Synthesis of PbS-CH 3 NH 3 PbI 3 core-shell nanoparticles with enhanced photoelectric properties

Colloidal quantum dots and metal halide perovskite hybridization for solar cell stability and performance enhancement

“…85 Similar effect in the grain size by QD addition has also been observed in other works. 86,[91][92][93] The main mechanism in the ligand exchange from organic QD capping to halide or perovskite shell is based on the binding of iodine anions to lead atoms on the QD surface. 94 The sturdy and inert shell insulate the QDs from oxygen or water molecules and protect them from photocorrosion.…”

“…Discrete nanoparticles each composed of QDs and hetero nanoparticle is combined by chemical bonding or physical contact. 35,47,92,102,103 The nano-heterojunction structure may incorporate new functions beyond those of each independent component. Yang et al devised a strategy based on n-and p-type ligands that judiciously shifted the QD band alignment.…”

Recent Developments of Solar Cells from PbS Colloidal Quantum Dots

“…Comparing these core-shell nanoparticles with the original PbS nanoparticles capped with oleic acid/oleylamine, as prepared before the ligand exchange (Figure 4), showed clearly improved electric properties of the corresponding Schottky type solar cell with an approximately five-times higher efficiency than without a ligand exchange. The increased open current voltage was explained by the larger barrier height of the core-shell nanoparticles, in addition to trap state passivation in the quantum dot surface by the MAPI shell, while the improved fill factor and photocurrent were attributed to an enhanced charge transport, based on the lower distance between neighboring quantum dots after the ligand exchange [62].…”

“…Another way was suggested by Li et al [62], who used the inorganic-organic hybrid material CH 3 NH 3 PbI 3 (MAPI) for PbS nanoparticle passivation and investigated the resulting electrical properties of Schottky type solar cells built with these core-shell nanoparticles. It should be mentioned that passivation, in general, is a technology step which reduces surface-related effects and emphasizes the intrinsic bulk-electronic properties.…”

Controlled growth of uniform and dense perovskite layers on SnO2 via interface passivation by PbS quantum dots

“…Lead sulfide (PbS) QDs have been reported to induce the nucleation process of PVK when embedded at the bottom or in the PVK layer. 17 Furthermore, Choy et al have proved there is a strong interaction between the halide anions and PbS QDs. This ion-QD interaction can inhibit the mobilization of iodide ions, increase the crystalline quality of PVK films, and improve the stability of the final PSC devices.…”