Charge Transport Properties of a Partially Reduced V2O5 Xerogel Intercalated with a Polymer Electrolyte

1995 ◽  
Vol 393 ◽  
Author(s):  
Joyce Albritton Thomas ◽  
Grant M. Kloster ◽  
D. Shriver ◽  
C. R. Kannewurf
Keyword(s):  
Charge Transport ◽  
Transport Properties ◽  
Polymer Electrolyte ◽  
Variable Temperature ◽  
Sol Gel ◽  
Electronic Conductivity ◽  
Charge Carriers ◽  
Electronic Charge ◽  
Ionic Charge ◽  
Intimate Contact

ABSTRACTRecently, there has been considerable interest in advanced materials and processing techniques for practical applications. V2O5 xerogels have generated much attention because they are layered materials that undergo reversible redox intercalation with lithium. The sol-gel process has been used to intercalate V2O5 xerogels with the polymer electrolyte, oxymethylene linked poly(ethylene oxide) - lithium triflate [(a-PEO)n(LiCF3SO3)]. The resulting nanocomposite is a mixed ionic-electronic conductor in which the ionic charge carriers in the polymer electrolyte are in intimate contact with the electronic charge carriers in the V205 xerogel. Variable-temperature electronic conductivity and thermoelectric power measurements have been performed to examine the charge transport properties.

scholarly journals Deciphering the effect of traps on electronic charge transport properties of methylammonium lead tribromide perovskite

2020 ◽  
Vol 6 (37) ◽  
pp. eabb6393
Author(s):  
Artem Musiienko ◽  
Jindřich Pipek ◽  
Petr Praus ◽  
Mykola Brynza ◽  
Eduard Belas ◽  
...  
Keyword(s):  
Monte Carlo Simulation ◽  
Charge Transport ◽  
Transport Properties ◽  
Critical Role ◽  
Charge Carriers ◽  
Electronic Charge ◽  
Free Charge ◽  
Optoelectronic Materials ◽  
Halide Perovskites

Halide perovskites have undergone remarkable developments as highly efficient optoelectronic materials for a variety of applications. Several studies indicated the critical role of defects on the performance of perovskite devices. However, the parameters of defects and their interplay with free charge carriers remain unclear. In this study, we explored the dynamics of free holes in methylammonium lead tribromide (MAPbBr3) single crystals using the time-of-flight (ToF) current spectroscopy. By combining ToF spectroscopy and Monte Carlo simulation, three energy states were detected in the bandgap of MAPbBr3. In addition, we found the trapping and detrapping rates of free holes ranging from a few microseconds to hundreds of microseconds. Contrary to previous studies, we revealed a strong detrapping activity of traps. We showed that these traps substantially affect the transport properties of MAPbBr3, including mobility and mobility-lifetime product. Our results provide an insight on charge transport properties of perovskite semiconductors.

scholarly journals Electronic conductivity of polymer electrolytes: electronic charge transport properties of LiTFSI-doped PEO

2020 ◽  
Vol 22 (15) ◽  
pp. 7680-7684 ◽  
Author(s):  
Mikael Unge ◽  
Harish Gudla ◽  
Chao Zhang ◽  
Daniel Brandell
Keyword(s):  
Charge Transport ◽  
Transport Properties ◽  
Band Gap ◽  
First Principles ◽  
Polymer Electrolytes ◽  
Electronic Conductivity ◽  
Electronic Conduction ◽  
Electronic Charge

Electronic conduction in polymer electrolytes in batteries will be of importance when it is made very thin. We calculate electronic charge transport properties from first principles, e.g. it is shown that the band gap of PEO with LiTFSI can reduce to 0.6 eV.

scholarly journals Electrochemical and Electronic Charge Transport Properties of Ni-Doped LiMn2O4 Spinel Obtained from Polyol-Mediated Synthesis

Materials ◽  
2018 ◽  
Vol 11 (5) ◽  
pp. 806 ◽  
Author(s):  
Shuo Yang ◽  
Dirk Schmidt ◽  
Abhishek Khetan ◽  
Felix Schrader ◽  
Simon Jakobi ◽  
...  
Keyword(s):  
Charge Transport ◽  
Transport Properties ◽  
Electronic Charge ◽  
Limn2o4 Spinel

Self-dissociation and protonic charge transport in water and

1958 ◽  
Vol 247 (1251) ◽  
pp. 505-533 ◽  
Keyword(s):  
Aqueous Solutions ◽  
Charge Transport ◽  
Proton Transport ◽  
Reaction Rates ◽  
Transport Processes ◽  
Electronic Charge ◽  
Kinetic Properties ◽  
Theoretical Treatment ◽  
Relaxation Techniques ◽  
Ionic Charge

A comprehensive survey on experimental techniques, results and theoretical interpretations concerning the self-dissociation and protonic charge transport in water and ice is given. Recent investigations of fast protolytic reactions in pure water and aqueous solutions by means of relaxation techniques complete our knowledge about state and kinetic properties of the proton in this medium. In comparison here with our experience regarding the same properties in ice crystals are far less complete, as usual techniques of aqueous solutions are not applicable. Direct measurements of individual properties of ‘excess’ and ‘defect’ protons in ice (mobilities, concentrations, reaction rates) are presented. The proton transport in hydrogen-bonded media is completely different from normal ionic migration and corresponds more to electronic transport processes in semi-conductors. Generally the proton transport through hydrogen bonds includes two processes: (1) The formation (or rearrangement) of (H-bond) structure with orientation, favourable for a proton transition, and (2) the charge transfer within the H bond. The first step is rate determining in water, whereas the second one is decisive for the charge transport in ice. The requirements for a theoretical treatment therefore are (1) for water: a theory of ‘structural diffusion’ of the H-bonded hydration complex of H 3 O + , and (2) for ice: a (quantum-mechanical) theory of the protonic motion within the potential well of the H bond. The mechanism of structural diffusion provides an explanation of the anomalous H 3 O + and OH - mobility and their recombination rate in water. The difference between protonic and normal ionic charge transport occurs most obviously in the absolute values of mobilities in ice. The proton mobility in ice differs by many orders of magnitude from that of normal ions, but only by a factor of about 50 from electronic mobilities in some metals and semi-conductors. Further arguments, demonstrating the analogy between protonic and electronic charge transport are given. The reaction kinetics of protolytic systems and the fast proton transport in H-bonded systems are of certain importance with respect to biological problems.

Comparison of Ionic Diffusion in Sol-Gel Derived Micron and Nano LiTaO3

2011 ◽  
Vol 312-315 ◽  
pp. 1222-1227
Author(s):  
Norlida Kamarulzaman ◽  
Lili Widarti Zainudin ◽  
Rihanum Yahaya Subban ◽  
Zurina Osman
Keyword(s):  
Sol Gel ◽  
Lithium Ion ◽  
Charge Carriers ◽  
Ac Impedance Spectroscopy ◽  
Spectroscopy Technique ◽  
Ionic Charge ◽  
Charged Species ◽  
Wide Range ◽  
Solid State Batteries ◽  
Impedance Spectroscopy Technique

LiTaO3 is an important optical material. It may also be possible to use this material as a solid electrolyte for lithium-ion batteries which may be applicable in thin film solid-state batteries. Generally, ceramics have a wide range of impedances. Many ceramics have mixed charged species consisting of electronic as well as ionic charge carriers. This work investigates the conductivity of LiTaO3 materials using ac impedance spectroscopy technique measured as a function of temperature.

Electrical Conductivity of Ionic and Electronic Mixture

2001 ◽  
Vol 699 ◽  
Author(s):  
Gyeong Man Choi ◽  
Joon Hee Kim ◽  
Young Min Park
Keyword(s):  
Electrical Conductivity ◽  
Single Phase ◽  
Electronic Conductivity ◽  
Charge Carriers ◽  
Electronic Charge ◽  
Total Conductivity ◽  
Mixed Conductivity ◽  
Emf Measurements ◽  
Wide Range ◽  
Mixed Ionic Electronic Conductors

AbstractMixed ionic-electronic conductors (MIECs) which have both ionic and electronic species as charge carriers have a wide range of applications, such as electrodes in fuel cells, electrocatalytic reactors, and gas separating membranes. They may have either electronic or ionic species as the majority charge carriers. In addition to the single-phase mixed conductors, they may be fabricated by mixing two different phases of materials. Although these composites have been less studied than the single phase MIECs, the combined properties are often superior to single phase MIECs, and properties not seen in an individual phase may appear in the composite phase.YSZ-based composite systems were chosen to test the effect of transition-metal-oxide (TMO) addition on the electronic conductivity of composite. To induce mixed conductivity, electronic-conducting TMOs such as NiO and Mn2O3 were added into YSZ above the solubility limit. While the solid solubility of NiO in YSZ is limited that of Mn2O3 is large.In this work, mixed conducting yttria (8 mol%) stabilized zirconia (YSZ) - TMO composites were prepared in full composition range and the electrical conductivity of the composites was measured by 4-probe d.c. conductivity. Electromotive force (emf) measurements of the galvanic cell, current-voltage (I-V) measurements in ion blocking condition and the oxygen-partial-pressure dependent conductivity have been used to determine the contribution of the ionic and electronic charge carriers on the conductivity. Thus the composition-dependent electrical properties were used to explain the percolation behavior of electronic charge carriers in ionic matrix.Although the total conductivity of dense YSZ-TMO composite was variable with TMO content, the partial-electronic conductivity increased and the ionic conductivity decreased. The composition-dependent conductivity was discussed.

Relation Between Local Structure, Electric Dipole and Charge Carrier Dynamics in DHICA Melanin, a Model for Biocompatible Semiconductors

2019 ◽  
Author(s):  
Micaela Matta ◽  
Alessandro Pezzella ◽  
Alessandro Troisi
Keyword(s):  
Electronic Structure ◽  
Degrees Of Freedom ◽  
Structural Model ◽  
Computational Study ◽  
Oxidative Polymerization ◽  
Radical Scavenging ◽  
Charge Carriers ◽  
Electronic Charge ◽  
Polymer Semiconductors ◽  
Synthetic Pigments

<div><div><div><p>Eumelanins are a family of natural and synthetic pigments obtained by oxidative polymerization of their natural precursors: 5,6 dihydroxyindole and its 2-carboxy derivative (DHICA). The simultaneous presence of ionic and electronic charge carriers makes these pigments promising materials for applications in bioelectronics. In this computational study we build a structural model of DHICA melanin considering the interplay between its many degrees of freedom, then we examine the electronic structure of representative oligomers. We find that a non-vanishing dipole along the polymer chain sets this system apart from conventional polymer semiconductors, determining its electronic structure, reactivity toward oxidation and localization of the charge carriers. Our work sheds light on previously unnoticed features of DHICA melanin that not only fit well with its radical scavenging and photoprotective properties, but open new perspectives towards understanding and tuning charge transport in this class of materials.<br></p></div></div></div>

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