Green upconversion improvement of TiO2 codoped Er3+-Yb3+ nanoparticles based thin film by adding ALD-Al2O3 for silicon solar cell applications

• DOI: 10.1016/j.jlumin.2022.119282
• Publication Date: 2022-09-07T06:32:43Z
• Authors: Fatma Trabelsi; Frédéric Mercier; Elisabeth Blanquet; Alexandre Crisci; Raphael Boichot; Danying Chen; Rached Salhi
• Keywords: [CHIM.MATE]Chemical Sciences/Material chemistry; 01 natural sciences; 620; 543; 0104 chemical sciences

International audience ; 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.