjects: CIGS; Non-vacuum; Photovoltaics; Solar cells; Spin coating; Thin-film; Solar cells; Non-vacuum; Thin-film; CIGS; Spin coating; Photovoltaics
• ISSN: 0040-6090; 1879-2731
• DOI: 10.1016/j.tsf.2008.10.079

A simple solution-based approach for depositing CIGS (Cu–In–Ga–Se/S) absorber layers is discussed, with an emphasis on film characterization, interfacial properties and integration into photovoltaic devices. The process involves incorporating all metal and chalcogenide components into a single hydrazine-based solution, spin coating a precursor film, and heat treating in an inert atmosphere, to form the desired CIGS film with up to micron-scaled film thickness and grain size. PV devices (glass/Mo/CIGS/CdS/i-ZnO/ITO) employing the spin-coated CIGS and using processing temperatures below 500 °C have yielded power conversion efficiencies of up to 10% (AM 1.5 illumination), without the need for a post-CIGS-deposition treatment in a gaseous Se source or a cyanide-based bath etch. Short-duration low-temperature (
T
<
200 °C) oxygen treatment of completed devices is shown to have a positive impact on the performance of initially underperforming cells, thereby enabling better performance in devices prepared at temperatures below 500 °C.