MODULATING CH3NH3PbI3 PEROVSKITE CRYSTALLIZATION BEHAVIOR THROUGH PRECURSOR CONCENTRATION

NANO ◽  
2014 ◽  
Vol 09 (05) ◽  
pp. 1440003 ◽  
Author(s):  
KUNWU FU ◽  
SWEE SIEN LIM ◽  
YANAN FANG ◽  
PABLO P. BOIX ◽  
NRIPAN MATHEWS ◽  
...  
Keyword(s):  
Precursor Solution ◽  
Solution Concentration ◽  
Crystallographic Analysis ◽  
Precursor Concentration ◽  
Device Performance ◽  
Photovoltaic Devices ◽  
Solar Cell Device ◽  
Visible Wavelength Range ◽  
Precursor Solution Concentration ◽  
Perovskite Lattice

Perovskite-based photovoltaic devices have recently achieved impressively high efficiencies beyond 15% and gained great interest. We show here the formation of perovskite cluster overlayer structures which consist of individual perovskite grains on top of mesoporous TiO 2 films, coexisting with the randomly distributed nanocrystals within the films. Perovskite solution concentration was found to play an important role in modulating the perovskite crystallization and cluster overlayer formation process. Absorbance increase in visible wavelength range and shift of photoluminescence (PL) responses of perovskite films due to the effect of precursor concentration change were observed and investigated in detail. The crystallographic analysis of the CH 3 NH 3 PbI 3 films shows a gradual decrease of the perovskite lattice parameters and shrinkage of unit volume as precursor solution concentration increases, which is correlated to the changes of optical properties. Finally, perovskite-based solar cell device performance was enhanced at higher precursor concentration.

scholarly journals Impact of Perovskite Composition on Film Formation Quality and Photophysical Properties for Flexible Perovskite Solar Cells

Molecules ◽  
2020 ◽  
Vol 25 (3) ◽  
pp. 732 ◽  
Author(s):  
Guangdong Li ◽  
Xiaoping Zou ◽  
Jin Cheng ◽  
Dan Chen ◽  
Yujun Yao ◽  
...  
Keyword(s):  
Solar Cells ◽  
Film Formation ◽  
Photophysical Properties ◽  
Perovskite Solar Cells ◽  
Precursor Solution ◽  
Solution Concentration ◽  
Precursor Solution Concentration ◽  
Composition Optimization ◽  
A Site ◽  
Low Temperature Process

In recent years, flexible perovskite solar cells have drawn tremendous attention in the field of wearable devices, and optimization of perovskite composition plays an important role in improving film quality and photophysical properties. At present, some researchers have only studied A-site organic cations mixing or X-site halide anions mixing in the ABX3 structure of perovskite, but there are few reports on co-mixing of A-site and X-site ions in flexible perovskite solar cells. In this paper, we mainly try to study the effects of different concentrations of mixed formamidine methylamine halide (FAxMA1-xBrxClyI1-x-y) precursor solutions on the quality and photophysical properties of perovskite films under low temperature process. We conclude that the film quality and photophysical properties reached the best results when the optimized precursor solution concentration was 60:6:6. The investigation on composition optimization in this experiment laid the foundation for the improvement of the performance of flexible perovskite solar cells. We also use the results of this experiment to prepare flexible perovskite solar cells based on carbon electrodes, which are expected to be applied in other flexible optoelectronic or electro-optical devices.

Desulfurization and Regeneration Performance of Sorbent Prepared by Subcritical Water Impregnation

2013 ◽  
Vol 743-744 ◽  
pp. 443-448
Author(s):  
Hao Chen Qin ◽  
Lian Wei Liu ◽  
Wei Ping Si ◽  
Li Ping Chang ◽  
Wei Ren Bao ◽  
...  
Keyword(s):  
Subcritical Water ◽  
Precursor Solution ◽  
Nitrogen Adsorption ◽  
Solution Concentration ◽  
X Ray Diffraction ◽  
Active Components ◽  
Precursor Solution Concentration ◽  
Impregnation Time ◽  
Mechanical Strengths ◽  
Autoclave Reactor

A series of metal oxides sorbents supported on γ-Al2O3 were directly prepared by subcritical water impregnation (SCWI) method using an autoclave reactor. The effects of active components, preparation pressure, temperature, and time on the desulfurization activity of sorbents in hot coal-based gases at mid-temperature were investigated. The samples were characterized by X-ray diffraction (XRD), nitrogen adsorption and atomic absorption spectrophotometer (AAS). The results showed that Mn-based sorbent loaded on γ-Al2O3 by SCWI presented a good desulfurization performance. The optimal preparation parameters of sorbent were the temperature of 350 °C, the pressure of 18.9 MPa, impregnation time of 30 min, the precursor solution concentration of 0.287 mol/L and the volume of 100 ml, respectively. The Mn/γ-Al2O3 sorbent prepared under the optimal conditions presented a good desulfurization precision and regeneration performance. After regeneration, the mechanical strengths of the sorbents were higher than that of raw support and the breakthrough time at the desulfurization efficiency of above 99% was not obviously decreased.

scholarly journals Effect of Precursor Solution Concentration at Spincasting on Physical Properties of Polystyrene Ultra-Thin Films

2010 ◽  
Vol 67 (11) ◽  
pp. 626-631 ◽  
Author(s):  
Seisuke ATA ◽  
Rikki HONMA ◽  
Kenji ITO ◽  
Yoshinori KOBAYASHI ◽  
Toshiaki OUGIZAWA
Keyword(s):  
Thin Films ◽  
Physical Properties ◽  
Precursor Solution ◽  
Solution Concentration ◽  
Precursor Solution Concentration
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