Cerium and Ytterbium Codoped Halide Perovskite Quantum Dots: A Novel and Efficient Downconverter for Improving the Performance of Silicon Solar Cells

Abstract

Quantum cutting can realize the emission of multiple near-infrared photons for each ultraviolet/visible photon absorbed, and has potential to significantly improve the photoelectric conversion efficiency (PCE) of solar cells. However, due to the lack of an ideal downconversion material, it has merely served as a principle in the laboratory until now. Here, the fabrication of a novel type of quantum cutting material, CsPbCl Br :Yb , Ce nanocrystals is presented. Benefiting from the larger absorption cross-section, weaker electron-phonon coupling, and higher inner luminescent quantum yield (146%), the doped perovskite nanocrystals are successfully explored as a downconverter of commercial silicon solar cells (SSCs). Noticeably, the PCE of the SSCs is improved from 18.1% to 21.5%, with a relative enhancement of 18.8%. This work exhibits a cheap, convenient, and effective way to enhance the PCE of SSCs, which may be commercially popularized in the future.

Yb3+ and Yb3+/Er3+ doping for near-infrared emission and improved stability of CsPbCl3 nanocrystals

“…19 Due to the lattice contraction in the CsPbCl 3 :Yb 3+ NCs, the chemical bonding properties among the crystal structures should have obvious changes. 43 Fig. 2 g-i show that the binding energies of the Cs + , Pb 2+ and Cl - ions become higher.…”

Recent advances and prospects toward blue perovskite materials and light‐emitting diodes

“…Hence, the stability and PLQY are obviously enhanced by reducing the defect state density and passivating grain boundaries, leading to excellent optoelectronic properties for devices constructed by using the doped perovskites as active layers . Typically, various metal ions, including Bi 3+ , Ni 2+ , Mn 2+ , Cu 2+ , Zn 2+ , Cd 2+ and rare earth ions (eg, Ce 3+ , Er 3+ , Yb 3+ ), have been doped into halide perovskites. In the halide perovskite system, the similar bond energy between doped elements with X and Pb‐X is considered to be one of the key factors that favors impurity incorporation …”

Highly Efficient and Stable Inorganic Perovskite Quantum Dots by Embedding into a Polymer Matrix

“…The all‐inorganic perovskite quantum dots (QDs) of the formula CsPbX 3 (X=Cl, Br, I) have specifically attracted considerable attention due to their narrow emission line width, size‐dependent luminescence behavior, covering the visible to near infrared range (400–800 nm), as well as superior photoluminescence quantum yield (PL QY) . These advantages make them the ideal candidates for light‐emitting diode (LED), lasers, solar cells, and photodetector . In spite of the remarkable advantages of the perovskite QDs, there are still some drawbacks that hindering their practical applications .…”