scholarly journals Surface Analytical Investigation on Organometal Triiodide Perovskite

2016 ◽  
Vol 1735 ◽  
Author(s):  
Youzhen Li ◽  
Xuemei Xu ◽  
Chenggong Wang ◽  
Congong Wang ◽  
Fangyan Xie ◽  
...  
Keyword(s):  
Good Method ◽  
Atomic Ratio ◽  
Analytical Investigation ◽  
High Quality ◽  
Solar Cell Performance ◽  
X Ray ◽  
Surface And Interface ◽  
Halide Perovskites ◽  
Lead Halide ◽  
The Ideal

ABSTRACTLead halide perovskites have proven their great power conversion efficiency (PCE) in the last few years and attracted more and more attentions. Evaporation is an important method to get high quality perovskite films, especially for surface and interface investigation, which is important for the solar cell performance. In this paper, we present our investigations on growing PbI2 and CH3NH3I films by evaporation, and then CH3NH3PbI3 films by co-evaporation. X-ray photoemisson spectroscopy (XPS) was used to characterize the films. The results showed that CH3NH3I film was not stable in vacuum. Both N and I decreased in vacuum with time elapsing. PbI2 and CH3NH3PbI3 films are quite stable. The atomic ratio of CH3NH3PbI3 films (C: N: Pb: I =1.29:1.07:1.00:2.94) is very close to the ideal CH3NH3PbI3, which indicates that evaporation is a good method to get high quality perovskite films with accurate atomic ratio.

Room temperature formation of organic–inorganic lead halide perovskites: design of nanostructured and highly reactive intermediates

2017 ◽  
Vol 5 (7) ◽  
pp. 3599-3608 ◽  
Author(s):  
Hong Zhang ◽  
Dan Li ◽  
Jiaqi Cheng ◽  
Francis Lin ◽  
Jian Mao ◽  
...  
Keyword(s):  
Room Temperature ◽  
Theoretical Study ◽  
Reactive Intermediates ◽  
High Quality ◽  
Inorganic Lead ◽  
Halide Perovskites ◽  
Lead Halide ◽  
The Ideal

We propose a room-temperature scheme of ligand-promoted formation of high-quality perovskite films through the judicious design of nanostructured PbI2·(L)x intermediates, where L denotes the ligand. The mechanisms and features of the ideal ligand have been investigated through a combined experimental and theoretical study.

scholarly journals Detection of X-ray photons by solution-processed lead halide perovskites

2015 ◽  
Vol 9 (7) ◽  
pp. 444-449 ◽  
Author(s):  
Sergii Yakunin ◽  
Mykhailo Sytnyk ◽  
Dominik Kriegner ◽  
Shreetu Shrestha ◽  
Moses Richter ◽  
...  
Keyword(s):  
Solution Processed ◽  
X Ray ◽  
Halide Perovskites ◽  
Lead Halide

Reducing the leakage current for a CsPbBr3 detector via asymmetric area electrodes and heterostructures

2021 ◽  
Author(s):  
YingFeng Ruan ◽  
Pengju Guo ◽  
Zhiping Zheng ◽  
Qiuyun Fu ◽  
Rongda Zhou ◽  
...  
Keyword(s):  
Leakage Current ◽  
Room Temperature ◽  
Next Generation ◽  
Typical Representative ◽  
X Ray ◽  
Inorganic Lead ◽  
Halide Perovskites ◽  
Lead Halide

As a typical representative of all-inorganic lead halide perovskites, cesium lead bromine (CsPbBr3) has been regarded as the workhorse of next-generation room temperature X-ray detectors in recent years.

Enhanced Photoluminescence and Solar Cell Performance via Lewis Base Passivation of Organic–Inorganic Lead Halide Perovskites

ACS Nano ◽  
2014 ◽  
Vol 8 (10) ◽  
pp. 9815-9821 ◽  
Author(s):  
Nakita K. Noel ◽  
Antonio Abate ◽  
Samuel D. Stranks ◽  
Elizabeth S. Parrott ◽  
Victor M. Burlakov ◽  
...  
Keyword(s):  
Solar Cell ◽  
Lewis Base ◽  
Cell Performance ◽  
Solar Cell Performance ◽  
Enhanced Photoluminescence ◽  
Inorganic Lead ◽  
Halide Perovskites ◽  
Lead Halide

Synthesis and Characterization of CH3NH3Pb1-xSnxI3 Crystal

2016 ◽  
Vol 847 ◽  
pp. 148-152
Author(s):  
Ju Long Chen ◽  
Guang Xing Liang ◽  
Ping Fan ◽  
Ting Ting Mao ◽  
Di Gu
Keyword(s):  
Photovoltaic Performance ◽  
Energy Dispersive Spectrum ◽  
Atomic Ratio ◽  
Stoichiometric Ratio ◽  
X Ray Diffraction ◽  
X Ray ◽  
Environmental Friendly ◽  
Absorbing Layer ◽  
The Ideal

The CH3NH3PbI3 light-absorbing layer shows preferably photovoltaic performance. However, comparing with CH3NH3PbI3 film, the CH3NH3SnI3 film show smaller band gap and wider light absorption range, meanwhile, it is non-toxic and environmental friendly solar cell material. In this paper, different proportions of tin (Sn) was doped into CH3NH3PbI3 film, the atomic ratio of lead-tin strictly controlled to form CH3NH3SnI3 from CH3NH3PbI3. The five different proportions of doping CH3NH3Pb1-xSnxI3 perovskite powders were studied. The morphology of powders was observed by scanning electron microscopy (SEM). X-ray diffraction (XRD) and energy dispersive spectrum (EDS) were used to analyze the crystallization and the proportion composition of powders, respectively. The experimental results show that the powder crystal orientation was very obvious at the ratio of lead-tin around 1:1.99 and the atomic ratio close to the ideal stoichiometric ratio of doped atoms.

scholarly journals Size Isn’t Everything - Compositional Variation in Hybrid Organic-Inorganic Lead Halide Perovskites: Kinetically- versus Thermodynamically-controlled Synthesis

2021 ◽  
Author(s):  
Jiyu Tian ◽  
Eli Zysman-Colman ◽  
Finlay Morrison
Keyword(s):  
Solid Solution ◽  
Solid Solutions ◽  
Compositional Variation ◽  
X Ray Diffraction ◽  
Solid Solution Formation ◽  
X Ray ◽  
H Nmr ◽  
Halide Perovskites ◽  
A Site ◽  
Lead Halide

<p>The formation and study of a partial solid solution <a></a><a>Az<sub>1-<i>x</i></sub>FA<i><sub>x</sub></i>PbBr<sub>3</sub></a>, using ‘similar’ sized cations azetidinium (Az<sup>+</sup>) and formamidinium (FA<sup>+</sup>), was explored via mechanosynthesis and precipitation synthesis. The composition and lattice parameters of samples from both syntheses were analysed by <sup>1</sup>H NMR and Rietveld refinement of the powder X-ray diffraction. A clear mismatch in the composition of the perovskite was found between the precipitated samples and the corresponding solutions. Such a mismatch was not observed for samples obtained via mechanosynthesis. The discrepancy suggests products are kinetically-controlled during precipitation, compared to thermodynamically-controlled mechanosynthesis. Furthermore, the cell volume as a function of composition in both 6H (Az-rich) and 3C (FA-rich) solid solutions suggests that FA<sup>+</sup> is actually smaller than Az<sup>+</sup>, contradicting the literature. In the 3C (Az-poor) solid solutions, the extent of Az<sub>1-<i>x</i></sub>FA<i><sub>x</sub></i>PbBr<sub>3 </sub>is unexpectedly smaller than Az<sub>1-<i>x</i></sub>MA<i><sub>x</sub></i>PbBr<sub>3</sub>, again in contradiction to the expectation based on the reported cation sizes. These results indicate that other factors, as yet unidentified, must also contribute to the solid solution formation of organic-inorganic hybrid perovskites, not simply the relative sizes of the A-site cations.</p>

scholarly journals Progressive Polytypism and Bandgap Tuning in Azetidinium Lead Halide Perovskites

2021 ◽  
Author(s):  
Jiyu Tian ◽  
David Cordes ◽  
Alexandra Slawin ◽  
Eli Zysman-Colman ◽  
Finlay Morrison
Keyword(s):  
Linear Variation ◽  
Ambient Conditions ◽  
X Ray Diffraction ◽  
X Ray ◽  
Vegard’S Law ◽  
The Family ◽  
Halide Perovskites ◽  
Diffraction Patterns ◽  
Bandgap Tuning ◽  
Lead Halide

<div><div><div><p>Mixed halide azetidinium lead perovskites AzPbBr<sub>3-<i>x</i></sub>X<i><sub>x</sub></i> (X = Cl or I) were obtained by mechanosynthesis. With varying halide composition from Cl- to Br- to I-; the chloride and bromide analogs both form in the hexagonal 6H polytype while the iodide adopts the 9R polytype. An intermediate 4H polytype is observed for mixed Br/I compositions. Overall the structure progresses from 6H to 4H to 9R perovskite polytype with varying halide composition. Rietveld refinement of the powder X-ray diffraction patterns revealed a linear variation in unit cell volume as a function of the average radius of the anion, which is not only observed within the solid solution of each polytype (according to Vegard’s law) but extends uniformly across all three polytypes. This is correlated with a progressive (linear) tuning of the bandgap from 3.41 to 2.00 eV. Regardless of halide, the family of azetidinium halide perovskite polytypes are highly stable, with no discernible change in properties over more than 6 months under ambient conditions</p></div></div></div>

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