scholarly journals Optical and Electrical Transport Evaluations of n-Type Iron Pyrite Single Crystals

ACS Omega ◽  
2021 ◽  
Author(s):  
Shunsuke Uchiyama ◽  
Ryosuke Sato ◽  
Ryoji Katsube ◽  
Muhammad Monirul Islam ◽  
Hideaki Adachi ◽  
...  
Keyword(s):  
Single Crystals ◽  
Electrical Transport ◽  
Iron Pyrite

Ionization of High-Density Deep Donor Defect States Explains the Low Photovoltage of Iron Pyrite Single Crystals

2014 ◽  
Vol 136 (49) ◽  
pp. 17163-17179 ◽  
Author(s):  
Miguel Cabán-Acevedo ◽  
Nicholas S. Kaiser ◽  
Caroline R. English ◽  
Dong Liang ◽  
Blaise J. Thompson ◽  
...  
Keyword(s):  
Single Crystals ◽  
High Density ◽  
Iron Pyrite ◽  
Defect States ◽  
Deep Donor ◽  
Donor Defect

A study on the effects of mixed organic cations on the structure and properties in lead halide perovskites

2020 ◽  
Vol 22 (5) ◽  
pp. 3105-3111 ◽  
Author(s):  
Chao Wu ◽  
Daoyou Guo ◽  
Peigang Li ◽  
Shunli Wang ◽  
Aiping Liu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Single Crystals ◽  
Electrical Transport ◽  
Organic Cation ◽  
Organic Cations ◽  
Structure And Properties ◽  
Electrical Transport Properties ◽  
Halide Perovskites ◽  
A Site ◽  
Lead Halide

Four types of organic cation-mixed single crystals were successfully synthesized by partially substituting A site cations to investigate the effect of organic cations on structure, optical features, thermal stability, and electrical transport properties.

Synthesis and electrical transport properties of Bi2O2Se single crystals

2018 ◽  
Vol 498 ◽  
pp. 244-247 ◽  
Author(s):  
Qianhui Mao ◽  
Xiaodong Geng ◽  
Jinfeng Yang ◽  
Junji Zhang ◽  
Shuangmei Zhu ◽  
...  
Keyword(s):  
Transport Properties ◽  
Single Crystals ◽  
Electrical Transport ◽  
Electrical Transport Properties

Electrical Transport Properties of the Pentatelluride Materials Hfte5 and Zrte5

1997 ◽  
Vol 478 ◽  
Author(s):  
T. M. Tritt ◽  
M. L. Wilson ◽  
R. L. Littleton ◽  
C. Feger ◽  
J. Kolis ◽  
...  
Keyword(s):  
Single Crystal ◽  
Single Crystals ◽  
Electrical Transport ◽  
Entire Range ◽  
Room Temperature ◽  
Polycrystalline Material ◽  
Polycrystalline Materials ◽  
Electrical Transport Properties ◽  
Low Dimensional ◽  
P Type

AbstractWe have measured the resistivity and thermopower of single crystals as well as polycrystalline pressed powders of the low-dimensional pentatelluride materials: HfTe5 and ZrTe5. We have performed these measurements as a function of temperature between 5K and 320K. In the single crystals there is a peak in the resistivity for both materials at a peak temperature, Tp where Tp ≈ 80K for HfTe5 and Tp ≈ 145K for ZrTe5. Both materials exhibit a large p-type thermopower around room temperature which undergoes a change to n-type below the peak. This data is similar to behavior observed previously in these materials. We have also synthesized pressed powders of polycrystalline pentatelluride materials, HfTe5 and ZrTe5. We have measured the resistivity and thermopower of these polycrystalline materials as a function of temperature between 5K and 320K. For the polycrystalline material, the room temperature thermopower for each of these materials is relatively high, +95 μV/K and +65 μV/K for HfTe5 and ZrTe5 respectively. These values compare closely to thermopower values for single crystals of these materials. At 77 K, the thermopower is +55 μV/K for HfTe5 and +35 μV/K for ZrTe5. In fact, the thermopower for the polycrystals decreases monotonically with temperature to T ≈ 5K, thus exhibiting p-type behavior over the entire range of temperature. As expected, the resistivity for the polycrystals is higher than the single crystal material, with values of 430 mΩ-cm and 24 mΩ-cm for Hfre5 and ZrTe5 respectively, compared to single crystal values of 0.35 mΩ-cm (HfTe5) and 1.0 mΩ-cm (ZrTe5). We have found that the peak in the resistivity evident in both single crystal materials is absent in these polycrystalline materials. We will discuss these materials in relation to their potential as candidates for thermoelectric applications.

scholarly journals Anderson localization of electrons in single crystals: LixFe7Se8

2016 ◽  
Vol 2 (2) ◽  
pp. e1501283 ◽  
Author(s):  
Tianping Ying ◽  
Yueqiang Gu ◽  
Xiao Chen ◽  
Xinbo Wang ◽  
Shifeng Jin ◽  
...  
Keyword(s):  
Fermi Level ◽  
Single Crystals ◽  
Electrical Transport ◽  
Three Dimensional ◽  
Electronic States ◽  
Coulomb Repulsion ◽  
Experimental Investigations ◽  
Crystalline Materials ◽  
Lattice Disorder ◽  
Anderson Insulators

Anderson (disorder-induced) localization, proposed more than half a century ago, has inspired numerous efforts to explore the absence of wave diffusions in disordered media. However, the proposed disorder-induced metal-insulator transition (MIT), associated with the nonpropagative electron waves, has hardly been observed in three-dimensional (3D) crystalline materials, let alone single crystals. We report the observation of an MIT in centimeter-size single crystals of LixFe7Se8induced by lattice disorder. Both specific heat and infrared reflectance measurements reveal the presence of considerable electronic states in the vicinity of the Fermi level when the MIT occurs, suggesting that the transition is not due to Coulomb repulsion mechanism. The 3D variable range hopping regime evidenced by electrical transport measurements at low temperatures indicates the localized nature of the electronic states on the Fermi level. Quantitative analyses of carrier concentration, carrier mobility, and simulated density of states (DOS) fully support that LixFe7Se8is an Anderson insulator. On the basis of these results, we provide a unified DOS picture to explain all the experimental results, and a schematic diagram for finding other potential Anderson insulators. This material will thus serve as a rich playground for both theoretical and experimental investigations on MITs and disorder-induced phenomena.

Low temperature electrical transport properties of RuO2 and IrO2 single crystals

2004 ◽  
Vol 16 (45) ◽  
pp. 8035-8041 ◽  
Author(s):  
J J Lin ◽  
S M Huang ◽  
Y H Lin ◽  
T C Lee ◽  
H Liu ◽  
...  
Keyword(s):  
Low Temperature ◽  
Transport Properties ◽  
Single Crystals ◽  
Electrical Transport ◽  
Electrical Transport Properties
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