scholarly journals High-Pressure Study of Perovskite-Like Organometal Halide: Band-Gap Narrowing and Structural Evolution of [NH3-(CH2)4-NH3]CuCl4

2017 ◽  
Vol 8 (2) ◽  
pp. 500-506 ◽  
Author(s):  
Qian Li ◽  
Shourui Li ◽  
Kai Wang ◽  
Zewei Quan ◽  
Yue Meng ◽  
...  
Keyword(s):  
High Pressure ◽  
Band Gap ◽  
Structural Evolution ◽  
Band Gap Narrowing ◽  
High Pressure Study

Hydrogen-bond enhancement triggered structural evolution and band gap engineering of hybrid perovskite (C6H5CH2NH3)2PbI4 under high pressure

2020 ◽  
Vol 22 (4) ◽  
pp. 1841-1846 ◽  
Author(s):  
Can Tian ◽  
Yongfu Liang ◽  
Wuhao Chen ◽  
Yanping Huang ◽  
Xiaoli Huang ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
High Pressure ◽  
Band Gap ◽  
Structural Evolution ◽  
Optoelectronic Properties ◽  
Band Gap Engineering ◽  
Hybrid Perovskite

Hybrid organic–inorganic perovskites (HOIPs) have gained substantial attention due to their excellent photovoltaic and optoelectronic properties.

scholarly journals Large Band Gap Narrowing and Prolonged Carrier Lifetime of (C 4 H 9 NH 3 ) 2 PbI 4 under High Pressure

2019 ◽  
pp. 1900240 ◽  
Author(s):  
Ye Yuan ◽  
Xiao‐Fei Liu ◽  
Xuedan Ma ◽  
Xiaoli Wang ◽  
Xin Li ◽  
...  
Keyword(s):  
High Pressure ◽  
Band Gap ◽  
Carrier Lifetime ◽  
Band Gap Narrowing

scholarly journals Origin of pressure-induced band gap tuning in tin halide perovskites

2020 ◽  
Vol 1 (8) ◽  
pp. 2840-2845
Author(s):  
Mauro Coduri ◽  
Thomas B. Shiell ◽  
Timothy A. Strobel ◽  
Arup Mahata ◽  
Federico Cova ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Band Gap ◽  
Orthorhombic Phase ◽  
Blue Shift ◽  
Red Shift ◽  
Pressure Increase ◽  
Halide Perovskites ◽  
Band Gap Tuning ◽  
High Pressure Study

Structural and optical high-pressure study of FASnBr3 revealed a cubic to orthorhombic phase transition near 1.4 GPa accompanied by a huge band gap red-shift from 2.4 to 1.6 eV, which is followed by a blue-shift of ∼0.2 eV upon further pressure increase.

scholarly journals Crystal and electronic structure engineering of tin monoxide by external pressure

2021 ◽  
Author(s):  
Kun Li ◽  
Junjie Wang ◽  
Vladislav A. Blatov ◽  
Yutong Gong ◽  
Naoto Umezawa ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Band Gap ◽  
High Pressures ◽  
Low Pressure ◽  
Widespread Application ◽  
Space Group ◽  
Tin Monoxide ◽  
High Possibility ◽  
Pressure Phase

AbstractAlthough tin monoxide (SnO) is an interesting compound due to its p-type conductivity, a widespread application of SnO has been limited by its narrow band gap of 0.7 eV. In this work, we theoretically investigate the structural and electronic properties of several SnO phases under high pressures through employing van der Waals (vdW) functionals. Our calculations reveal that a metastable SnO (β-SnO), which possesses space group P21/c and a wide band gap of 1.9 eV, is more stable than α-SnO at pressures higher than 80 GPa. Moreover, a stable (space group P2/c) and a metastable (space group Pnma) phases of SnO appear at pressures higher than 120 GPa. Energy and topological analyses show that P2/c-SnO has a high possibility to directly transform to β-SnO at around 120 GPa. Our work also reveals that β-SnO is a necessary intermediate state between high-pressure phase Pnma-SnO and low-pressure phase α-SnO for the phase transition path Pnma-SnO →β-SnO → α-SnO. Two phase transition analyses indicate that there is a high possibility to synthesize β-SnO under high-pressure conditions and have it remain stable under normal pressure. Finally, our study reveals that the conductive property of β-SnO can be engineered in a low-pressure range (0–9 GPa) through a semiconductor-to-metal transition, while maintaining transparency in the visible light range.

High Pressure Studies of Quantum Well Emission and Deep Emission in GaInP(ordered)-GaAs Heterostructures

1997 ◽  
Vol 499 ◽  
Author(s):  
S. H. Kwok ◽  
P. Y. Yu ◽  
K. Uchida ◽  
T. Arai
Keyword(s):  
High Pressure ◽  
Quantum Well ◽  
Emission Band ◽  
Excitation Power ◽  
High Excitation ◽  
High Pressure Studies ◽  
Band Alignments ◽  
High Pressure Study

ABSTRACTWe report on a high pressure study of emission from a series of GaInP(ordered)/GaAs heterostructures. A so-called “deep emission” band at 1.46 eV is observed in all our samples. At high excitation power, quantum well emission emerges in only one structure where thin GaP layers are inserted on both sides of the GaAs well. From the pressure dependent emission in this sample we have determined its band alignments. The role of the GaP layers in suppressing the deep emission is elucidated.

High-Pressure Study of Metallocenes, M(η5-C5H5)2(M = Fe, Co)

2007 ◽  
Vol 76 (Suppl.A) ◽  
pp. 31-32
Author(s):  
Sergey V. Ovsyannikov ◽  
Vladimir V. Shchennikov ◽  
Alexander N. Titov ◽  
Yoshiya Uwatoko
Keyword(s):  
High Pressure ◽  
High Pressure Study

In-situ high-pressure study of the ordered phase of ethyl propionate

2007 ◽  
Vol 63 (1) ◽  
pp. 111-117 ◽  
Author(s):  
Roman Gajda ◽  
Andrzej Katrusiak
Keyword(s):  
High Pressure ◽  
Degrees Of Freedom ◽  
Molecular Volume ◽  
Ethyl Propionate ◽  
Intermolecular Contacts ◽  
High Pressure Study ◽  
Pressure Phase ◽  
Three Degrees Of Freedom ◽  
Volume Difference

Ethyl propionate, C5H10O2 (m.p. 199 K), has been in-situ pressure-frozen and its structure determined at 1.34, 1.98 and 2.45 GPa. The crystal structure of the new high-pressure phase (denoted β) is different from phase α obtained by lowering the temperature. The freezing pressure of ethyl propionate at 296 K is 1.03 GPa. The molecule assumes an extended chain s-trans–trans–trans conformation, only slightly distorted from planarity. The closest intermolecular contacts in both phases are formed between carbonyl O and methyl H atoms; however, the ethyl-group H atoms in phase β form no contacts shorter than 2.58 Å. A considerable molecular volume difference of 24.2 Å3 between phases α and β can be rationalized in terms of degrees of freedom of molecules arranged into closely packed structures: the three degrees of freedom allowed for rearrangements of molecules confined to planar sheets in phase α, but are not sufficient for obtaining a densely packed pattern.

High-Pressure Study of the Anomalous Rare-Earth TernariesEu1.2Mo6S8andEu1.2Mo6Se8

1981 ◽  
Vol 46 (4) ◽  
pp. 276-279 ◽  
Author(s):  
C. W. Chu ◽  
S. Z. Huang ◽  
C. H. Lin ◽  
R. L. Meng ◽  
M. K. Wu ◽  
...  
Keyword(s):  
High Pressure ◽  
Rare Earth ◽  
High Pressure Study
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