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

Improved Stability of Organometal Halide Perovskite Films and Solar Cells toward Humidity via Surface Passivation with Oleic Acid

2018 ◽  
Vol 1 (2) ◽  
pp. 387-392 ◽  
Author(s):  
Ghada Abdelmageed ◽  
Heather Renee Sully ◽  
Sara Bonabi Naghadeh ◽  
Amr El-Hag Ali ◽  
Sue A. Carter ◽  
...  
Keyword(s):  
Solar Cells ◽  
Oleic Acid ◽  
Surface Passivation ◽  
Improved Stability ◽  
Organometal Halide Perovskite ◽  
Halide Perovskite

scholarly journals Surface Passivation of Organometal Halide Perovskite by Atomic Layer Deposition: a Mechanism Investigation Enabling Efficient Inverted Planar Solar Cells

2021 ◽  
Author(s):  
Ran Zhao ◽  
Kai Zhang ◽  
Jiahao Zhu ◽  
Shuang Xiao ◽  
Wei Xiong ◽  
...  
Keyword(s):  
Solar Cells ◽  
Atomic Layer Deposition ◽  
High Efficiency ◽  
Surface Passivation ◽  
Perovskite Solar Cells ◽  
Wide Band ◽  
Atomic Layer ◽  
Layer Deposition ◽  
Halide Perovskite ◽  
Interface Passivation

Interface passivation is of the pivot to achieve high-efficiency organic metal halide perovskite solar cells (PSCs). Atomic layer deposition (ALD) of wide band gap oxides has recently shown great potential...

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.

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.

scholarly journals Resolving spatial and energetic distributions of trap states in metal halide perovskite solar cells

Science ◽  
2020 ◽  
Vol 367 (6484) ◽  
pp. 1352-1358 ◽  
Author(s):  
Zhenyi Ni ◽  
Chunxiong Bao ◽  
Ye Liu ◽  
Qi Jiang ◽  
Wu-Qiang Wu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Single Crystals ◽  
Surface Passivation ◽  
Perovskite Solar Cells ◽  
Hole Transport ◽  
Metal Halide ◽  
Trap States ◽  
Deep Traps ◽  
Metal Halide Perovskite ◽  
Halide Perovskite

We report the profiling of spatial and energetic distributions of trap states in metal halide perovskite single-crystalline and polycrystalline solar cells. The trap densities in single crystals varied by five orders of magnitude, with a lowest value of 2 × 1011 per cubic centimeter and most of the deep traps located at crystal surfaces. The charge trap densities of all depths of the interfaces of the polycrystalline films were one to two orders of magnitude greater than that of the film interior, and the trap density at the film interior was still two to three orders of magnitude greater than that in high-quality single crystals. Suprisingly, after surface passivation, most deep traps were detected near the interface of perovskites and hole transport layers, where a large density of nanocrystals were embedded, limiting the efficiency of solar cells.

Surface passivation of halide perovskite nanocrystals for stable and high purity color conversion

2022 ◽  
Vol 120 (1) ◽  
pp. 011903
Author(s):  
Xianghua Wang ◽  
Wenbin Li ◽  
Xudong Zhao ◽  
Jing Fu ◽  
Guobing Zhang ◽  
...  
Keyword(s):  
High Purity ◽  
Surface Passivation ◽  
Perovskite Nanocrystals ◽  
Halide Perovskite ◽  
Color Conversion

Enhanced blue photoluminescence and photostability of Cs3Bi2Br9 perovskite quantum dots via surface passivation with silver ions

CrystEngComm ◽  
2021 ◽  
Author(s):  
Tianfeng Li ◽  
Ma Jicun ◽  
Mengdi Qiao ◽  
Yanmin Kuang ◽  
Yulu He ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Surface Passivation ◽  
Narrow Band ◽  
Lead Toxicity ◽  
Silver Ions ◽  
Practical Applications ◽  
Perovskite Quantum Dots ◽  
Halide Perovskite ◽  
Lead Halide ◽  
Blue Photoluminescence

Lead halide perovskite quantum dots (QDs) with color-tunability and narrow-band emissions are promising materials of nanophotonic and photoelectronic fields, but the lead toxicity and instability limit their practical applications. On...

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.

Exploring the surface chemistry of cesium lead halide perovskite nanocrystals

Nanoscale ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 986-999 ◽  
Author(s):  
Roberto Grisorio ◽  
Milvia Elena Di Clemente ◽  
Elisabetta Fanizza ◽  
Ignazio Allegretta ◽  
Davide Altamura ◽  
...  
Keyword(s):  
Surface Chemistry ◽  
Surface Passivation ◽  
Organic Ligands ◽  
Perovskite Nanocrystals ◽  
Halide Perovskite ◽  
Lead Halide

The surface passivation by organic ligands of differently composed cesium lead halide perovskite nanocrystals was explored.

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