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.

Can perovskite inspired bismuth halide nanocrystals outperform their lead counterparts?

2020 ◽  
Vol 8 (26) ◽  
pp. 12951-12963
Author(s):  
Sathy Harshavardhan Reddy ◽  
Ranadeep Raj Sumukam ◽  
Banavoth Murali
Keyword(s):  
Lead Free ◽  
Promising Alternative ◽  
Perovskite Nanocrystals ◽  
Halide Perovskites

In the quest for finding non-toxic and stable lead-free perovskite nanocrystals (NCs), bismuth halide perovskites (BHP) have emerged as a promising alternative. This perspective presents an overview, challenges, and future opportunities in BHP NCs.

Effect of Structure Change on Luminescent Properties of CsPbBr2I Perovskite Nanocrystals after Heat Treatment

2019 ◽  
Vol 72 (9) ◽  
pp. 663
Author(s):  
Ji Li ◽  
Li Wang ◽  
Xin Gao
Keyword(s):  
Quantum Confinement ◽  
Annealing Temperature ◽  
Luminescent Properties ◽  
Blue Shift ◽  
Exchange Reactions ◽  
Perovskite Nanocrystals ◽  
Average Grain Size ◽  
Halide Perovskites ◽  
Popular Subject ◽  
Lead Halide

Lead halide perovskite nanocrystals (NCs) are still a popular subject in the field of luminescence because of their high photoluminescence quantum yield (PLQY) and colour tenability through anion exchange reactions or quantum confinement. We investigated the structure and luminescence properties of the mixed halide perovskites CsPbBr2I NCs with annealing temperatures. The results showed that the average grain size of CsPbBr2I increased with increasing the temperature from 300 to 440K, and the morphology changed above 380K. The normalised PL spectra of CsPbBr2I NCs had an obvious blue-shift, and then displayed a slight red-shift with increasing annealing temperature. In addition, the PL intensities, peak energies, and bandwidths of the NC films as a function of temperature were discussed in detail.

Regulating the Phase Stability and Bandgap of Quasi-2D Dion–Jacobson Cubic CsSnI3 Perovskite via Intercalating Organic Cations

2022 ◽  
Author(s):  
Qian Sun ◽  
Zhi Fang ◽  
Yapeng Zheng ◽  
Zuobao Yang ◽  
Feng Hu ◽  
...  
Keyword(s):  
Phase Stability ◽  
Lead Free ◽  
Organic Cations ◽  
Promising Alternative ◽  
Halide Perovskites ◽  
Lead Halide

Currently, as a promising alternative of lead halide perovskites, the nontoxicity lead-free CsSnI3 perovskites have drawn increasing attention. However, the development of tin-based perovskites is still greatly hindered by their...

Highly Emissive Halide Perovskite Nanocrystals: From Lead to Lead-Free

CrystEngComm ◽  
2021 ◽  
Author(s):  
Chunlong Li ◽  
Jie Li ◽  
Zhengping Li ◽  
Huayong Zhang ◽  
Yangyang Dang ◽  
...  
Keyword(s):  
Charge Carriers ◽  
Lead Free ◽  
Quantum Yields ◽  
Local Management ◽  
Perovskite Nanocrystals ◽  
Halide Perovskites ◽  
Halide Perovskite

Nanostructured halide perovskites have highly yielded record LEDs due to their higher versatility in the local management of charge carriers, which has enabled photoluminescence quantum yields (PLQYs) close to 100%....

scholarly journals Colloidal Synthesis of Lead-free Cs2TiBr6-xIx Perovskite Nanocrystals

2021 ◽  
Author(s):  
Shanti Maria Liga ◽  
Gerasimos Konstantatos
Keyword(s):  
Solar Cells ◽  
Power Conversion ◽  
Lead Free ◽  
Colloidal Synthesis ◽  
Optoelectronic Materials ◽  
Perovskite Nanocrystals ◽  
Halide Perovskites ◽  
Conversion Efficiencies

Cesium titanium halide perovskites are novel lead-free optoelectronic materials that have attracted attention in the last two years for their application in solar cells with power conversion efficiencies reaching 3.3%....

scholarly journals Lead-Free Halide Double Perovskites: A Review of the Structural, Optical, and Stability Properties as Well as Their Viability to Replace Lead Halide Perovskites

Metals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 667 ◽  
Author(s):  
Edson Meyer ◽  
Dorcas Mutukwa ◽  
Nyengerai Zingwe ◽  
Raymond Taziwa
Keyword(s):  
Solar Cells ◽  
Perovskite Solar Cells ◽  
Lead Free ◽  
Double Perovskites ◽  
Stability Properties ◽  
Perovskite Materials ◽  
Halide Perovskites ◽  
Halide Perovskite ◽  
Light Absorbers ◽  
Lead Halide

Perovskite solar cells employ lead halide perovskite materials as light absorbers. These perovskite materials have shown exceptional optoelectronic properties, making perovskite solar cells a fast-growing solar technology. Perovskite solar cells have achieved a record efficiency of over 20%, which has superseded the efficiency of Gräztel dye-sensitized solar cell (DSSC) technology. Even with their exceptional optical and electric properties, lead halide perovskites suffer from poor stability. They degrade when exposed to moisture, heat, and UV radiation, which has hindered their commercialization. Moreover, halide perovskite materials consist of lead, which is toxic. Thus, exposure to these materials leads to detrimental effects on human health. Halide double perovskites with A2B′B″X6 (A = Cs, MA; B′ = Bi, Sb; B″ = Cu, Ag, and X = Cl, Br, I) have been investigated as potential replacements of lead halide perovskites. This work focuses on providing a detailed review of the structural, optical, and stability properties of these proposed perovskites as well as their viability to replace lead halide perovskites. The triumphs and challenges of the proposed lead-free A2B′B″X6 double perovskites are discussed here in detail.

scholarly journals From Lead Halide Perovskites to Lead‐Free Metal Halide Perovskites and Perovskite Derivatives

2019 ◽  
Vol 31 (47) ◽  
pp. 1803792 ◽  
Author(s):  
Zewen Xiao ◽  
Zhaoning Song ◽  
Yanfa Yan
Keyword(s):  
Metal Halide ◽  
Lead Free ◽  
Halide Perovskites ◽  
Free Metal ◽  
Lead Halide

scholarly journals Water-Assisted Synthesis of Lead-Free Cu Based Fluorescent Halide Perovskite Nanostructures

2021 ◽  
Author(s):  
Hari Shankar ◽  
Abha Jha ◽  
Prasenjit Kar
Keyword(s):  
Lead Free ◽  
Pb Toxicity ◽  
Perovskite Nanocrystals ◽  
Emission Properties ◽  
Commercial Use ◽  
Halide Perovskite ◽  
Lead Halide

Lead halide perovskite nanocrystals (NCs) are eminent for their emission properties, but lead (Pb) toxicity and moisture instability become an impediment to their commercial use. To resolve these obstacles and...

Investigation of Emission Behaviour of Perovskite Nanocrystals into TiO2 Nano to Microsphere

2021 ◽  
Author(s):  
Abha Jha ◽  
Hari Shankar ◽  
Prasenjit Kar
Keyword(s):  
Optoelectronic Devices ◽  
Promising Material ◽  
Perovskite Nanocrystals ◽  
Term Stability ◽  
Long Term Stability ◽  
Halide Perovskites ◽  
Lead Halide

Organic-inorganic methylammonium lead halide perovskites nanocrystals have emerged as a promising material for optoelectronic devices. But due to the lack of long-term stability of perovskite nanocrystals, its applications have been...

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...

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