Tailoring multifunctional anions to inhibit methanol absorption on a CsPbBr₃ quantum dot surface for highly efficient semi-transparent photovoltaics

Abstract

Methyl acetate (MeOAc) is the most used antisolvent in the preparation of perovskite quantum dot (QD) films. However, the hydrolysis of MeOAc results in acetic acid and methanol (MeOH), and...

Surface engineering in CsPbX3 quantum dots: from materials to solar cells

“…Therefore, proton and solvent polarity should be minimized during the ligand exchange process. 106,[131][132][133][134][135] Kim et al 136 replaced the Pb-based ionic salts with NaOAc to generate OAc À directly (Fig. 13d), avoiding the formation of surface trap states and achieving a J SC value of 15.21 mA cm À2 in CsPbI 3 QD solar cells.…”

“…BA post-treatment was demonstrated to effectively exchange the long-chain ligands and improve the carrier transport of CsPbBr 3 QDs, leading to a champion PCE of 5.46% and an improved J SC of 4.84 mA cm −2 . Recently, an anion modification strategy was developed to inhibit methanol (MeOH) adsorption on the surface of CsPbBr 3 QDs, 135 which was implemented through incorporating a series of guanidinium salts containing different anions (GuaBr, GuaSCN, GuaAc) into each layer of CsPbBr 3 QD films. All anions play a positive role in inhibiting the adsorption of MeOH on the QD surface, facilitating charge transfer between perovskite QDs and passivating the defects (Fig.…”

Fabrication of water-resistant fluorescent ink using the near-unity photoluminescence quantum yield of CsPbBr3 doped with NiBr2

“…All-inorganic lead halide perovskites (LHPs) CsPbX 3 (X = Br, Cl, I) have attracted enormous research interest recently owing to their excellent physical and optoelectronic properties originating from their direct optical band gap, 1 large optical absorption coefficient, 2,3 long-range diffusion length, 4 high charge carrier mobility, 5 high photoluminescence quantum yield (PLQY), 6 narrow photoluminescence (PL) linewidth, 7 and wide colour gamut. 1–5 These interesting properties bring great potentiality 8–11 towards various optoelectronic applications like photovoltaics, 12,13 light-emitting diodes, 14–16 single-photon sources, 17–19 X-ray scintillators, 20 and lasers. 21 However, the sensitivity of LHPs to oxygen and moisture is an obstacle for realistic applications.…”