Atomistic Origin of Lattice Softness and Its Impact on Structural and Carrier Dynamics in Three Dimensional Perovskites

2022 ◽  
Author(s):  
Zhendong Guo ◽  
Jing Wang ◽  
Wanjian Yin
Keyword(s):  
Material Properties ◽  
Three Dimensional ◽  
Carrier Dynamics ◽  
Defect Tolerance ◽  
Anharmonic Vibration ◽  
Unique Material ◽  
Halide Perovskites ◽  
Polaron Formation ◽  
Lead Halide

The soft lattices of lead-halide perovskites (LHPs) are responsible for their unique material properties, including polaron formation, defect tolerance, anharmonic vibration, and large electrostrictive response, which result in exotic carrier...

Enhancing Defect Tolerance with Ligands at the Surface of Lead Halide Perovskites

2021 ◽  
pp. 6299-6304
Author(s):  
Tyler J. Smart ◽  
Hiroyuki Takenaka ◽  
Tuan Anh Pham ◽  
Liang Z. Tan ◽  
Jin Z. Zhang ◽  
...  
Keyword(s):  
Defect Tolerance ◽  
Halide Perovskites ◽  
Lead Halide

Iodine chemistry determines the defect tolerance of lead-halide perovskites

2018 ◽  
Vol 11 (3) ◽  
pp. 702-713 ◽  
Author(s):  
Daniele Meggiolaro ◽  
Silvia G. Motti ◽  
Edoardo Mosconi ◽  
Alex J. Barker ◽  
James Ball ◽  
...  
Keyword(s):  
Defect Tolerance ◽  
Electron Hole ◽  
Halide Perovskites ◽  
Iodine Chemistry ◽  
Lead Halide

Electron/hole traps related to interstitial iodine defects show the typical features of iodine photo-electrochemistry, inducing MAPbI3 defect tolerance.

scholarly journals Lead halide perovskites: Crystal-liquid duality, phonon glass electron crystals, and large polaron formation

2017 ◽  
Vol 3 (10) ◽  
pp. e1701469 ◽  
Author(s):  
Kiyoshi Miyata ◽  
Timothy L. Atallah ◽  
X.-Y. Zhu
Keyword(s):  
Large Polaron ◽  
Halide Perovskites ◽  
Polaron Formation ◽  
Lead Halide

scholarly journals Defect tolerant device geometries for lead-halide perovskites

2021 ◽  
Author(s):  
Basita Das ◽  
Zhifa Liu ◽  
Irene Aguilera ◽  
Uwe Rau ◽  
Thomas Kirchartz
Keyword(s):  
Thin Films ◽  
Defect Tolerance ◽  
Solution Processed ◽  
Radiative Lifetimes ◽  
Polycrystalline Thin Films ◽  
Halide Perovskites ◽  
Lead Halide

The term defect tolerance is widely used in literature to describe materials such as lead-halides perovskites, where solution-processed polycrystalline thin films exhibit long non-radiative lifetimes of microseconds or longer. Studies...

scholarly journals Morphological and Optical Tuning of Lead-Free Cs2SnX6 (X = I, Br) Perovskite Nanocrystals by Ligand Engineering

2021 ◽  
Vol 2 ◽  
Author(s):  
Alessandro Veronese ◽  
Carlo Ciarrocchi ◽  
Marcello Marelli ◽  
Paolo Quadrelli ◽  
Maddalena Patrini ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Blue Shift ◽  
Carbon Chain ◽  
Lead Free ◽  
Future Research ◽  
Promising Alternative ◽  
Perovskite Nanocrystals ◽  
Halide Perovskites ◽  
Capping Ligands ◽  
Lead Halide

In order to overcome the toxicity of lead halide perovskites, in recent years the research has focused on replacing lead with more environmentally friendly metals like tin, germanium, bismuth or antimony. However, lead-free perovskites still present instability issues and low performances that do not make them competitive when compared to their lead-based counterparts. Here we report the synthesis of lead-free Cs2SnX6 (X = Br, I) nanostructures of different shapes by using various surface ligands. These compounds are a promising alternative to lead halide perovskites in which the replacement of divalent lead (Pb(II)) with tetravalent tin (Sn(IV)) causes a modification of the standard perovskite structure. We investigate the effects of different amines on the morphology and size of Cs2SnX6 (X = Br, I) nanocrystals, presenting a facile hot-infection method to directly synthesize three-dimensional (3D) nanoparticles as well as two-dimensional (2D) nanoplatelets. The amines not only modify the shape of the crystals, but also affect their optical properties: increasing the length of the amine carbon chain we observe a widening in the bandgap of the compounds and a blue-shift of their emission peak. Alongside the tuning of the chemical composition and the reduction of the crystal size, our study offers a new insight in controlling the physical properties of perovskite nanocrystals by means of the capping ligands, paving the way for future research on lead-free materials.

Hot Carrier Dynamics in Lead Halide Perovskites: Mobility and Carrier-Phonon Coupling

2019 ◽  
Author(s):  
Andrés Burgos-Caminal ◽  
Aurélien Willauer ◽  
Ahmad Ajdar Zadeh ◽  
Jacques-E. Moser
Keyword(s):  
Carrier Dynamics ◽  
Phonon Coupling ◽  
Hot Carrier ◽  
Halide Perovskites ◽  
Lead Halide

Ultrafast THz Fingerprints of Large Polaron formation in Lead-Halide Perovskites

2018 ◽  
Author(s):  
E. Cinquanta ◽  
D. Meggiolaro ◽  
M. Gandini ◽  
E. Mosconi ◽  
S. G. Motti ◽  
...  
Keyword(s):  
Large Polaron ◽  
Halide Perovskites ◽  
Polaron Formation ◽  
Lead Halide

scholarly journals Charge‐Carrier Dynamics, Mobilities, and Diffusion Lengths of 2D–3D Hybrid Butylammonium–Cesium–Formamidinium Lead Halide Perovskites

2019 ◽  
Vol 29 (35) ◽  
pp. 1902656 ◽  
Author(s):  
Leonardo R. V. Buizza ◽  
Timothy W. Crothers ◽  
Zhiping Wang ◽  
Jay B. Patel ◽  
Rebecca L. Milot ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Carrier Dynamics ◽  
Charge Carrier Dynamics ◽  
Halide Perovskites ◽  
And Diffusion ◽  
Lead Halide

scholarly journals Efficient sky-blue perovskite light-emitting diodes via photoluminescence enhancement

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Qi Wang ◽  
Xiaoming Wang ◽  
Zhi Yang ◽  
Ninghao Zhou ◽  
Yehao Deng ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
Light Emitting Diodes ◽  
Three Dimensional ◽  
Wide Bandgap ◽  
Charge Carriers ◽  
Light Emitting ◽  
Upper Limit ◽  
Halide Perovskites ◽  
Grain Surface ◽  
Lead Halide

AbstractThe efficiencies of green and red perovskite light-emitting diodes (PeLEDs) have been increased close to their theoretical upper limit, while the efficiency of blue PeLEDs is lagging far behind. Here we report enhancing the efficiency of sky-blue PeLEDs by overcoming a major hurdle of low photoluminescence quantum efficiency in wide-bandgap perovskites. Blending phenylethylammonium chloride into cesium lead halide perovskites yields a mixture of two-dimensional and three-dimensional perovskites, which enhances photoluminescence quantum efficiency from 1.1% to 19.8%. Adding yttrium (III) chloride into the mixture further enhances photoluminescence quantum efficiency to 49.7%. Yttrium is found to incorporate into the three-dimensional perovskite grain, while it is still rich at grain boundaries and surfaces. The yttrium on grain surface increases the bandgap of grain shell, which confines the charge carriers inside grains for efficient radiative recombination. Record efficiencies of 11.0% and 4.8% were obtained in sky-blue and blue PeLEDs, respectively.

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