scholarly journals Photogeneration and Mobility of Charge Carriers in Atomically Thin Colloidal InSe Nanosheets Probed by Ultrafast Terahertz Spectroscopy

2016 ◽  
Vol 7 (20) ◽  
pp. 4191-4196 ◽  
Author(s):  
Jannika Lauth ◽  
Aditya Kulkarni ◽  
Frank C. M. Spoor ◽  
Nicolas Renaud ◽  
Ferdinand C. Grozema ◽  
...  
Keyword(s):  
Terahertz Spectroscopy ◽  
Charge Carriers ◽  
Mobility Of Charge Carriers

scholarly journals Elucidating the role of disorder and free-carrier recombination kinetics in CH3NH3PbI3 perovskite films

2015 ◽  
Vol 6 (1) ◽  
Author(s):  
Chan La-o-vorakiat ◽  
Teddy Salim ◽  
Jeannette Kadro ◽  
Mai-Thu Khuc ◽  
Reinhard Haselsberger ◽  
...  
Keyword(s):  
Low Temperatures ◽  
Terahertz Spectroscopy ◽  
Free Carrier ◽  
Charge Carriers ◽  
Time Resolved ◽  
Broadband Absorption ◽  
Carrier Recombination ◽  
Mobility Of Charge Carriers ◽  
Three Body ◽  
Body Recombination

Abstract Apart from broadband absorption of solar radiation, the performance of photovoltaic devices is governed by the density and mobility of photogenerated charge carriers. The latter parameters indicate how many free carriers move away from their origin, and how fast, before loss mechanisms such as carrier recombination occur. However, only lower bounds of these parameters are usually obtained. Here we independently determine both density and mobility of charge carriers in a perovskite film by the use of time-resolved terahertz spectroscopy. Our data reveal the modification of the free carrier response by strong backscattering expected from these heavily disordered perovskite films. The results for different phases and different temperatures show a change of kinetics from two-body recombination at room temperature to three-body recombination at low temperatures. Our results suggest that perovskite-based solar cells can perform well even at low temperatures as long as the three-body recombination has not become predominant.

A Comprehensive Insight Towards Pharmaceutical Aspects of Graphene Nanosheets

2020 ◽  
Vol 21 (11) ◽  
pp. 1016-1027 ◽  
Author(s):  
Fatemeh Emadi ◽  
Arash Emadi ◽  
Ahmad Gholami
Keyword(s):  
Targeted Delivery ◽  
Graphene Nanosheets ◽  
High Surface ◽  
High Surface Area ◽  
Charge Carriers ◽  
Pharmaceutical Sciences ◽  
Pharmacokinetics And Pharmacodynamics ◽  
Mobility Of Charge Carriers ◽  
Graphene Derivatives ◽  
Pharmacokinetic Properties

Graphene Derivatives (GDs) have captured the interest and imagination of pharmaceutical scientists. This review exclusively provides pharmacokinetics and pharmacodynamics information with a particular focus on biopharmaceuticals. GDs can be used as multipurpose pharmaceutical delivery systems due to their ultra-high surface area, flexibility, and fast mobility of charge carriers. Improved effects, targeted delivery to tissues, controlled release profiles, visualization of biodistribution and clearance, and overcoming drug resistance are examples of the benefits of GDs. This review focuses on the application of GDs for the delivery of biopharmaceuticals. Also, the pharmacokinetic properties and the advantage of using GDs in pharmaceutics will be reviewed to achieve a comprehensive understanding about the GDs in pharmaceutical sciences.

Frequency dependent mobility of charge carriers along polymer chains with finite length

2005 ◽  
Vol 243 (2) ◽  
pp. 382-386 ◽  
Author(s):  
P. Prins ◽  
F. C. Grozema ◽  
J. M. Schins ◽  
L. D. A. Siebbeles
Keyword(s):  
Finite Length ◽  
Charge Carriers ◽  
Polymer Chains ◽  
Frequency Dependent ◽  
Mobility Of Charge Carriers

scholarly journals Термоэлектрические свойства твердых растворов (CuInSe-=SUB=-2-=/SUB=-)-=SUB=-1-x-=/SUB=-(In-=SUB=-2-=/SUB=-Te-=SUB=-3-=/SUB=-)-=SUB=-x-=/SUB=-

2022 ◽  
Vol 56 (1) ◽  
pp. 38
Author(s):  
Ч.И. Абилов ◽  
М.Ш. Гасанова ◽  
Н.Т. Гусейнова ◽  
Э.К. Касумова
Keyword(s):  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Solid Solutions ◽  
Figure Of Merit ◽  
Charge Carriers ◽  
Thermoelectric Figure Of Merit ◽  
Thermoelectric Figure ◽  
Mobility Of Charge Carriers ◽  
Temperature Dependences ◽  
Thermoelectric Coefficient

The results of studying the temperature dependences of electrical conductivity, thermoelectric coefficient, Hall mobility of charge carriers, total and electronic thermal conductivity, as well as phonon thermal resistance of alloys of (CuInSe2)1-x(In2Te3)x solid solutions at x=0.005 and 0.0075 are presented. The values ​​of these parameters for certain temperatures were used to calculate the values ​​of the thermoelectric figure of merit of the indicated compositions. It turned out that as the temperature rises, the thermoelectric figure of merit tends to grow strongly, from which it can be concluded that these materials can be used in the manufacture of thermoelements.

Properties of Bi and BiSb Nano-Dimensional Layers in Thz Frequency Range

2020 ◽  
Vol 312 ◽  
pp. 206-212
Author(s):  
Ivan L. Tkhorzhevskiy ◽  
Anton D. Zaitsev ◽  
Petr S. Demchenko ◽  
Dmitry V. Zykov ◽  
Aleksei V. Asach ◽  
...  
Keyword(s):  
Phase Shift ◽  
Time Domain ◽  
Terahertz Wave ◽  
Film Structure ◽  
Charge Carriers ◽  
Frequency Range ◽  
Terahertz Time Domain Spectroscopy ◽  
Antimony Content ◽  
Mobility Of Charge Carriers ◽  
Substrate Film

In the present paper we demonstrate and compare different properties of Bi and Bi1-xSbx thin films placed on polyimide (PI) substrate in frequency range from 0.2 to 1.0 THz. Bi films with a thickness of 40, 105 and 150 nm have been studied as well as 150 nm Bi1-xSbx solid solutions with Sb concentration of 5, 8, 12 and 15 %. An effective refractive index and permittivity of whole substrate/film structures have been derived by using terahertz time-domain spectroscopy (THz-TDS) method. These measurements have shown the positive phase shift in PI substrate with a thickness of 42 μm and revealed that it is barely transparent in studied frequency range, but the whole substrate/film structure provides the negative phase shift of terahertz wave. It was shown that the permittivity depends on mobility of charge carriers which is driven by film thickness and antimony content.

Strain-engineering the in-plane electrical anisotropy of GeSe monolayers

2020 ◽  
Vol 22 (2) ◽  
pp. 914-918 ◽  
Author(s):  
Zongbao Li ◽  
Xinsheng Liu ◽  
Xia Wang ◽  
Yusi Yang ◽  
Shun-Chang Liu ◽  
...  
Keyword(s):  
Effective Mass ◽  
Strain Engineering ◽  
Charge Carriers ◽  
Electrical Anisotropy ◽  
Mobility Of Charge Carriers

The anisotropic ratio of the effective mass and mobility of charge carriers of GeSe monolayer along two principle axes can be controlled by using simple strain conditions.

Identification of frequency regimes for short and long range mobility of charge carriers in GO/MnFe2O4/PPy nanocomposites

2020 ◽  
Vol 263 ◽  
pp. 116336 ◽  
Author(s):  
Amna Riaz ◽  
Qurat ul Ain ◽  
Farah Kanwal ◽  
Saira Ishaq ◽  
Ali Raza Khan ◽  
...  
Keyword(s):  
Long Range ◽  
Charge Carriers ◽  
Mobility Of Charge Carriers

scholarly journals Mobility of charge carriers in self-assembled monolayers

2019 ◽  
Vol 10 ◽  
pp. 2449-2458
Author(s):  
Zhihua Fu ◽  
Tatjana Ladnorg ◽  
Hartmut Gliemann ◽  
Alexander Welle ◽  
Asif Bashir ◽  
...  
Keyword(s):  
Charge Transport ◽  
Charge Carrier Mobility ◽  
Charge Carriers ◽  
Self Assembled Monolayers ◽  
Force Microscopy ◽  
Atomic Force ◽  
Mobility Of Charge Carriers ◽  
Assembled Monolayers ◽  
Self Assembled

We present a new approach to study charge transport within 2D layers of organic semi-conductors (OSCs) using atomic force microscopy (AFM)-based lithography applied to self-assembled monolayers (SAMs), fabricated from appropriate organothiols. The extent of lateral charge transport was investigated by insulating pre-defined patches within OSC-based SAMs with regions of insulating SAM made from large band gap alkanethiolates. The new method is demonstrated using a phenyl-linked anthracenethiolate (PAT), 4-(anthracene-2-ylethynyl)benzyl thiolate. I–V characteristics of differently shaped PAT-islands were measured using the AFM tip as a top electrode. We were able to determine a relationship between island size and electrical conductivity, and from this dependence, we could obtain information on the lateral charge transport and charge carrier mobility within the thin OSC layers. Our study demonstrates that AFM nanografting of appropriately functionalized OSC molecules provides a suitable method to determine intrinsic mobilities of charge carriers in OSC thin films. In particular, this method is rather insensitive with regard to influence of grain boundaries and other defects, which hamper the application of conventional methods for the determination of mobilities in macroscopic samples.

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