Organometallic Halide Perovskite Synthesis in Polymer Melt for Improved Stability in High Humidity

MRS Advances ◽  
2016 ◽  
Vol 1 (47) ◽  
pp. 3207-3213 ◽  
Author(s):  
John P. Murphy ◽  
Jessica M. Andriolo ◽  
Brandon M. Ross ◽  
Gary F. Wyss ◽  
Nicole E. Zander ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Elemental Analysis ◽  
Synthesis Method ◽  
Polymer Melt ◽  
High Humidity ◽  
Polystyrene Matrix ◽  
Improved Stability ◽  
Moisture Sensitive ◽  
Halide Perovskite ◽  
Reversible Nature

ABSTRACTA new organometallic halide perovskite (OHP) synthesis method, whereby a polymer melt is used to thermodynamically drive the reaction that forms OHP crystallites, is demonstrated. The synthesis method allows for the facile encapsulation of moisture-sensitive OHP without the loss of simplicity during fabrication, which makes OHP materials so attractive for the photovoltaic industry. Degradation of OHP crystallites embedded in a polystyrene matrix was studied using UV-Vis absorbance over a period of several days. The OHP crystallites degrade as a result of the reversible nature of the reaction that forms the crystallites. After the reversion to precursors (PbI2 and CH3NH3I) the CH3NH3I irreversibly degrades [2] allowing the degradation to be tracked via optical interrogation. Additionally, surface morphology and elemental analysis of fabricated samples was carried out using SEM/EDS techniques.

Surface passivation of mixed-halide perovskite CsPb(BrxI1−x)3 nanocrystals by selective etching for improved stability

Nanoscale ◽  
2017 ◽  
Vol 9 (22) ◽  
pp. 7391-7396 ◽  
Author(s):  
Qiang Jing ◽  
Mian Zhang ◽  
Xiang Huang ◽  
Xiaoming Ren ◽  
Peng Wang ◽  
...  
Keyword(s):  
Surface Passivation ◽  
Selective Etching ◽  
Improved Stability ◽  
Halide Perovskite

Force-assembled triboelectric nanogenerator with high-humidity-resistant electricity generation using hierarchical surface morphology

Nano Energy ◽  
2016 ◽  
Vol 20 ◽  
pp. 283-293 ◽  
Author(s):  
Dongjin Jang ◽  
Younghoon Kim ◽  
Tae Yun Kim ◽  
Kunsuk Koh ◽  
Unyong Jeong ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Electricity Generation ◽  
Triboelectric Nanogenerator ◽  
High Humidity

scholarly journals Mixed-Solvent Polarity-Assisted Phase Transition of Cesium Lead Halide Perovskite Nanocrystals with Improved Stability at Room Temperature

Nanomaterials ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1537 ◽  
Author(s):  
Rui Yun ◽  
Li Luo ◽  
Jingqi He ◽  
Jiaxi Wang ◽  
Xiaofen Li ◽  
...  
Keyword(s):  
Phase Transition ◽  
Surface Defects ◽  
Defect Density ◽  
Solvent Polarity ◽  
Electrical Performance ◽  
Ammonium Bromide ◽  
Perovskite Nanocrystals ◽  
Improved Stability ◽  
Halide Perovskite ◽  
Lead Halide

Cesium lead halide perovskite nanocrystals (NCs) have attracted enormous interest in light-emitting diode, photodetector and low-threshold lasing application in terms of their unique optical and electrical performance. However, little attention has been paid to other structures associated with CsPbBr3, such as CsPb2Br5. Herein, we realize a facile method to prepare dual-phase NCs with improved stability against polar solvents by replacing conventional oleylamine with cetyltrimethyl ammonium bromide (CTAB) in the reprecipitation process. The growth of NCs can be regulated with different ratios of toluene and ethanol depending on solvent polarity, which not only obtains NCs with different sizes and morphologies, but also controls phase transition between orthorhombic CsPbBr3 and tetragonal CsPb2Br5. The photoluminescence (PL) and defect density calculated exhibit considerable solvent polarity dependence, which is ascribed to solvent polarity affecting the ability of CTAB to passivate surface defects and improve stoichiometry in the system. This new synthetic method of perovskite material will be helpful for further studies in the field of lighting and detectors.

Fabrication of Highly Stable Fully-Inorganic Halide Perovskite Films for Optoelectronic Application

2020 ◽  
Vol 20 (12) ◽  
pp. 7724-7729
Author(s):  
Jung Hyeon Yoo ◽  
Seong Guk Jeong ◽  
Hyun Bin Kim ◽  
Seung Hee Choi ◽  
Seok Bin Kwon ◽  
...  
Keyword(s):  
Critical Issue ◽  
White Leds ◽  
Optoelectronic Application ◽  
Stable Cesium ◽  
Optical Adhesive ◽  
Improved Stability ◽  
Stability Issue ◽  
Halide Perovskites ◽  
Halide Perovskite ◽  
The Stability

Despite the fact that stability is a critical issue affecting halide perovskite after the materials have been developed, these materials continue to be studied due to their outstanding optoelectronic characteristics such as narrow emission band width, high PLQY. Many methods are suggested and improved, but the limitations for the display and lighting applications are still remaining. Here, we propose the fabrication of stable cesium lead tri-halide (CsPbX3; X= Cl, Br, I) perovskite films using photocurable polyurethane material, norland optical adhesive 63 (NOA 63), to generate white LEDs by placing films on the InGaN 450 nm blue chip. Comparing with the conventional perovskites, fabricated films well maintained the luminescence properties such as full widths at half maximum (FWHM) of 18 nm and 31 nm for green and red films, respectively. For the stability issue, pristine perovskite without encapsulation is decomposed immediately at high humidity and temperature, but NOA 63 encapsulated perovskite maintained a PL emission property of 60% after four hours in artificial atmosphere. The CIE color triangle reached ~119% of the NTSC standard, exhibiting high color purity. From the results, we confirm that the NOA 63 encapsulated halide perovskites are beneficial when applied in optoelectronic applications due to their improved stability and maintained characteristics.

scholarly journals Effect of the Gallium and Vanadium on the Dibenzothiophene Hydrodesulfurization and Naphthalene Hydrogenation Activities Using Sulfided NiMo-V2O5/Al2O3-Ga2O3

Catalysts ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 894 ◽  
Author(s):  
Esneyder Puello-Polo ◽  
Yina Pájaro ◽  
Edgar Márquez
Keyword(s):  
Elemental Analysis ◽  
Rate Constants ◽  
Active Sites ◽  
Sol Gel ◽  
Synthesis Method ◽  
Textural Properties ◽  
Elemental Mapping ◽  
Sulfided Catalysts ◽  
Nimo Catalysts ◽  
Sol Gel Synthesis

The effect of Ga and V as support-modifier and promoter of NiMoV/Al2O3-Ga2O3 catalyst on hydrogenation (HYD) and hydrodesulfurization (HDS) activities was studied. The catalysts were characterized by elemental analysis, textural properties, XRD, XPS, EDS elemental mapping and High-resolution transmission electron microscopy (HRTEM). The chemical analyses by X-ray Fluorescence (XRF) and CHNS-O elemental analysis showed results for all compounds in agreement, within experimental accuracy, according to stoichiometric values proposed to Mo/Ni = 6 and (V+Ni)/(V+Ni+Mo) = 0.35. The sol-gel synthesis method increased the surface area by incorporation of Ga3+ ions into the Al2O3 forming Ga-O-Al bonding; whereas the impregnation synthesis method leads to decrease by blocking of alumina pores, as follows NiMoV/Al-Ga(1%-I) < NiMoV/Al-Ga(1%-SG) < NiMo/Al2O3 < Al2O3-Ga2O3(1%-I) < Al2O3-Ga2O3(1%-SG) < Al2O3, propitiating Dp-BJH between 6.18 and 7.89 nm. XRD confirmed a bulk structure typical of (NH4)4[NiMo6O24H6]•5H2O and XPS the presence at the surface of Mo4+, Mo6+, NixSy, Ni2+, Ga3+ and V5+ species, respectively. The EDS elemental mapping confirmed that Ni, Mo, Al, Ga, V and S are well-distributed on Al2O3-Ga2O3(1%-SG) support. The HRTEM analysis shows that the length and stacking distribution of MoS2 crystallites varied from 5.07 to 5.94 nm and 2.74 to 3.58 with synthesis method (SG to I). The results of the characterization sulfided catalysts showed that the synthesis method via impregnation induced largest presence of gallium on the surface influencing the dispersion V5+ species, this effect improves the dispersion of the MoS2 phase and increasing the number of active sites, which correlates well with the dibenzothiophene HDS and naphthalene HYD activities. The dibenzothiophene HDS activities with overall pseudo-first-order rate constants’ values (kHDS) from 1.65 to 7.07 L/(h·mol·m2) follow the order: NiMoV-S/Al-Ga(1%-I) < NiMo-S/Al2O3 < NiMoV-S/Al-Ga(1%-SG), whereas the rate constants’ values (k) of naphthalene HYD from 0.022 to 2.23 L/(h·mol·m2) as follow: NiMoV-S/Al-Ga(1%-SG) < NiMo-S/Al2O3 < NiMoV-S/Al-Ga(1%-I). We consider that Ga and V act as structural promoters in the NiMo catalysts supported on Al2O3 that allows the largest generation of BRIM sites for HYD and CUS sites for DDS.

scholarly journals High-performance Wide Bandgap Perovskite Solar Cells Fabricated in Ambient High-Humidity Conditions

2021 ◽  
Author(s):  
Ugur Deneb Menda ◽  
Guilherme Ribeiro ◽  
Daniela Nunes ◽  
Tomás Calmeiro ◽  
Hugo Águas ◽  
...  
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
High Performance ◽  
State Of The Art ◽  
Power Conversion ◽  
Perovskite Solar Cells ◽  
Wide Bandgap ◽  
High Humidity ◽  
Halide Perovskite ◽  
Lead Halide

Lead-halide perovskite solar cells (PSCs) are currently the most promising emergent thin-film photovoltaic technology, having already reached power conversion efficiency (PCE) levels of state-of-the-art wafer-based silicon cells. The class of...

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