Antireflective downconversion ZnO:Er3+,Yb3+ thin film for Si solar cell applications

摘要

Hexagonal wurtzite phased ZnO: Er3+/Yb3+ thin films with various Yb concentrations were deposited on Si(111) substrate by Aerosol Assisted Chemical Vapor Deposition process. Post-annealed films at 1000 degrees C in air atmosphere showed a crystallinity enhancement. Yb3+ (F-4(7/2) > F-4(5/2)) 1000 nm emission increased with the increase of Yb3+ concentration emanating from an Er-Yb energy transfer. The reflectance percentage of 12 was achieved in the 250-1000 nm range, and the refractive index of 1.97 was obtained for 632 nm wavelength. These results suggest that the (3 mol. Er, 9 mol. Yb) codoped film is a highly efficient antireflective downconversion layer for enhancing Si solar cell efficiency. (C) 2015 AIP Publishing LLC.