Broadband Solar Spectral Conversion in Near-Infrared Quantum Cutting $\hbox{Ce}^{3+}\hbox{-Tb}^{3+}/\hbox{Yb}^{3+}$ System for Improving Si Solar-Cell Performance

In this paper, a framework for investigating and optimizing Ce³⁺ -Tb³⁺/Yb³⁺ tripled-doped solar spectral downconverting layer is provided. We investigate broadband solar spectral downconversion in near-infrared (NIR) quantum cutting system of Ce³⁺-Tb³⁺/Yb³⁺ triple-doped YBO₃ employed by modeling and solving rate and power propagation equations of Ce³⁺-Tb³⁺/Yb³⁺ . For the optimized Ce³⁺, Tb³⁺, and Yb³⁺ concentrations and the thickness of doping layer, total power conversion efficiency of 176% and quantum conversion efficiency of 187% have been theoretically obtained. The total amount of NIR photon output may be increased to meet the purpose of potentially enabling a Si solar cell with a performance improvement. The paper will be also helpful to further investigate and design much more efficient rare-earth-multidoped system of broadband solar spectral conversion for further improving performances of Si solar cells.