scholarly journals Temperature-dependent studies of exciton binding energy and phase-transition suppression in (Cs,FA,MA)Pb(I,Br)3 perovskites

APL Materials ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 031113 ◽  
Author(s):  
Fabian Ruf ◽  
Meltem F. Aygüler ◽  
Nadja Giesbrecht ◽  
Bettina Rendenbach ◽  
Alice Magin ◽  
...  
Keyword(s):  
Phase Transition ◽  
Binding Energy ◽  
Exciton Binding Energy ◽  
Temperature Dependent

Impact of excess PbI2 on the structure and the temperature dependent optical properties of methylammonium lead iodide perovskites

2018 ◽  
Vol 6 (28) ◽  
pp. 7512-7519 ◽  
Author(s):  
Tobias Meier ◽  
Tanaji P. Gujar ◽  
Andreas Schönleber ◽  
Selina Olthof ◽  
Klaus Meerholz ◽  
...  
Keyword(s):  
Thin Films ◽  
Phase Transition ◽  
Optical Properties ◽  
Electronic Structure ◽  
Binding Energy ◽  
Direct Impact ◽  
Lead Iodide ◽  
Temperature Dependent ◽  
Methylammonium Lead Iodide ◽  
Transition Behaviour

Excess PbI2 in MAPbI3 thin films has no direct impact on the electronic structure but changes the temperature dependence of the exciton binding energy and the phase transition behaviour.

Temperature-Dependent Electroabsorption Spectra and Exciton Binding Energy in a Perovskite CH3NH3PbI3 Nanocrystalline Film

2020 ◽  
Vol 3 (12) ◽  
pp. 11830-11840
Author(s):  
Morihiko Hamada ◽  
Shailesh Rana ◽  
Efat Jokar ◽  
Kamlesh Awasthi ◽  
Eric Wei-Guang Diau ◽  
...  
Keyword(s):  
Binding Energy ◽  
Exciton Binding Energy ◽  
Nanocrystalline Film ◽  
Temperature Dependent

Temperature-Dependent Electroabsorption and Electrophotoluminescence and Exciton Binding Energy in MAPbBr3 Perovskite Quantum Dots

2019 ◽  
Vol 123 (32) ◽  
pp. 19927-19937 ◽  
Author(s):  
Shailesh Rana ◽  
Kamlesh Awasthi ◽  
Sumit S. Bhosale ◽  
Eric Wei-Guang Diau ◽  
Nobuhiro Ohta
Keyword(s):  
Quantum Dots ◽  
Binding Energy ◽  
Exciton Binding Energy ◽  
Temperature Dependent ◽  
Perovskite Quantum Dots

Phonon modes, dielectric constants, and exciton mass parameters in ternary MgxZn1−xO

2006 ◽  
Vol 928 ◽  
Author(s):  
Carsten Bundesmann ◽  
Michael Lorenz ◽  
Marius Grundmann ◽  
Mathias Schubert
Keyword(s):  
Phase Transition ◽  
Binding Energy ◽  
Coordination Number ◽  
Hexagonal Wurtzite Structure ◽  
Binding Energies ◽  
Dielectric Constants ◽  
Exciton Binding Energy ◽  
Phonon Modes ◽  
Raman Scattering Spectroscopy ◽  
Rocksalt Structure

ABSTRACTThe long-wavelength optical phonons and dielectric constants of PLD-grown MgxZn1−xO films are studied by combination of infrared spectroscopic ellipsometry and Raman scattering spectroscopy. The ternary alloy MgxZn1−xO exhibits a phase transition with change of coordination number from four-fold coordinated, hexagonal wurtzite structure (ZnO) to six-fold coordinated, cubic rocksalt structure (MgO). It is found that both phonon mode frequencies and dielectric constants change abruptly upon phase transition, which is assigned to the change of coordination number. The change of dielectric constants can be related to the change of electronic properties, for instance, the exciton binding energy. In a simple approach, the exciton binding energy depends on the reduced exciton mass and the static dielectric constant. By comparison with experimental values of the exciton binding energies it is found that the reduced exciton mass must increase by a factor of about two upon face transition from wurtzite to rocksalt structure.

Temperature-Dependent Solid-state Luminescence and Reversible Phase Transition of (n-Bu4N)[Au(SC6H3-3,5-Me2)2]

2003 ◽  
Vol 32 (11) ◽  
pp. 1002-1003 ◽  
Author(s):  
Seiji Watase ◽  
Takayuki Kitamura ◽  
Nobuko Kanehisa ◽  
Masami Nakamoto ◽  
Yasushi Kai ◽  
...  
Keyword(s):  
Phase Transition ◽  
Solid State ◽  
Temperature Dependent ◽  
Reversible Phase Transition ◽  
Reversible Phase ◽  
State Luminescence

Observations and calculations of the exciton binding energy in (In,Ga)As/GaAs strained-quantum-well heterostructures

1990 ◽  
Vol 41 (2) ◽  
pp. 1090-1094 ◽  
Author(s):  
Karen J. Moore ◽  
Geoffrey Duggan ◽  
Karl Woodbridge ◽  
Christine Roberts
Keyword(s):  
Binding Energy ◽  
Quantum Well ◽  
Exciton Binding Energy ◽  
Strained Quantum Well

scholarly journals Temperature Dependence of Electrical Properties and Crystal Structure of 0.29Pb(In1/2Nb1/2)O3–0.44Pb(Mg1/3Nb2/3)O3–0.27PbTiO3Single Crystals

2013 ◽  
Vol 2013 ◽  
pp. 1-5
Author(s):  
Qian Li ◽  
Yun Liu ◽  
Andrew Studer ◽  
Zhenrong Li ◽  
Ray Withers ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Phase Transition ◽  
Electrical Properties ◽  
Dielectric Permittivity ◽  
Neutron Diffraction ◽  
Electrical Measurement ◽  
Temperature Dependent ◽  
Electromechanical Properties ◽  
Polar Order

We characterized the temperature dependent (~25–200°C) electromechanical properties and crystal structure of Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3single crystals usingin situelectrical measurement and neutron diffraction techniques. The results show that the poled crystal experiences an addition phase transition around 120°C whereas such a transition is absent in the unpoled crystal. It is also found that the polar order persists above the maximum dielectric permittivity temperature at which the crystal shows a well-defined antiferroelectric behavior. The changes in the electrical properties and underlying crystal structure are discussed in the paper.

The variational approach to the Glashow–Weinberg–Salam model

1987 ◽  
Vol 65 (4) ◽  
pp. 395-402 ◽  
Author(s):  
R. Manka ◽  
J. Sladkowski
Keyword(s):  
Phase Transition ◽  
Effective Potential ◽  
Variational Approach ◽  
Canonical Quantization ◽  
Temperature Dependent ◽  
Model Based

The variational approach to the Glashow–Weinberg–Salam model, based on canonical quantization, is presented. It is shown that taking into consideration the Becchi–Rouet–Stora symmetry leads to the correct, temperature-dependent, effective potential. This generalization of the Weinberg–Coleman potential leads to a phase transition of the first kind.

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