Abstract
The controllability of the three-stage-growth process of Cu(In,Ga)Se 2 films was investigated, implementing two different substrate temperature monitoring channels simultaneously: (a) a thermocouple at the rear side of the substrate, and (b) a pyrometer, measuring the emission of heat radiation from the front surface of the growing film. By this setup not only the film composition, i.e. the relative incorporation rate of Cu and group III elements, but as well the absolute growth rate can be monitored on-line during growth. The heat radiation intensity during the first growth stage (deposition of (In,Ga) 2Se 3 precursor films) exhibits characteristic oscillations. The oscillation period is inversely proportional to the growth rate. The oscillations are caused by thickness interference effects of black body radiation within the growing film. By a simulation of the infrared emissivity, the refractive index n igs=2.9 and absorption coefficient k igs=0.2 of the growing film could be extracted. Employing our process, Mo/CIGS/CdS/ZnO/Al solar cells with an efficiency up to 16.4% could be realized.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.