Thiocyanate Containing Two-Dimensional Cesium Lead Iodide Perovskite, Cs2PbI2(SCN)2: Characterization, Photovoltaic Application, and Degradation Mechanism

2018 ◽  
Vol 10 (49) ◽  
pp. 42363-42371 ◽  
Author(s):  
Youhei Numata ◽  
Yoshitaka Sanehira ◽  
Ryo Ishikawa ◽  
Hajime Shirai ◽  
Tsutomu Miyasaka
Keyword(s):  
Degradation Mechanism ◽  
Two Dimensional ◽  
Lead Iodide ◽  
Photovoltaic Application

The Effect of Organic Cation Dynamics on the Optical Properties in (PEA)2(MA)[Pb2I7] Perovskite Dimorphs

2021 ◽  
Author(s):  
Lekina Yulia ◽  
Sai Dintakurti ◽  
Benny Febriansyah ◽  
David George Bradley ◽  
Jiaxu Yan ◽  
...  
Keyword(s):  
Phase Transition ◽  
Optical Properties ◽  
Raman Scattering ◽  
Organic Cation ◽  
Two Dimensional ◽  
Lead Iodide ◽  
Temperature Dependent ◽  
Hybrid Perovskite

Two-dimensional (2D) phenylethyl ammonium (PEA+)-methyl ammonium (MA+) lead iodide ((PEA)2(MA)[Pb2I7]) hybrid perovskite exists as temperature-dependent dimorphs exhibiting an ill-defined phase transition occurring over 150 - 200 K range. Raman scattering,...

Photo-oxidative degradation of methylammonium lead iodide perovskite: mechanism and protection

2019 ◽  
Vol 7 (5) ◽  
pp. 2275-2282 ◽  
Author(s):  
Yixin Ouyang ◽  
Yajuan Li ◽  
Pengchen Zhu ◽  
Qiang Li ◽  
Yuan Gao ◽  
...  
Keyword(s):  
Degradation Mechanism ◽  
Oxidative Degradation ◽  
Lead Iodide ◽  
Amine Modification ◽  
Methylammonium Lead Iodide

A new three-step photo-oxidative degradation mechanism of MAPbI3 is proposed. A strategy for protecting MAPbI3 by 2-(4-fluorophenyl)propan-2-amine modification is designed.

scholarly journals Atmospheric OH reactivity in central London: observations, model predictions and estimates of in situ ozone production

2015 ◽  
Vol 15 (21) ◽  
pp. 31247-31286
Author(s):  
L. K. Whalley ◽  
D. Stone ◽  
B. Bandy ◽  
R. Dunmore ◽  
J. F. Hamilton ◽  
...  
Keyword(s):  
Degradation Mechanism ◽  
Oxidation Products ◽  
Chemical Mechanism ◽  
Ozone Production ◽  
Two Dimensional ◽  
Diurnal Profile ◽  
Biogenic Compounds ◽  
Master Chemical Mechanism ◽  
The Difference

Abstract. Near-continuous measurements of OH reactivity in the urban background atmosphere of central London during the summer of 2012 are presented. OH reactivity behaviour is seen to be broadly dependent on airmass origin with the highest reactivity and the most pronounced diurnal profile observed when air had passed over central London to the East, prior to measurement. Averaged over the entire observation period of 26 days, OH reactivity peaked at ~ 27 s−1 in the morning with a minimum of ~ 15 s−1 during the afternoon. A maximum OH reactivity of 116 s−1 was recorded on one day during morning rush hour. A detailed box model using the Master Chemical Mechanism was used to calculate OH reactivity, and was constrained with an extended measurement dataset of volatile organic compounds (VOCs) derived from GC-FID and a two-dimensional GC instrument which included heavier molecular weight (up to C12) aliphatic VOCs, oxygenated VOCs and the biogenic VOCs of α pinene and limonene. Comparison was made between observed OH reactivity and modelled OH reactivity using (i) a standard suite of VOC measurements (C2-C8 hydrocarbons and a small selection of oxygenated VOCs) and (ii) a more comprehensive inventory including species up to C12. Modelled reactivities were lower than those measured (by 33 %) when only the reactivity of the standard VOC suite was considered. The difference between measured and modelled reactivity was improved, to within 15 %, if the reactivity of the higher VOCs (≥ C9) was also considered, with the reactivity of the biogenic compounds of α pinene and limonene and their oxidation products almost entirely responsible for this improvement. Further improvements in the model's ability to reproduce OH reactivity (to within 6 %) could be achieved if the reactivity and degradation mechanism of unassigned two-dimensional GC peaks were estimated. Neglecting the contribution of the higher VOCs (≥ C9) (particularly α pinene and limonene) and model-generated intermediates worsened the agreement between modelled and observed OH concentrations (by 41 %) and the magnitude of in situ ozone production calculated from the production of RO2 was significantly lower (60 %). This work highlights that any future ozone abatement strategies should consider the role that biogenic emissions play alongside anthropogenic emissions in influencing London's air quality.

scholarly journals Improved Photovoltaic Efficiency and Amplified Photocurrent Generation in Mesoporous n = 1 Two-Dimensional Lead–Iodide Perovskite Solar Cells

2019 ◽  
Vol 31 (3) ◽  
pp. 890-898 ◽  
Author(s):  
Benny Febriansyah ◽  
Teck Ming Koh ◽  
Yulia Lekina ◽  
Nur Fadilah Jamaludin ◽  
Annalisa Bruno ◽  
...  
Keyword(s):  
Solar Cells ◽  
Perovskite Solar Cells ◽  
Two Dimensional ◽  
Lead Iodide ◽  
Photovoltaic Efficiency ◽  
Photocurrent Generation

scholarly journals Manipulating efficient light emission in two-dimensional perovskite crystals by pressure-induced anisotropic deformation

2019 ◽  
Vol 5 (7) ◽  
pp. eaav9445 ◽  
Author(s):  
Sheng Liu ◽  
Shishuai Sun ◽  
Chee Kwan Gan ◽  
Andrés Granados del Águila ◽  
Yanan Fang ◽  
...  
Keyword(s):  
Structural Changes ◽  
Light Emission ◽  
Driving Forces ◽  
Quantum Confinement Effect ◽  
Visible Spectrum ◽  
Structural Deformation ◽  
Moderate Pressure ◽  
Two Dimensional ◽  
New Paradigm ◽  
Lead Iodide

The hybrid nature and soft lattice of organolead halide perovskites render their structural changes and optical properties susceptible to external driving forces such as temperature and pressure, remarkably different from conventional semiconductors. Here, we investigate the pressure-induced optical response of a typical two-dimensional perovskite crystal, phenylethylamine lead iodide. At a moderate pressure within 3.5 GPa, its photoluminescence red-shifts continuously, exhibiting an ultrabroad energy tunability range up to 320 meV in the visible spectrum, with quantum yield remaining nearly constant. First-principles calculations suggest that an out-of-plane quasi-uniaxial compression occurs under a hydrostatic pressure, while the energy is absorbed by the reversible and elastic tilting of the benzene rings within the long-chain ligands. This anisotropic structural deformation effectively modulates the quantum confinement effect by 250 meV via barrier height lowering. The broad tunability within a relatively low pressure range will expand optoelectronic applications to a new paradigm with pressure as a tuning knob.

scholarly journals Two-Dimensional Dion–Jacobson Hybrid Lead Iodide Perovskites with Aromatic Diammonium Cations

2019 ◽  
Vol 141 (32) ◽  
pp. 12880-12890 ◽  
Author(s):  
Xiaotong Li ◽  
Weijun Ke ◽  
Boubacar Traoré ◽  
Peijun Guo ◽  
Ido Hadar ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Lead Iodide

Stable two-dimensional lead iodide hybrid materials for light detection and broadband photoluminescence

2021 ◽  
Author(s):  
Mohamed Saber Lassoued ◽  
Yuan-Chao Pang ◽  
Qian-Wen Li ◽  
Xinkai Ding ◽  
Bo Jiao ◽  
...  
Keyword(s):  
Hybrid Materials ◽  
Two Dimensional ◽  
Photocurrent Response ◽  
Lead Iodide ◽  
Light Detection ◽  
Inorganic Hybrid ◽  
Hybrid Compounds ◽  
Broadband Emission

We report here two new semiconducting two-dimensional lead iodide organic–inorganic hybrid compounds with broadband emission and strong photocurrent response.

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