scholarly journals Role of mid-gap states in charge transport and photoconductivity in semiconductor nanocrystal films

2011 ◽  
Vol 2 (1) ◽  
Author(s):  
Prashant Nagpal ◽  
Victor I. Klimov
Keyword(s):  
Charge Transport ◽  
Semiconductor Nanocrystal ◽  
Nanocrystal Films ◽  
Gap States

Intra- and inter-nanocrystal charge transport in nanocrystal films

Nanoscale ◽  
2018 ◽  
Vol 10 (17) ◽  
pp. 8042-8057 ◽  
Author(s):  
Willi Aigner ◽  
Oliver Bienek ◽  
Bruno P. Falcão ◽  
Safwan U. Ahmed ◽  
Hartmut Wiggers ◽  
...  
Keyword(s):  
Charge Transport ◽  
Semiconductor Nanocrystal ◽  
Nanocrystal Films ◽  
Optoelectronic Applications

The exploitation of semiconductor nanocrystal (NC) films in novel electronic and optoelectronic applications requires a better understanding of charge transport in these systems.

Chemical Availability of Bromide Dictates CsPbBr3 Nanocrystal Growth

2019 ◽  
Author(s):  
Je-Ruei Wen ◽  
Benjamin Roman ◽  
Freddy Rodriguez Ortiz ◽  
Noel Mireles Villegas ◽  
Nicholas Porcellino ◽  
...  
Keyword(s):  
Reaction Time ◽  
Growth Mechanism ◽  
Chemical Control ◽  
Critical Role ◽  
Phase Evolution ◽  
Detailed Understanding ◽  
Semiconductor Nanocrystal ◽  
Nanocrystal Growth ◽  
Chemical Availability

Lack of detailed understanding of the growth mechanism of CsPbBr3 nanocrystals has hindered sophisticated morphological and chemical control of this important emerging optoelectronic material. Here, we have elucidated the growth mechanism by slowing the reaction kinetics. When 1-bromohexane is used as an alternative halide source, bromide is slowly released into the reaction mixture, extending the reaction time from ~3 seconds to greater than 20 minutes. This enables us to monitor the phase evolution of products over the course of reaction, revealing that CsBr is the initial species formed, followed by Cs4PbBr6, and finally CsPbBr3. Further, formation of monodisperse CsBr nanocrystals is demonstrated in a bromide-deficient and lead-abundant solution. The CsBr can only be transformed into CsPbBr3 nanocubes if additional bromide is added. Our results indicate a fundamentally different growth mechanism for CsPbBr3 in comparison with more established semiconductor nanocrystal systems and reveal the critical role of the chemical availability of bromide for the growth reactions.<br>

scholarly journals Mechanical and Charge Transport Properties of Alkanethiol Self-Assembled Monolayers on a Au(111) Surface:  The Role of Molecular Tilt

Langmuir ◽  
2008 ◽  
Vol 24 (5) ◽  
pp. 2219-2223 ◽  
Author(s):  
Yabing Qi ◽  
Imma Ratera ◽  
Jeong Y. Park ◽  
Paul D. Ashby ◽  
Su Ying Quek ◽  
...  
Keyword(s):  
Charge Transport ◽  
Transport Properties ◽  
Self Assembled Monolayers ◽  
Assembled Monolayers ◽  
Self Assembled

The Maxwell-Wagner model for charge transport in ambipolar organic field-effect transistors: The role of zero-potential position

2012 ◽  
Vol 101 (24) ◽  
pp. 243302 ◽  
Author(s):  
Yasuhiro Mashiko ◽  
Dai Taguchi ◽  
Martin Weis ◽  
Takaaki Manaka ◽  
Mitsumasa Iwamoto
Keyword(s):  
Charge Transport ◽  
Field Effect ◽  
Field Effect Transistors ◽  
Organic Field Effect Transistors ◽  
Wagner Model ◽  
Zero Potential

Nanoconfining solution-processed organic semiconductors for emerging optoelectronics

2021 ◽  
Author(s):  
Yuze Zhang ◽  
Alina Chen ◽  
Min-Woo Kim ◽  
Aida Alaei ◽  
Stephanie S. Lee
Keyword(s):  
Charge Transport ◽  
Organic Semiconductors ◽  
Organic Semiconductor ◽  
Light Emission ◽  
Solution Processed ◽  
Semiconductor Crystals

This tutorial review highlights the role of nanoconfinement in selecting for orientations and polymorphs of organic semiconductor crystals that are optimized for optoelectronic processes, including charge transport and light emission.

Conductive Probe Microscopy Investigation of Electrical and Charge Transport in Advanced Carbon Nanotubes and Nanofibers-Polymer Nanocomposites

2014 ◽  
pp. 343-375
Author(s):  
Tewfik Souier
Keyword(s):  
Carbon Nanotubes ◽  
Charge Transport ◽  
Electrostatic Force ◽  
Three Dimensional ◽  
Current Sensing ◽  
Probe Microscopy ◽  
Force Microscopy ◽  
Three Dimensional Representation ◽  
Microscopy Investigation

In this chapter, the main scanning probe microscopy-based methods to measure the transport properties in advanced polymer-Carbon Nanotubes (CNT) nanocomposites are presented. The two major approaches to investigate the electrical and charge transport (i.e., Electrostatic Force Microscopy [EFM] and Current-Sensing Atomic Force Microscopy [CS-AFM]) are illustrated, starting from their basic principles. First, the authors show how the EFM-related techniques can be used to provide, at high spatial resolution, a three-dimensional representation CNT networks underneath the surface. This allows the studying of the role of nanoscopic features such as CNTs, CNT-CNT direct contact, and polymer-CNT junctions in determining the overall composite properties. Complementary, CS-AFM can bring insight into the transport mechanism by imaging the spatial distribution of currents percolation paths within the nanocomposite. Finally, the authors show how the CS-AFM can be used to quantify the surface/bulk percolation probability and the nanoscopic electrical conductivity, which allows one to predict the macroscopic percolation model.

scholarly journals Composite formation in CdSe:Cu2Se nanocrystal films, charge transport characteristics and heterojunction performance

RSC Advances ◽  
2020 ◽  
Vol 10 (15) ◽  
pp. 8842-8852 ◽  
Author(s):  
N. Sajid Babu ◽  
M. Abdul Khadar
Keyword(s):  
Charge Transport ◽  
Composite Formation ◽  
Nanocrystal Films

The use of nanocrystals as materials for potential technological applications depends on tailoring their properties through intentional doping with external impurities.

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