High Chloride Doping Levels Stabilize the Perovskite Phase of Cesium Lead Iodide

Abstract

Synthesis and purification of CsPbX3 nanocrystals: The synthesis followed the procedure of Protesescu et al. 1 with only slight modifications. 0.204 g of Cs2CO3 (Aldrich, 99.9%), 10 mL 1-octadecene (ODE, Sigma-Aldrich, 90%) and 0.63 mL of Oleic acid (OA, Sigma-Aldrich, 90%) were charged in a 3-neck flask and degassed at 120 °C for 1 h. The mixture temperature was raised to 150 °C under a N2 atmosphere and held there until the formation of Cs-oleate was observed by the complete dissolution of the solid. The solution temperature was maintained at 100 °C to avoid any precipitation. To synthesize the nanocrystals, 0.75 mmol of PbX2 (PbI2: 0.346 g, Strem Chemicals, 99.999%; PbCl2: 0.209 g, Aldrich, 99.999%), along with 20 ml of ODE, were combined in a 3-neck flask and degassed for 1 h at 120 °C. 4 mL of dried OA and 4 mL of dried Oleylamine (OLA, Aldrich, 70%) were injected at 120 °C under N2. For the PbCl2, 4 mL of tri-n-octylphosphine (TOP, Strem, 97%) was also added. Once PbX2 dissolved completely the mixture temperature was increased to 165 °C and 1.6 mL of Cs-oleate solution was injected rapidly. After a short wait (10 s), the synthesis product was quenched by an ice-water bath. After the synthesis, the reaction mixture was treated with an anti-solvent to flocculate the nanocrystals,

Sequential deposition method fabricating carbonbased fully-inorganic perovskite solar cells

“…S3, the light absorption peaks of these films are shorter thañ 375 nm. Combining the previous reports [21,22,25] and the fact that no PbBr 2 residual could be found in D-10 films, we hypothesize the reaction route according to the equation: CsBr+2PbBr 2 →CsPb 2 Br 5 . Then, CsPb 2 Br 5 continues to react with CsBr in methonal according to the equation: CsPb 2 Br 5 +CsBr→2CsPbBr 3 .…”

Polymer-Enhanced Stability of Inorganic Perovskite Nanocrystals and Their Application in Color Conversion LEDs

“…In thin films recent studies show that doping CsPbI 3 with chloride ions improves the stability of the optically active perovskite crystal phase. 39 So far, solution based doping of iodide containing NCs has proven evasive but future advances in this direction may help to amend the instability of the red component. During irradiation the emission of the green filter increased as the red component decreased, indicating a substantial re-absorption of the emitted green light by the red component that may be solved by advanced filter design.…”

A Facile Low Temperature Fabrication of High Performance CsPbI2Br All‐Inorganic Perovskite Solar Cells

“…[5][6][7][8] With the progress of these organic-inorganic hybrid perovskite, all-inorganic halide perovskite has demonstrated to be another promising novel alternative candidate for various optoelectronic applications. [9][10][11][12][13][14][15] These allinorganic lead halide perovskites of CsPbX 3 (X ¼ I, Br, Cl) have advantage of higher thermal stability over the well-studied organic-inorganic hybrid lead halide perovskites, such as MAPbX 3 (X ¼ I, Br, Cl). [16][17][18] The excellent thermal stability of all-inorganic lead halide perovskites can be ascribed to the absence of volatile organic component and the higher formation energy.…”