DDAB-assisted synthesis of iodine-rich CsPbI₃ perovskite nanocrystals with improved stability in multiple environments

Abstract

Optimized method for synthesis of CsPbI3 NCs using dodecyldimethylammonium bromide as capping molecules can achieve enhanced stability.

Surface Passivation Strategies for Improving Photoluminescence and Stability of Cesium Lead Halide Perovskite Nanocrystals

“…The improved stability is ascribed to the binding of branched ligand DDAB over the surface of nanocrystal creating a halide‐rich environment. These NCs‐integrated LED device showed a maximum EQE of 1.25% with luminance of 468 cd/m 2 [92] . Introducing ammonium acetate can eliminate excess metal Pb 2+ cations and unsatisfied bonds, thus, boosting up the PLQY and stability making the NCs embeddable in LED device.…”

“…These NCs-integrated LED device showed a maximum EQE of 1.25% with luminance of 468 cd/m 2 . [92] Introducing ammonium acetate can eliminate excess metal Pb 2 + cations and unsatisfied bonds, thus, boosting up the PLQY and stability making the NCs embeddable in LED device. This red-emitting LED achieved EQE of 10.6% and luminance of 981 cd/m 2 which is 3 times that of un-passivated perovskite NCs.…”

Progress in halide-perovskite nanocrystals with near-unity photoluminescence quantum yield

“…Stronger ligand binding to the perovskite core One of the most recognized strategies to compensate for the loss of organic ligands from the shelf life of the CsPbBr 3 PNCs is through post-synthetic treatment with quaternary ammonium salts, namely didodecyldimethylammonium bromide (DDAB) [53,59,60]. Compared with the linked OLA that shows a high likelihood of desorption, DDA + cations produce stronger binding with the negatively charged surface sites of the perovskite [61,62]. This induces the formation of hydrophobic monolayers, increasing the long-term stability of the PNCs.…”

Core/Shell Metal Halide Perovskite Nanocrystals for Optoelectronic Applications

“…[15,16] Replacing MA or FA in the organic-inorganic halide perovskite NCs with Cs + was shown to produce all-inorganic perovskites with enhanced stability. [17][18][19] Moreover, various capping ligands, such as iminodibenzoic acid, trioctylphosphine oxide (TOPO), and didodecyldimethylammonium bromide (DDAB), were also explored in an attempt to improve perovskite NC stability. [6,[19][20][21] However, the soft ionic nature of all-inorganic halide perovskites also may result in the decomposition or degradation of such materials when exposing to polar solvents, light, heat, and oxygen, and can lead to phase transitions, hence posing substantial challenges for the practical applications of halide perovskite NCs.…”