Journal
VACUUM
Volume 156, Issue -, Pages 212-218Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.vacuum.2018.07.023
Keywords
CIGS solar cell; Non-vacuum process; Stainless steel substrate; Selenization
Funding
- Advanced Research Center of Green Materials Science and Technology
- Ministry of Education [107L9006]
- Ministry of Science and Technology of the Republic of China, Taiwan [MOST 107-3017-F-002-001]
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Cu(In,Ga)Se-2 (CIGS) thin films were prepared on molybdenum-coated flexible stainless steel substrates through a non-vacuumspin-coating process followed by selenization at temperatures ranging from 450 degrees C to 575 degrees C. The effects of selenization temperatures and concentration of iron ions on the photoelectric properties of the CIGS solar cells was thoroughly investigated. All X-ray diffraction (XRD) patterns appropriately matched with those of CIGS phase. The diffraction peak intensities of undoped CIGS films were increased with an increase in selenization temperatures. However, XRD peak intensities of iron-ion doped CIGS films were decreased with the elevation of selenization temperatures owing to the degradation of thermal stability of CIGS films after iron-ion doping. As the selenization temperatures increased, the grain sizes of particles in CIGS films increased, and the films became densified with flat surfaces. The values of V-oc, J(sc) and fill factor for CIGS solar cells prepared at 450 degrees C were 0.401 V, 21.84 mA/cm(2), and 41.12%, respectively. These parameters were enhanced with increasing selenization temperatures due to improved crystallinity of CIGS and densified microstructures. However, iron-ion doping deteriorated the photoelectric properties because iron ions diffused into the absorption layers at high temperatures. The present study indicates that iron-ion doping adversely affected the photoelectric performance and microstructures of CIGS solar cells.
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