Abstract
β-NaYF4:Yb3+(25%),Ho3+(1%) microprisms with different grain sizes were synthesized by a hydrothermal method. The structure, composition and upconversion emission properties of the products were characterized by scanning electron microscopy, x-ray diffractometer, inductively coupled plasma atomic emission spectrometry and spectrophotometer. It is found that with the decrease of NaF/NH4HF2 ratios in solution, the lengths of the β-NaYF4:Yb3+(25%),Ho3+(1%) microprisms increase from ~5 to ~15μm. The enhancements in the UC emissions with the increase of grain sizes resulted from the raise of the Yb3+ concentrations in crystals. Applying these materials at the back of a-Si single junction and a-Si/a-Si tandem solar cells, currents of 2.34 and 1.02μA are obtained under 60mW (80mW/cm2) 980nm laser excitation, respectively.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: 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.
