scholarly journals Photon Energy-Dependent Hysteresis Effects in Lead Halide Perovskite Materials

2017 ◽  
Vol 121 (47) ◽  
pp. 26180-26187 ◽  
Author(s):  
Meysam Pazoki ◽  
T. Jesper Jacobsson ◽  
Silver H. T. Cruz ◽  
Malin B. Johansson ◽  
Roghayeh Imani ◽  
...  
Keyword(s):  
Photon Energy ◽  
Perovskite Materials ◽  
Halide Perovskite ◽  
Energy Dependent ◽  
Lead Halide

scholarly journals Solid-State NMR and NQR Spectroscopy of Lead-Halide Perovskite Materials

2020 ◽  
Vol 142 (46) ◽  
pp. 19413-19437
Author(s):  
Laura Piveteau ◽  
Viktoriia Morad ◽  
Maksym V. Kovalenko
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Perovskite Materials ◽  
Halide Perovskite ◽  
Lead Halide

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 Perovskite solar cells have achieved a record efficiency of over 20%, which has superseded the efficiency of Gräztel dye-sensitized solar cell (DSSC) technology.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 Lasing in robust cesium lead halide perovskite nanowires

2016 ◽  
Vol 113 (8) ◽  
pp. 1993-1998 ◽  
Author(s):  
Samuel W. Eaton ◽  
Minliang Lai ◽  
Natalie A. Gibson ◽  
Andrew B. Wong ◽  
Letian Dou ◽  
...  
Keyword(s):  
Device Fabrication ◽  
Ambient Atmosphere ◽  
Light Sources ◽  
Ambient Conditions ◽  
Perovskite Materials ◽  
Wavelength Tunability ◽  
Halide Perovskite ◽  
Nanoscale Lasers ◽  
Lead Halide ◽  
Excellent Stability

The rapidly growing field of nanoscale lasers can be advanced through the discovery of new, tunable light sources. The emission wavelength tunability demonstrated in perovskite materials is an attractive property for nanoscale lasers. Whereas organic–inorganic lead halide perovskite materials are known for their instability, cesium lead halides offer a robust alternative without sacrificing emission tunability or ease of synthesis. Here, we report the low-temperature, solution-phase growth of cesium lead halide nanowires exhibiting low-threshold lasing and high stability. The as-grown nanowires are single crystalline with well-formed facets, and act as high-quality laser cavities. The nanowires display excellent stability while stored and handled under ambient conditions over the course of weeks. Upon optical excitation, Fabry–Pérot lasing occurs in CsPbBr3 nanowires with an onset of 5 μJ cm−2 with the nanowire cavity displaying a maximum quality factor of 1,009 ± 5. Lasing under constant, pulsed excitation can be maintained for over 1 h, the equivalent of 109 excitation cycles, and lasing persists upon exposure to ambient atmosphere. Wavelength tunability in the green and blue regions of the spectrum in conjunction with excellent stability makes these nanowire lasers attractive for device fabrication.

High-performance perovskite memristor based on methyl ammonium lead halides

2016 ◽  
Vol 4 (7) ◽  
pp. 1375-1381 ◽  
Author(s):  
Kai Yan ◽  
Ming Peng ◽  
Xiao Yu ◽  
Xin Cai ◽  
Si Chen ◽  
...  
Keyword(s):  
High Performance ◽  
Perovskite Materials ◽  
Halide Perovskite ◽  
Lead Halide

High-performance memristors were fabricated based on methyl ammonium lead halide perovskite materials and achieved an on–off ratio of 1.9 × 109.

scholarly journals Origin and Fundamentals of Perovskite Solar Cells

2020 ◽  
Author(s):  
Mohd Quasim Khan ◽  
Khursheed Ahmad
Keyword(s):  
Solar Cells ◽  
Power Conversion Efficiency ◽  
Conversion Efficiency ◽  
Power Conversion ◽  
Perovskite Solar Cells ◽  
Energy Requirements ◽  
Highly Efficient ◽  
Perovskite Materials ◽  
Halide Perovskite ◽  
Lead Halide

In the last few decades, the energy demand has been increased dramatically. Different forms of energy have utilized to fulfill the energy requirements. Solar energy has been proven an effective and highly efficient energy source which has the potential to fulfill the energy requirements in the future. Previously, various kind of solar cells have been developed. In 2013, organic–inorganic metal halide perovskite materials have emerged as a rising star in the field of photovoltaics. The methyl ammonium lead halide perovskite structures were employed as visible light sensitizer for the development of highly efficient perovskite solar cells (PSCs). In 2018, the highest power conversion efficiency of 23.7% was achieved for methyl ammonium lead halide based PSCs. This obtained highest power conversion efficiency makes them superior over other solar cells. The PSCs can be employed for practical uses, if their long term stability improved by utilizing some novel strategies. In this chapter, we have discussed the optoelectronic properties of the perovskite materials, construction of PSCs and recent advances in the electron transport layers for the fabrication of PSCs.

scholarly journals An inherent instability study using ab initio computational methods and experimental validation of Pb(SCN)2 based perovskites for solar cell applications

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Jayita Dutta ◽  
Mithun Chennamkulam Ajith ◽  
Soumya Dutta ◽  
Umesh R. Kadhane ◽  
Jinesh Kochupurackal B ◽  
...  
Keyword(s):  
Solar Cell ◽  
Ab Initio ◽  
Experimental Validation ◽  
Perovskite Solar Cell ◽  
Lead Iodide ◽  
Perovskite Materials ◽  
Photovoltaic Applications ◽  
Halide Perovskite ◽  
Lead Halide

Abstract Perovskite materials with ABX3 chemistries are promising candidates for photovoltaic applications, owing to their suitable optoelectronic properties. However, they are highly hydrophilic and unstable in nature, limiting the commercialization of perovskite photovoltaics. Mixed halide ion-doped perovskites are reported to be more stable compared to simple ABX3 chemistries. This paper describes ab initio modeling, synthesis, and characterization of thiocyanate doped lead iodide CH3NH3PbI(3−x)(SCN)x perovskites. Several perovskite chemistries with an increasing concentration of (SCN)− at x = 0, 0.25, 0.49, 1.0, 1.45 were evaluated. Subsequently, ‘n-i-p’ and ‘p-i-n’ perovskite solar device architectures, corresponding to x = 0, 0.25, 0.49, 1.0 thiocyanate doped lead halide perovskite chemistry were fabricated. The study shows that among all the devices fabricated for different compositions of perovskites, p-i-n perovskite solar cell fabricated using CH3NH3PbI(3−x)(SCN)x perovskite at x = 1.0 exhibited the highest stability and device efficiency was retained until 450 h. Finally, a solar panel was fabricated and its stability was monitored.

scholarly journals Compositional and Morphological Changes in Water-Induced Early-Stage Degradation in Lead Halide Perovskites

Coatings ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 535 ◽  
Author(s):  
Chen ◽  
Solanki ◽  
Pan ◽  
Sum
Keyword(s):  
Water Vapor ◽  
Grain Boundaries ◽  
Early Stage ◽  
Morphological Changes ◽  
Water Vapor Pressure ◽  
Degradation Process ◽  
Perovskite Materials ◽  
In Situ Investigation ◽  
Halide Perovskite ◽  
Lead Halide

With tremendous improvements in lead halide perovskite-based optoelectronic devices ranging from photovoltaics to light-emitting diodes, the instability problem stands as the primary challenge in their development. Among all factors, water is considered as one of the major culprits to the degradation of halide perovskite materials. For example, CH3NH3PbI3 (MAPbI3) and CH(NH2)2PbI3 (FAPbI3) decompose into PbI2 in days under ambient conditions. However, the intermediate changes of this degradation process are still not fully understood, especially the changes in early stage. Here we perform an in-situ investigation of the early-stage MAPbI3 and FAPbI3 degradation under high water vapor pressure. By probing the surface and bulk of perovskite samples using near-ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) and XRD, our findings clearly show that PbI2 formation surprisingly initiates below the top surface or at grain boundaries, thus offering no protection as a water-blocking layer on surface or grain boundaries to slow down the degradation process. Meanwhile, significant morphological changes are observed in both samples after water vapor exposure. In comparison, the integrity of MAPbI3 film degrades much faster than the FAPbI3 film against water vapor. Pinholes and large voids are found in MAPbI3 film while only small number of pinholes can be found in FAPbI3 film. However, the FAPbI3 film suffers from its phase instability, showing a fast α-to-δ phase transition. Our results highlight the importance of the compositional and morphological changes in the early stage degradation in perovskite materials.

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