Y2O3:Eu3+, Tb3+ spherical particles based anti-reflection and wavelength conversion bifunctional films: Synthesis and application to solar cells

摘要

In this study, Eu~(3+) and Tb~(3+) co-doped spherical Y203 particles were prepared via the simple, cost-effective urea homogeneous precipitation method without additives. Then, the chosen particles were added in the SiO_2 sols to get anti-reflection and wavelength conversion bifunctional films. And this bifunctional films can effectively improve the photoelectric conversion efficiency by reducing the sunlight loss and modifying the solar spectrum at the same time. Careful investigations were carried out to find the optimum preparation conditions and proper morphology. SEM photos showed that the particle sizes reduced as metal ion/urea ratio decrease. Additionally, the extracted particles turned from sphere to lamellar type when the deionized water,which was used as solvent, reduced to a certain extent. The mechanisms of the morphology formation and diversification were proposed as well. The florescent spectra indicated that the two kinds of samples shared similar florescent properties. The materials can convert a wide waveband in the UV region to visible photons from 450nm to 640nm, which just matched with high spectral response waveband of amorphous silicon solar cells, especially. And the spherical samples showed better luminous performance than the ones with lamellar morphology. In addition, the optical transmittance spectra indicated that the films adding spherial particles had better anti-reflective performances, and the best adding amount was 0.08g. Finally, the films were applied to solar cells, the photoelectric conversion efficiency enhancement can reach 10.3%.