A Facile Methodology for Engineering the Morphology of CsPbX3 Perovskite Nanocrystals under Ambient Condition

Abstract

A facile and highly reproducible room temperature, open atmosphere synthesis of cesium lead halide perovskite nanocrystals of six different morphologies is reported just by varying the solvent, ligand and reaction time. Sequential evolution of the quantum dots, nanoplates and nanobars in one medium and nanocubes, nanorods and nanowires in another medium is demonstrated. These perovskite nanoparticles are shown to be of excellent crystalline quality with high fluorescence quantum yield. A mechanism of the formation of nanoparticles of different shapes and sizes is proposed. Considering the key role of morphology in nanotechnology, this simple method of fabrication of a wide range of high quality nanocrystals of different shapes and sizes of all-inorganic lead halide perovskites, whose potential is already demonstrated in light emitting and photovoltaic applications, is likely to help widening the scope and utility of these materials in optoelectronic devices.

Reversible Ultra‐Slow Crystal Growth of Mixed Lead Bismuth Perovskite Nanocrystals: The Presence of Dynamic Capping

“…[11] Therefore, it is ap rimary concernt os earch for as ystem with high quantum yield withoutc ompromising stability. [15] Thus, capping is one of the most efficient ways to enhance thes tability of perovskite NCs in the solution [16][17][18] Oleic acid (OA) and oleylamine( OAm) are popular capping agentsr eported in the literature for the synthesis of such perovskite NCs. Properties of Bi-doped Pb halide NCs have been explored recently by somer esearch groups.…”

“…Keepingt his in mind,w eh ave synthesized organic-inorganic hybrid iodide perovskite NCsw ith an appropriate ratio of Pb 2 + and Bi 3 + in order to maintain the formalc harge balancet hat is, (+ 2) in the B-site of these perovskites. [15,16,18,19] OA has less capping ability than OAm, buta ny of these two alone cannotp rovide as ufficient stabilityt oP bp erovskite NCs because of their poor binding with Pb 2 + . [12,13] In our previous study,w eh ave also reported the potentialo ft hese charge-balanced hybrid Pb-Bi perovskite thin films forsolar cell applications.…”

“…[12,13] In our previous study,w eh ave also reported the potentialo ft hese charge-balanced hybrid Pb-Bi perovskite thin films forsolar cell applications. [15,19] For size and shape tunable synthesis of perovskite NCs, the proportiona nd the amount of OA and OAm play ac rucial role. [15] Thus, capping is one of the most efficient ways to enhance thes tability of perovskite NCs in the solution [16][17][18] Oleic acid (OA) and oleylamine( OAm) are popular capping agentsr eported in the literature for the synthesis of such perovskite NCs.…”

“…[15] Thus, capping is one of the most efficient ways to enhance thes tability of perovskite NCs in the solution [16][17][18] Oleic acid (OA) and oleylamine( OAm) are popular capping agentsr eported in the literature for the synthesis of such perovskite NCs. [5,6,15,16] Interestingly in one report, Seth et al have demonstrated the time-dependent shift of the emission maxima for CsPbBr 3 and CsPbBr 2 Ip erovskite NC suspensions under continuous light irradiation. [19] However,w hen these two ligandsa re used together,t hey form the oleate anion and olylammonium cation,w hich are better cappinga gentsd ue to the strong interaction with Pb 2 + and X À ,r espectively.…”

Therapie bei Pleuramesotheliom wird immer besser

“…"Man kann das Emphysem jetzt auch endoskopisch sehen, aber es bleibt die Frage, welchen Zusatznutzen diese Technik liefert", so Herth. Auch bei der Beurteilung der Dignität von Rundherden konnte damit bisher kein Vorteil gegenüber dem bisherigen Standard belegt werden [6].…”