Green upconversion improvement of TiO2 codoped Er3+-Yb3+ nanoparticles based thin film by adding ALD-Al2O3 for silicon solar cell applications
Résumé
This paper investigates the upconversion luminescence modification of codoped nanoparticles with lanthanides ions based thin films through adding a coating. First, these nanoparticles based thin films composed of Er 3+-Yb 3+ co-doped anatase-TiO 2 are prepared using spin coating technique supported by a design of experiment (DOE) approach with the Hadamard matrix of order 4 to improve the deposition conditions. For the coating step, different thicknesses of Al 2 O 3 layer are realised by thermal atomic layer deposition (T-ALD) onto the surface of Er 3+-Yb 3+ co-doped anatase-TiO 2 nanoparticles based thin films. The results show that the ALD-Al 2 O 3 coating can benefit the luminescence properties of the upconversion nanoparticles based thin films. Thin ALD-Al 2 O 3 (10 nm) coated stack exhibits similar upconversion luminescence as the uncoated nanoparticles based film but insures also their stability. Meanwhile, for 100 nm ALD-Al 2 O 3 coating, enhancement of the upconversion green emission by 98 % at the expense of the red emission compared to uncoated sample is observed. This results are promising to be applied in photovoltaics field.
Domaines
MatériauxOrigine | Fichiers produits par l'(les) auteur(s) |
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