Donor Centers Involved into the Quantum Cutting in Ytterbium-Doped Scheelite‐Like Crystals
Authors: Subbotin K.A., Titov A.I., Lis D.A., Sani E., Smirnov V.A., Alimov O.K., Zharikov E.V., Shcherbakov, I.A.
Autors Affiliation: Laser Materials and Technology Research Centre Prokhorov General Physics Institute of Russian Academy of Sciences
Vavilova str. 38, Moscow 119991, Russia; Department of Chemistry and Technology for Crystals Mendeleev University of Chemical Technology of Russia Miusskaya sq. 9, Moscow 125048, Russia; CNR-INO National Institute of Applied Optics
Largo E. Fermi 6, Firenze 50125, Italy
Abstract: Yb-doped Scheelite-like molybdate and tungstate single crystals are promising quantum-cutting materials. The cooperative downconversion from donor centers to Yb ions occurs in heavily Yb-doped crystals of this family. This phenomenon can substantially raise the efficiency of crystalline silicon photovoltaic cells. However, the nature of donor centers is still unknown. Herein, several versions of this nature are tested and discussed: Yb3þ ion (its high-energy charge transfer states); Yb2þ ion; self-trapped exciton at molybdate/tungstate complex; color centers based on oxygen vacancies; accidental impurities. To test these assumptions, a series of Scheelite-like molybdate and tungstate single crystals (CaMoO4, CaWO4, NaLa(MoO4)2, NaGd(MoO4)2, NaGd(WO4)2, and NaY1xGdx(WO4)2) are grown, both undoped and doped with different Ybconcentrations. The complex spectroscopic investigations of these crystals are performed. As a result of the studies, three versions, self-trapped excitons at [MoO4]/[WO4] complexes, color centers at oxygen vacancies, and accidental impurities, coming into the crystals with MoO3, are rejected. The applicability ofthe other versions should be refined.
Journal/Review: PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
Volume: 2019 Pages from: 1900659-1 to: 1900659-8
KeyWords: quantum cutting, Scheelites, ytterbiumDOI: 10.1002/pssa.201900659Citations: 1data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2020-06-28References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here