Boosting the Photoluminescence of CsPbX₃ (X = Cl, Br, I) Perovskite Nanocrystals Covering a Wide Wavelength Range by Postsynthetic Treatment with Tetrafluoroborate Salts

Unveiling the Photo‐ and Thermal‐Stability of Cesium Lead Halide Perovskite Nanocrystals

“…CsPbX 3 nanocrystals have been incorporated into solar cells achieving a record 13.4 % power conversion efficiency (PCE). [15] Other syntheses have expanded this general idea by generating multiple nanocrystal morphologies through ligand mediation [21][22] and reaction tuning, [23] by using different surface ligands for improved quantum yields, [24][25] by increasing surface passivation/repair via salt solutions, [26][27][28][29] as well as by generating other cation/anion compositions through doping [17,[30][31][32][33][34][35] or post-synthetic ion exchange. [12,[19][20] Most reported syntheses of CsPbX 3 follow the work of Protesescu et al who demonstrated a simple, solution-based synthesis for nanocrystals with high luminescence.…”

“…[12,[19][20] Most reported syntheses of CsPbX 3 follow the work of Protesescu et al who demonstrated a simple, solution-based synthesis for nanocrystals with high luminescence. [15] Other syntheses have expanded this general idea by generating multiple nanocrystal morphologies through ligand mediation [21][22] and reaction tuning, [23] by using different surface ligands for improved quantum yields, [24][25] by increasing surface passivation/repair via salt solutions, [26][27][28][29] as well as by generating other cation/anion compositions through doping [17,[30][31][32][33][34][35] or post-synthetic ion exchange. [19,22,[36][37][38][39] In addition, triple-cation (Cs,formamidinium,methylammonium)PbX 3 materials have been developed with the goal of increasing stability while maintaining bright luminescence.…”

Role of Capped Oleyl Amine in the Moisture‐Induced Structural Transformation of CsPbBr3 Perovskite Nanocrystals

“…[1][2][3][4][5] The fascinating properties of lead halide perovskites such as broad absorption, narrow emission with near unity quantum yield, easier carrier extraction, and high photovoltaic efficiency proffered them as active materials for photovoltaic and light-emitting applications. [3,[6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] Till today, lead halide perovskite is one of the materials which has shown the highest efficiency for light-emitting diodes (LEDs) and photovoltaic applications. [1,6,[21][22][23][24][25][26] These interesting properties of perovskites are mainly due to their peculiar crystal structures.…”

Humidity‐Mediated Synthesis of Highly Luminescent and Stable CsPbX3 (X = Cl, Br, I) Nanocrystals

“…Previous studies have shown that the metallic lead present on www.advancedsciencenews.com www.entechnol.de the surface serves as trap states for charge carriers, provides a pathway for nonradiative recombination, and quenches the PL. [20,24,26,29,30,39,41] No noticeable improvement in PLQY was observed for CsPbCl 3 NCs. The PL decay profile of NCs is also improved significantly when treated with humidity.…”

“…Interestingly, it has been found that humidity favors the formation of monodisperse, neat, and crystalline NCs without any isolated impurities. [20,41] However, in the case of CsPbCl 3 , no obvious change in TEM images has been found with the variation of humidity conditions ( Figure S4, Supporting Information).…”