scholarly journals Synthesis and optical properties of lead-free cesium germanium halide perovskite quantum rods

RSC Advances ◽  
2018 ◽  
Vol 8 (33) ◽  
pp. 18396-18399 ◽  
Author(s):  
Lin-Jer Chen
Keyword(s):  
Optical Properties ◽  
Lead Free ◽  
Solvothermal Process ◽  
Quantum Rods ◽  
Halide Perovskite ◽  
First Time

Herein, the fabrication of a lead-free cesium germanium halide perovskite produced via a simple solvothermal process is reported for the first time.

scholarly journals Correction: Synthesis and optical properties of lead-free cesium germanium halide perovskite quantum rods

RSC Advances ◽  
2019 ◽  
Vol 9 (58) ◽  
pp. 33847-33847 ◽  
Author(s):  
Lin-Jer Chen
Keyword(s):  
Optical Properties ◽  
Lead Free ◽  
Quantum Rods ◽  
Halide Perovskite

Correction for ‘Synthesis and optical properties of lead-free cesium germanium halide perovskite quantum rods’ by Lin-Jer Chen, RSC Adv., 2018, 8, 18396–18399.

scholarly journals Seed Mediated Synthesis of Colloidal Halide Perovskite Nanoplatelets

2021 ◽  
Author(s):  
C. Meric Guvenc ◽  
sinan balci
Keyword(s):  
Optical Properties ◽  
Halide Salt ◽  
Seed Solution ◽  
Synthesis Route ◽  
Line Widths ◽  
Halide Perovskite ◽  
Seed Mediated ◽  
A Site ◽  
First Time ◽  
Lead Halide

<p><b>Two-dimensional lead halide perovskite nanoplatelets (2D LHP NPLs) have been emerging as one of the most promising semiconductor nanomaterials due to their narrow absorption and emission line widths, tunable bandgaps, high exciton binding energies, high defect tolerance as well as highly localized energy states. Colloidal synthesis of 2D LHP NPLs is generally performed using hot-injection or ligand assisted precipitation techniques (LARP). In the LARP method, perovskites are synthesized in polar solvents, which decrease the stability of the 2D LHP NPLs due to their weakly bonded nature. In fact, the presence of residual polar solvent in the LHP NPL colloid can cause deterioration of thickness uniformity, degradation of NPLs to parent precursors, and undesired phase transformations. Herein, for the first time, we report facile seed-mediated synthesis route of monolayer, 2-monolayers, and thicker lead halide perovskite nanoplatelets without using A site cation halide salt (AX</b><b>;</b><b> A = Cesium, methylammonium, formamidinium and, X = Cl, Br, I) and long chain alkylammonium halide salts (LX; L = oleylammonium, octylammonium, butylammonium and, X = Cl, Br, I). The seed solution has been synthesized by reacting lead (II) halide salt and coordinating ligands (oleylamine or octylamine and oleic acid) in nonpolar high boiling solvent (1-octadecene). The seed mediated synthesis has been carried out in hexane by reacting seed solution with A-site cation precursors (Cs-oleate, FA-oleate, or diluted MA solution in hexane) under ambient conditions. More importantly, the seed mediated growth of NPLs has been tracked for the first time by performing in-situ optical measurements. Furthermore, the optical properties and morphologies of the seeds have been extensively studied. We find that our facile synthesis route provides highly stable, monodisperse NPLs with narrow absorption, and photoluminescence line widths (68-201 meV), and high PLQY (37.6-1.66% for 2ML NPLs). Furthermore, anion exchange reactions have been performed by mixing pre-synthesized LHP NPLs with counter halide seeds. The optical properties of NPLs have been affectively tuned by postsynthetic chemical reactions without changing the thickness of the NPLs. We anticipate that our new synthetic route provides further understanding of growth dynamics of LHP NPLs.</b></p>

scholarly journals Seed Mediated Synthesis of Colloidal Halide Perovskite Nanoplatelets

2021 ◽  
Author(s):  
C. Meric Guvenc ◽  
sinan balci
Keyword(s):  
Optical Properties ◽  
Halide Salt ◽  
Seed Solution ◽  
Synthesis Route ◽  
Line Widths ◽  
Halide Perovskite ◽  
Seed Mediated ◽  
A Site ◽  
First Time ◽  
Lead Halide

<p><b>Two-dimensional lead halide perovskite nanoplatelets (2D LHP NPLs) have been emerging as one of the most promising semiconductor nanomaterials due to their narrow absorption and emission line widths, tunable bandgaps, high exciton binding energies, high defect tolerance as well as highly localized energy states. Colloidal synthesis of 2D LHP NPLs is generally performed using hot-injection or ligand assisted precipitation techniques (LARP). In the LARP method, perovskites are synthesized in polar solvents, which decrease the stability of the 2D LHP NPLs due to their weakly bonded nature. In fact, the presence of residual polar solvent in the LHP NPL colloid can cause deterioration of thickness uniformity, degradation of NPLs to parent precursors, and undesired phase transformations. Herein, for the first time, we report facile seed-mediated synthesis route of monolayer, 2-monolayers, and thicker lead halide perovskite nanoplatelets without using A site cation halide salt (AX</b><b>;</b><b> A = Cesium, methylammonium, formamidinium and, X = Cl, Br, I) and long chain alkylammonium halide salts (LX; L = oleylammonium, octylammonium, butylammonium and, X = Cl, Br, I). The seed solution has been synthesized by reacting lead (II) halide salt and coordinating ligands (oleylamine or octylamine and oleic acid) in nonpolar high boiling solvent (1-octadecene). The seed mediated synthesis has been carried out in hexane by reacting seed solution with A-site cation precursors (Cs-oleate, FA-oleate, or diluted MA solution in hexane) under ambient conditions. More importantly, the seed mediated growth of NPLs has been tracked for the first time by performing in-situ optical measurements. Furthermore, the optical properties and morphologies of the seeds have been extensively studied. We find that our facile synthesis route provides highly stable, monodisperse NPLs with narrow absorption, and photoluminescence line widths (68-201 meV), and high PLQY (37.6-1.66% for 2ML NPLs). Furthermore, anion exchange reactions have been performed by mixing pre-synthesized LHP NPLs with counter halide seeds. The optical properties of NPLs have been affectively tuned by postsynthetic chemical reactions without changing the thickness of the NPLs. We anticipate that our new synthetic route provides further understanding of growth dynamics of LHP NPLs.</b></p>

scholarly journals Synthesis and Optical Properties of Lead-Free Cesium Tin Halide Perovskite Nanocrystals

2016 ◽  
Vol 138 (9) ◽  
pp. 2941-2944 ◽  
Author(s):  
Tom C. Jellicoe ◽  
Johannes M. Richter ◽  
Hugh F. J. Glass ◽  
Maxim Tabachnyk ◽  
Ryan Brady ◽  
...  
Keyword(s):  
Optical Properties ◽  
Lead Free ◽  
Perovskite Nanocrystals ◽  
Halide Perovskite

scholarly journals Lead‐Free Halide Perovskite Nanocrystals: Crystal Structures, Synthesis, Stabilities, and Optical Properties

2019 ◽  
Vol 59 (3) ◽  
pp. 1030-1046 ◽  
Author(s):  
Qianqian Fan ◽  
Gill V. Biesold‐McGee ◽  
Jianzhong Ma ◽  
Qunna Xu ◽  
Shuang Pan ◽  
...  
Keyword(s):  
Optical Properties ◽  
Crystal Structures ◽  
Lead Free ◽  
Perovskite Nanocrystals ◽  
Halide Perovskite

The top-down synthesis of single-layered Cs4CuSb2Cl12 halide perovskite nanocrystals for photoelectrochemical application

Nanoscale ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 5180-5187 ◽  
Author(s):  
Xu-Dong Wang ◽  
Nai-Hua Miao ◽  
Jin-Feng Liao ◽  
Wen-Qian Li ◽  
Yao Xie ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Lead Free ◽  
Top Down ◽  
Perovskite Nanocrystals ◽  
Halide Perovskite ◽  
First Time

Herein, lead-free single-layered Cs4CuSb2Cl12 and Cs3M2X9 (X = Cl, Br, I; M = Sb, Bi) perovskite NCs have been prepared for the first time via a top-down liquid-phase ultrasonic exfoliation technique.

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