scholarly journals A reversible and fast-responsive humidity sensor based on a lead-free Cs2TeCl6 double perovskite

2021 ◽  
Vol 2 (3) ◽  
pp. 1043-1049
Author(s):  
Chaojie Pi ◽  
Xue Yu ◽  
Weiqing Chen ◽  
Liuli Yang ◽  
Chao Wang ◽  
...  
Keyword(s):  
Carrier Mobility ◽  
Humidity Sensor ◽  
Double Perovskite ◽  
High Conductivity ◽  
Lead Free ◽  
Sensor Applications ◽  
Halide Perovskites ◽  
Lead Halide

Owing to their high conductivity and carrier mobility, the outstanding achievements of lead halide perovskites have been demonstrated in humidity sensor applications.

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 Perovskite solar cells have achieved a record efficiency of over 20%, which has superseded the efficiency of Gräztel dye-sensitized solar cell (DSSC) technology.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.

Dual-source vapor-processed blue-emissive cesium copper iodine microplatelets with high crystallinity and stability

2021 ◽  
Author(s):  
Jingjing Yan ◽  
Jingli Ma ◽  
Mengyao Zhang ◽  
Ruoting Yang ◽  
Xu Chen ◽  
...  
Keyword(s):  
Low Temperature ◽  
Carrier Mobility ◽  
Processing Technique ◽  
Tunable Bandgap ◽  
Low Temperature Processing ◽  
Dual Source ◽  
High Carrier Mobility ◽  
High Carrier ◽  
Halide Perovskites ◽  
Lead Halide

Recently, hybrid lead-halide perovskites have attracted extensive attention because of their unique optoelectronic characteristics, such as ambipolar charge transport, tunable bandgap, high carrier mobility, low-temperature processing technique, and so on....

scholarly journals Photoluminescence Characteristics of Sn2+ and Ce3+-Doped Cs2SnCl6 Double-Perovskite Crystals

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1501 ◽  
Author(s):  
Hongdan Zhang ◽  
Ludan Zhu ◽  
Jun Cheng ◽  
Long Chen ◽  
Chuanqi Liu ◽  
...  
Keyword(s):  
Decay Curve ◽  
Double Perovskite ◽  
Fluorescence Decay ◽  
Precipitation Method ◽  
Phase Precipitation ◽  
Fluorescence Decay Curve ◽  
Low Toxicity ◽  
Halide Perovskites ◽  
Lead Halide ◽  
Poor Stability

In recent years, all-inorganic lead-halide perovskites have received extensive attention due to their many advantages, but their poor stability and high toxicity are two major problems. In this paper, a low toxicity and stable Cs2SnCl6 double perovskite crystals were prepared by aqueous phase precipitation method using SnCl2 as precursor. By the XRD, ICP-AES, XPS, photoluminescence and absorption spectra, the fluorescence decay curve, the structure and photoluminescence characteristics of Ce3+-doped and undoped samples have been investigated in detail. The results show that the photoluminescence originates from defects. [ S n S n 4 + 2 + +VCl] defect complex in the crystal is formed by Sn2+ substituting Sn4+. The number of defects formed by Sn2+ in the crystal decreases with Ce3+ content increases. Within a certain number of defects, the crystal luminescence is enhanced with the number of [ S n S n 4 + 2 + +VCl] decreased. When Ce3+ is incorporated into the crystals, the defects of [ C e 3 + S n 4 + +VCl] and [ S n S n 4 + 2 + +VCl] were formed and the crystal show the strongest emission. This provides a route to enhance the photoluminescence of Cs2SnCl6 double perovskite crystals.

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 Magnetizing lead-free halide double perovskites

2020 ◽  
Vol 6 (45) ◽  
pp. eabb5381
Author(s):  
Weihua Ning ◽  
Jinke Bao ◽  
Yuttapoom Puttisong ◽  
Fabrizo Moro ◽  
Libor Kobera ◽  
...  
Keyword(s):  
High Speed ◽  
Double Perovskite ◽  
Lead Free ◽  
Great Success ◽  
Double Perovskites ◽  
Temperature Dependent ◽  
Magnetic Elements ◽  
Halide Perovskites ◽  
New Generation ◽  
Further Development

Spintronics holds great potential for next-generation high-speed and low–power consumption information technology. Recently, lead halide perovskites (LHPs), which have gained great success in optoelectronics, also show interesting magnetic properties. However, the spin-related properties in LHPs originate from the spin-orbit coupling of Pb, limiting further development of these materials in spintronics. Here, we demonstrate a new generation of halide perovskites, by alloying magnetic elements into optoelectronic double perovskites, which provide rich chemical and structural diversities to host different magnetic elements. In our iron-alloyed double perovskite, Cs2Ag(Bi:Fe)Br6, Fe3+ replaces Bi3+ and forms FeBr6 clusters that homogenously distribute throughout the double perovskite crystals. We observe a strong temperature-dependent magnetic response at temperatures below 30 K, which is tentatively attributed to a weak ferromagnetic or antiferromagnetic response from localized regions. We anticipate that this work will stimulate future efforts in exploring this simple yet efficient approach to develop new spintronic materials based on lead-free double perovskites.

Probing the Emissive Behaviour of Lead-free Cs2AgBiCl6 Double Perovskite with Cu (II) Doping

2021 ◽  
Author(s):  
Sukanya Ghosh ◽  
Gaurav Kumar Nim ◽  
Hari Shankar ◽  
Prasenjit Kar
Keyword(s):  
Optical Properties ◽  
Double Perovskite ◽  
Lead Free ◽  
Perovskite Materials ◽  
Tremendous Importance ◽  
Synthesis Procedure ◽  
Lead Halide ◽  
Poor Stability

In last few years, lead halide based perovskite materials have gained tremendous importance due to excellent optical properties and easy synthesis procedure. But poor stability in presence of heat, moisture,...

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...

Lead-free halide perovskites: review of structure-property relationship, and applications in light emitting devices and radiation detectors

2021 ◽  
Author(s):  
Yuting Gao ◽  
Yufeng Pan ◽  
Feng Zhou ◽  
Guangda Niu ◽  
Chunjie Yan
Keyword(s):  
Radiation Detectors ◽  
Lead Free ◽  
Structure Property ◽  
Excellent Performance ◽  
Widespread Application ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Structure Property Relationship ◽  
Halide Perovskites ◽  
Lead Halide

Lead halide perovskites have demonstrated excellent performance for light emitting diodes and detectors. However, the toxicity of lead (Pb) in the devices severely impedes their widespread application and commercialization. The...

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.

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