Synergistic Effects of Multifunctional Lanthanides Doped CsPbBrCl₂ Quantum Dots for Efficient and Stable MAPbI₃ Perovskite Solar Cells

Abstract

The passivation effect of inorganic perovskite quantum dots (PQDs) is a promising method to attain outstanding performance in perovskite solar cells (PSCs), which has ignited widespread interest recently. Lanthanides (Ln) doped PQDs demonstrate unique properties, but nevertheless, are not explored in PSCs. In this work, four kinds of Ln3+ doped CsPbBrCl2 PQDs (Ln3+ = Yb3+, Ce3+, Eu3+, Sm3+) are firstly introduced into PSCs, which displays the synergistic effect of composition engineering and defect engineering. The results indicate that the introduction of CsPbBrCl2: Ln3+ can not only improve the crystallinity and passivate the intrinsic and surface defects of the MAPbI3 layer through ion and ligand passivation, but also form a stronger LnI bond than PbI, adjust work function (WF), and optimize band alignments. CsPbBrCl2:Sm3+ PQDs possess the best performance and exhibit remarkable promotions of open‐circuit voltage (Voc) from 1.13 to 1.20 V and power conversion efficiency from 18.54% to 22.52%. The humid‐resist, thermal‐resist abilities, and the long‐term stability of PSCs are energetically improved due to enhanced structure stability by Sm3+ doping and the hydrophobic characteristic. The strategy of Ln3+ doped PQDs applied to PSCs provide an approach to achieve high‐performance PSCs.

Simultaneous enhancement of near infrared luminescence and stability of Cs2AgInCl6:Cr3+ double perovskite single crystals enabled by a Yb3+ dopant

“…S7, † exhibited a blue-shift for CAIC:Cr 3+ ,Yb 3+ DPSCs compared with the CAIC:Cr 3+ DPSCs, which is attributed to the passivation of shallow trap states in CAIC:Cr 3+ ,Yb 3+ DPSCs as discussed in more detail later. 35,36 The PL spectra with different excitation wavelengths shown in Fig. S8 † vary in intensity but maintain the same shape with the excitation wavelength changing from 320 to 600 nm, indicating that the NIR emission originates from the same transition.…”

“…44 Ln 3+ doping has been suggested to passivate anion defects due to strong Ln-X bonding that reduces the formation of defects and increases the exciton lifetime of perovskites. 36,45 The PL spectra and TRPL profiles of CAIC:Cr 3+ ,Er 3+ and CAIC: Cr 3+ ,Ho 3+ DPSCs were measured and are shown in Fig. S10 and S11.…”

Configuration of Methylammonium Lead Iodide Perovskite Solar Cell and its Effect on the Device's Performance: A Review

“…The modification improves the crystallinity and passivates the intrinsic and surface defects of the MAPbI 3 layer through ion and ligand passivation. [294] Doping the SnO 2 layer effectively increases the performance of MAPbI 3 PSCs by enhancing the conductivity and reducing the recombination. The most used dopants are Li, Mg, Y, Sb, www.advmatinterfaces.de Nb, Al, Mo, and La.…”

“…The highest recorded conversion efficiency of MAPbI 3 PSCs is 22.54%. [ 294 ] However, more research on MAPbI 3 based PSCs is still necessary to achieve higher efficiency and excellent stability which are important for future applications. Therefore, here we focus our review on the most widely studied perovskite – MAPbI 3 .…”

“…The modification improves the crystallinity and passivates the intrinsic and surface defects of the MAPbI 3 layer through ion and ligand passivation. [ 294 ]…”