scholarly journals Mechanism of Pressure-Induced Phase Transitions, Amorphization, and Absorption-Edge Shift in Photovoltaic Methylammonium Lead Iodide

2016 ◽  
Vol 7 (17) ◽  
pp. 3458-3466 ◽  
Author(s):  
Marek Szafrański ◽  
Andrzej Katrusiak
Keyword(s):  
Phase Transitions ◽  
Absorption Edge ◽  
Lead Iodide ◽  
Absorption Edge Shift ◽  
Methylammonium Lead Iodide

scholarly journals Neutron powder diffraction study of the phase transitions in deuterated methylammonium lead iodide

2022 ◽  
Author(s):  
Jiaxun Liu ◽  
Juan Du ◽  
Anthony E Phillips ◽  
Peter B Wyatt ◽  
David A Keen ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Diffraction Study ◽  
Powder Diffraction ◽  
Landau Theory ◽  
Orthorhombic Phase ◽  
Neutron Powder Diffraction ◽  
Temperature Phase ◽  
Lead Iodide ◽  
Lower Temperature ◽  
Methylammonium Lead Iodide

Abstract We report the results of a neutron powder diffraction study of the phase transitions in deuterated methylammonium lead iodide, with a focus on the system of orientational distortions of the framework of PbI6 octahedra. The results are analysed in terms of symmetry-adapted lattice strains and normal mode distortions. The higher-temperature cubic–tetragonal phase transition at 327 K is weakly discontinuous and nearly tricritical. The variations of rotation angles and spontaneous strains with temperature are consistent with a standard Landau theory treatment. The lower-temperature transition to the orthorhombic phase at 165 K is discontinuous, with two systems of octahedral rotations and internal distortions that together can be described by five order parameters of different symmetry. In this paper we quantify the various symmetry breaking distortions and their variation with temperature, together with their relationship to the spontaneous strains, within the formalism of Landau theory. A number of curious results in the low-temperature phase are identified, particularly regarding distortion amplitudes that decrease rather than increase with lowering temperature.

scholarly journals Pressure-Induced Phase Transitions and Bandgap-Tuning Effect of Methylammonium Lead Iodide Perovskite

MRS Advances ◽  
2018 ◽  
Vol 3 (32) ◽  
pp. 1825-1830 ◽  
Author(s):  
Shaojie Jiang ◽  
Yanan Fang ◽  
Ruipeng Li ◽  
Timothy J. White ◽  
Zhongwu Wang ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Ambient Pressure ◽  
Applied Pressure ◽  
Original Structure ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
Lead Iodide ◽  
Methylammonium Lead Iodide ◽  
Peak Pressures ◽  
Bandgap Tuning

ABSTRACTPressure-induced crystallographic transitions and optical behavior of MAPbI3 (MA=methylammonium) were investigated using in-situ synchrotron X-ray diffraction and laser-excited photoluminescence spectroscopy. We observed that the tetragonal phase that presents under ambient pressure transformed to a ReO3-type cubic phase at 0.3 GPa, which further converted into a putative orthorhombic structure at 2.7 GPa. The sample was finally separated into crystalline and amorphous fractions beyond 4.7 GPa. During the decompression, the phase-mixed material restored the original structure in two distinct pathways depending on the peak pressures. Being monitored using a laser-excited photoluminescence technique under each applied pressure, it was determined that the bandgap reduced with an increase of the pressure till 0.3 GPa and then enlarged with an increase of the pressure up to 2.7 GPa. This work lays the foundation for understanding pressure-induced phase transitions and bandgap tuning of MAPbI3, enriching potentially the toolkit for engineering perovskites related photovoltaic devices.

Properties of methylammonium lead iodide peerovskite single crystals

2017 ◽  
Vol 58 (8) ◽  
Author(s):  
E. S. Yudanova ◽  
◽  
T. A. Duda ◽  
O. E. Tereshchenko ◽  
O. I. Semenova ◽  
...  
Keyword(s):  
Single Crystals ◽  
Lead Iodide ◽  
Methylammonium Lead Iodide

Ferroelectric domains in methylammonium lead iodide perovskite solar cells

2018 ◽  
Author(s):  
Holger Röhm ◽  
Tobias Leonhard ◽  
Michael J. Hoffmann ◽  
Alexander Colsmann
Keyword(s):  
Solar Cells ◽  
Perovskite Solar Cells ◽  
Lead Iodide ◽  
Ferroelectric Domains ◽  
Methylammonium Lead Iodide

The impact of metal ions doping on the defect chemistry of methylammonium lead iodide

2018 ◽  
Author(s):  
Nga Phung ◽  
Antonio Abate ◽  
Daniele Meggiolaro ◽  
Filippo De Angelis ◽  
Roberto Felix Duarte ◽  
...  
Keyword(s):  
Metal Ions ◽  
Defect Chemistry ◽  
Lead Iodide ◽  
Methylammonium Lead Iodide ◽  
The Impact

Guanidinium/Methylammonium Lead Iodide Perovskite: An Unexplored Avenue for Stable and 20% Efficient Solar Cells

2018 ◽  
Author(s):  
Gustavo de Miguel ◽  
Alexander Davis Jodlowski ◽  
Cristina Roldán-Carmona ◽  
Luis Camacho Delgado ◽  
Mohammad Khaja Nazeeruddin
Keyword(s):  
Solar Cells ◽  
Lead Iodide ◽  
Methylammonium Lead Iodide

scholarly journals MAPbI3 Microrods-Based Photo Resistor Switches: Fabrication and Electrical Characterization

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4385
Author(s):  
Ehsan Raza ◽  
Fakhra Aziz ◽  
Arti Mishra ◽  
Noora Jabor Al-Thani ◽  
Zubair Ahmad
Keyword(s):  
Carrier Transport ◽  
Solution Process ◽  
Electrical Characterization ◽  
Lead Iodide ◽  
Voltage Range ◽  
Conduction Mechanisms ◽  
Voltage Dependent ◽  
Conduction Behavior ◽  
Temperature Solution ◽  
Methylammonium Lead Iodide

The current work proposed the application of methylammonium lead iodide (MAPbI3) perovskite microrods toward photo resistor switches. A metal-semiconductor-metal (MSM) configuration with a structure of silver-MAPbI3(rods)-silver (Ag/MAPbI3/Ag) based photo-resistor was fabricated. The MAPbI3 microrods were prepared by adopting a facile low-temperature solution process, and then an independent MAPbI3 microrod was employed to the two-terminal device. The morphological and elemental compositional studies of the fabricated MAPbI3 microrods were performed using FESEM and EDS, respectively. The voltage-dependent electrical behavior and electronic conduction mechanisms of the fabricated photo-resistors were studied using current–voltage (I–V) characteristics. Different conduction mechanisms were observed at different voltage ranges in dark and under illumination. In dark conditions, the conduction behavior was dominated by typical trap-controlled charge transport mechanisms within the investigated voltage range. However, under illumination, the carrier transport is dominated by the current photogenerated mechanism. This study could extend the promising application of perovskite microrods in photo-induced resistor switches and beyond.

scholarly journals Common Phase and Structure Misidentifications in High-Resolution TEM Characterization of Perovskite Materials

2020 ◽  
Vol 6 (1) ◽  
pp. 1
Author(s):  
Yu-Hao Deng
Keyword(s):  
High Resolution ◽  
Research Field ◽  
Structure Characterization ◽  
Phase Identification ◽  
Lead Iodide ◽  
Perovskite Materials ◽  
High Resolution Tem ◽  
Methylammonium Lead Iodide ◽  
Dose Imaging

High-resolution TEM (HRTEM) is a powerful tool for structure characterization. However, methylammonium lead iodide (MAPbI3) perovskite is highly sensitive to electron beams and easily decomposes into lead iodide (PbI2). Misidentifications, such as PbI2 being incorrectly labeled as perovskite, are widely present in HRTEM characterization and would negatively affect the development of perovskite research field. Here misidentifications in MAPbI3 perovskite are summarized, classified, and corrected based on low-dose imaging and electron diffraction (ED) simulations. Corresponding crystallographic parameters of intrinsic tetragonal MAPbI3 and the confusable hexagonal PbI2 are presented unambiguously. Finally, the method of proper phase identification and some strategies to control the radiation damage in HRTEM are provided. This warning paves the way to avoid future misinterpretations in HRTEM characterization of perovskite and other electron beam-sensitive materials.

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