1.
Leonardo D. Machado Cristiano F. Woellner, Pedro A. S. Autreto
The Influence of Morphology on the Charge Transport in Two-Phase Disordered Organic Systems Journal Article
Em: Mater. Res. Soc. Symp. Proc., vol. 1737, 2015.
@article{Woellner2015,
title = {The Influence of Morphology on the Charge Transport in Two-Phase Disordered Organic Systems},
author = {Cristiano F. Woellner, Leonardo D. Machado, Pedro A. S. Autreto, Jose A. Freire, Douglas S. Galvao},
url = {http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=9707375&fulltextType=RA&fileId=S1946427415005023},
doi = {10.1557/opl.2015.502},
year = {2015},
date = {2015-05-22},
journal = {Mater. Res. Soc. Symp. Proc.},
volume = {1737},
abstract = {In this work we use a three-dimensional Pauli master equation to investigate the charge carrier mobility of a two-phase system, which can mimic donor-acceptor and amorphous- crystalline bulk heterojunctions. Our approach can be separated into two parts: the morphology generation and the charge transport modeling in the generated blend. The morphology part is based on a Monte Carlo simulation of binary mixtures (donor/acceptor). The second part is carried out by numerically solving the steady-state Pauli master equation. By taking the energetic disorder of each phase, their energy offset and domain morphology into consideration, we show that the carrier mobility can have a significant different behavior when compared to a one-phase system. When the energy offset is non-zero, we show that the mobility electric field dependence switches from negative to positive at a threshold field proportional to the energy offset. Additionally, the influence of morphology, through the domain size and the interfacial roughness parameters, on the transport was also investigated.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In this work we use a three-dimensional Pauli master equation to investigate the charge carrier mobility of a two-phase system, which can mimic donor-acceptor and amorphous- crystalline bulk heterojunctions. Our approach can be separated into two parts: the morphology generation and the charge transport modeling in the generated blend. The morphology part is based on a Monte Carlo simulation of binary mixtures (donor/acceptor). The second part is carried out by numerically solving the steady-state Pauli master equation. By taking the energetic disorder of each phase, their energy offset and domain morphology into consideration, we show that the carrier mobility can have a significant different behavior when compared to a one-phase system. When the energy offset is non-zero, we show that the mobility electric field dependence switches from negative to positive at a threshold field proportional to the energy offset. Additionally, the influence of morphology, through the domain size and the interfacial roughness parameters, on the transport was also investigated.
2.
Maureen J Lagos Pedro A Autreto, Daniel Ugarte
Correlation between Quantum Conductance and Atomic Arrangement of Silver Atomic-Size Nanocontacts Conferência
Correlation between Quantum Conductance and Atomic Arrangement of Silver Atomic-Size Nanocontacts, não D1.3, MRSSpring 2012, 2012.
@conference{2012MRSSpring-D,
title = {Correlation between Quantum Conductance and Atomic Arrangement of Silver Atomic-Size Nanocontacts},
author = {Pedro A Autreto, Maureen J Lagos, Daniel Ugarte, Douglas S Galvao.},
url = {http://www.mrs.org/s12-program-d/
https://sites.ifi.unicamp.br/autretos/files/2015/04/2012MRSSpringMeeting-D-Program-Symposium-D-Nanocontacts–Emerging-Materials-and-Processing-for-Ohmicity-and-Rectification-2012-MRS-Spring-Meeting.pdf},
year = {2012},
date = {2012-04-10},
booktitle = {Correlation between Quantum Conductance and Atomic Arrangement of Silver Atomic-Size Nanocontacts},
number = {D1.3},
publisher = {MRSSpring 2012},
abstract = {The intense work of the nanotechnology community has increased the capabilities of researchers to produce new materials at the nanometric scale. As a result, novel physical and chemical behaviors are frequently reported opening opportunities for creating new kind of devices. These new devices will require a precise knowledge of the physical properties of atomic-size contacts and nanowires (NW)/interconnects. The generation of these atomic-size metal wires by the mechanical stretching has allowed the study of a wide range of metals at nanoscale. Due to the dominant role of surface energy in this size regime, several anomalous wire structures have already been reported to form during the stretching of very tiny wires, as hollow tubular metals and the size-limit to the existence of defects in NWs [1-3]. In this work we have studied the relevance of thermal effects on the structural and transport response of Ag atomic-size nanowires generated by mechanical elongation. Our study involve time-resolved atomic resolution transmission electron microscopy imaging and quantum conductance measurement using a ultra-high-vacuum mechanically he controllable break junction in association with quantum transport calculations. We have observed drastic changes in conductance and structural properties of Ag nanowires generated at different temperatures (150 and 300 K). By combining electron microscopy images, electronic transport measurements and theoretical modeling we have been able to establish a consistent correlation between the conductance and structural properties of Ag NWs. In particular, our study has revealed the formation of metastable rectangular rod-like Ag wire (3/3) along [001] direction. [1] M. J. Lagos, F. Sato, J. Bettini, V. Rodrigues, D. S. Galvao and D. Ugarte, Nature Nanotechnology v4, 149 (2009) [2] P. A. S. Autreto, M. J. Lagos, F. Sato, J. Bettini, V. Rodrigues, D. Ugarte, and D. S. Galvao, Phys. Rev. Lett. v106, 065501 (2011). [3] M. J. Lagos, F. Sato, D. S. Galvão, and D. Ugarte, Phys. Rev. Lett. v106, 055501 (2011).},
keywords = {},
pubstate = {published},
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The intense work of the nanotechnology community has increased the capabilities of researchers to produce new materials at the nanometric scale. As a result, novel physical and chemical behaviors are frequently reported opening opportunities for creating new kind of devices. These new devices will require a precise knowledge of the physical properties of atomic-size contacts and nanowires (NW)/interconnects. The generation of these atomic-size metal wires by the mechanical stretching has allowed the study of a wide range of metals at nanoscale. Due to the dominant role of surface energy in this size regime, several anomalous wire structures have already been reported to form during the stretching of very tiny wires, as hollow tubular metals and the size-limit to the existence of defects in NWs [1-3]. In this work we have studied the relevance of thermal effects on the structural and transport response of Ag atomic-size nanowires generated by mechanical elongation. Our study involve time-resolved atomic resolution transmission electron microscopy imaging and quantum conductance measurement using a ultra-high-vacuum mechanically he controllable break junction in association with quantum transport calculations. We have observed drastic changes in conductance and structural properties of Ag nanowires generated at different temperatures (150 and 300 K). By combining electron microscopy images, electronic transport measurements and theoretical modeling we have been able to establish a consistent correlation between the conductance and structural properties of Ag NWs. In particular, our study has revealed the formation of metastable rectangular rod-like Ag wire (3/3) along [001] direction. [1] M. J. Lagos, F. Sato, J. Bettini, V. Rodrigues, D. S. Galvao and D. Ugarte, Nature Nanotechnology v4, 149 (2009) [2] P. A. S. Autreto, M. J. Lagos, F. Sato, J. Bettini, V. Rodrigues, D. Ugarte, and D. S. Galvao, Phys. Rev. Lett. v106, 065501 (2011). [3] M. J. Lagos, F. Sato, D. S. Galvão, and D. Ugarte, Phys. Rev. Lett. v106, 055501 (2011).
3.
Autreto, Pedro A
Correlation between Quantum Conductance and Atomic Arrangement of Silver Atomic-Size Nanocontacts Apresentação
10.04.2012, (Work with Maureen J Lagos, Daniel Ugarte, Douglas S Galvao.).
@misc{2012MRSSpring-D-talking,
title = {Correlation between Quantum Conductance and Atomic Arrangement of Silver Atomic-Size Nanocontacts},
author = {Pedro A Autreto},
url = {http://www.mrs.org/s12-program-d/
https://sites.ifi.unicamp.br/autretos/files/2015/04/2012MRSSpringMeeting-D-Program-Symposium-D-Nanocontacts–Emerging-Materials-and-Processing-for-Ohmicity-and-Rectification-2012-MRS-Spring-Meeting.pdf},
year = {2012},
date = {2012-04-10},
booktitle = {Correlation between Quantum Conductance and Atomic Arrangement of Silver Atomic-Size Nanocontacts},
number = {D1.3},
publisher = {MRSSpring 2012},
abstract = {The intense work of the nanotechnology community has increased the capabilities of researchers to produce new materials at the nanometric scale. As a result, novel physical and chemical behaviors are frequently reported opening opportunities for creating new kind of devices. These new devices will require a precise knowledge of the physical properties of atomic-size contacts and nanowires (NW)/interconnects. The generation of these atomic-size metal wires by the mechanical stretching has allowed the study of a wide range of metals at nanoscale. Due to the dominant role of surface energy in this size regime, several anomalous wire structures have already been reported to form during the stretching of very tiny wires, as hollow tubular metals and the size-limit to the existence of defects in NWs [1-3]. In this work we have studied the relevance of thermal effects on the structural and transport response of Ag atomic-size nanowires generated by mechanical elongation. Our study involve time-resolved atomic resolution transmission electron microscopy imaging and quantum conductance measurement using a ultra-high-vacuum mechanically he controllable break junction in association with quantum transport calculations. We have observed drastic changes in conductance and structural properties of Ag nanowires generated at different temperatures (150 and 300 K). By combining electron microscopy images, electronic transport measurements and theoretical modeling we have been able to establish a consistent correlation between the conductance and structural properties of Ag NWs. In particular, our study has revealed the formation of metastable rectangular rod-like Ag wire (3/3) along [001] direction. [1] M. J. Lagos, F. Sato, J. Bettini, V. Rodrigues, D. S. Galvao and D. Ugarte, Nature Nanotechnology v4, 149 (2009) [2] P. A. S. Autreto, M. J. Lagos, F. Sato, J. Bettini, V. Rodrigues, D. Ugarte, and D. S. Galvao, Phys. Rev. Lett. v106, 065501 (2011). [3] M. J. Lagos, F. Sato, D. S. Galvão, and D. Ugarte, Phys. Rev. Lett. v106, 055501 (2011).},
note = {Work with Maureen J Lagos, Daniel Ugarte, Douglas S Galvao.},
keywords = {},
pubstate = {published},
tppubtype = {presentation}
}
The intense work of the nanotechnology community has increased the capabilities of researchers to produce new materials at the nanometric scale. As a result, novel physical and chemical behaviors are frequently reported opening opportunities for creating new kind of devices. These new devices will require a precise knowledge of the physical properties of atomic-size contacts and nanowires (NW)/interconnects. The generation of these atomic-size metal wires by the mechanical stretching has allowed the study of a wide range of metals at nanoscale. Due to the dominant role of surface energy in this size regime, several anomalous wire structures have already been reported to form during the stretching of very tiny wires, as hollow tubular metals and the size-limit to the existence of defects in NWs [1-3]. In this work we have studied the relevance of thermal effects on the structural and transport response of Ag atomic-size nanowires generated by mechanical elongation. Our study involve time-resolved atomic resolution transmission electron microscopy imaging and quantum conductance measurement using a ultra-high-vacuum mechanically he controllable break junction in association with quantum transport calculations. We have observed drastic changes in conductance and structural properties of Ag nanowires generated at different temperatures (150 and 300 K). By combining electron microscopy images, electronic transport measurements and theoretical modeling we have been able to establish a consistent correlation between the conductance and structural properties of Ag NWs. In particular, our study has revealed the formation of metastable rectangular rod-like Ag wire (3/3) along [001] direction. [1] M. J. Lagos, F. Sato, J. Bettini, V. Rodrigues, D. S. Galvao and D. Ugarte, Nature Nanotechnology v4, 149 (2009) [2] P. A. S. Autreto, M. J. Lagos, F. Sato, J. Bettini, V. Rodrigues, D. Ugarte, and D. S. Galvao, Phys. Rev. Lett. v106, 065501 (2011). [3] M. J. Lagos, F. Sato, D. S. Galvão, and D. Ugarte, Phys. Rev. Lett. v106, 055501 (2011).
2015
1.
Leonardo D. Machado Cristiano F. Woellner, Pedro A. S. Autreto
The Influence of Morphology on the Charge Transport in Two-Phase Disordered Organic Systems Journal Article
Em: Mater. Res. Soc. Symp. Proc., vol. 1737, 2015.
Resumo | Links | BibTeX | Tags: ab initio, conductance, nanowires
@article{Woellner2015,
title = {The Influence of Morphology on the Charge Transport in Two-Phase Disordered Organic Systems},
author = {Cristiano F. Woellner, Leonardo D. Machado, Pedro A. S. Autreto, Jose A. Freire, Douglas S. Galvao},
url = {http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=9707375&fulltextType=RA&fileId=S1946427415005023},
doi = {10.1557/opl.2015.502},
year = {2015},
date = {2015-05-22},
journal = {Mater. Res. Soc. Symp. Proc.},
volume = {1737},
abstract = {In this work we use a three-dimensional Pauli master equation to investigate the charge carrier mobility of a two-phase system, which can mimic donor-acceptor and amorphous- crystalline bulk heterojunctions. Our approach can be separated into two parts: the morphology generation and the charge transport modeling in the generated blend. The morphology part is based on a Monte Carlo simulation of binary mixtures (donor/acceptor). The second part is carried out by numerically solving the steady-state Pauli master equation. By taking the energetic disorder of each phase, their energy offset and domain morphology into consideration, we show that the carrier mobility can have a significant different behavior when compared to a one-phase system. When the energy offset is non-zero, we show that the mobility electric field dependence switches from negative to positive at a threshold field proportional to the energy offset. Additionally, the influence of morphology, through the domain size and the interfacial roughness parameters, on the transport was also investigated.},
keywords = {ab initio, conductance, nanowires},
pubstate = {published},
tppubtype = {article}
}
In this work we use a three-dimensional Pauli master equation to investigate the charge carrier mobility of a two-phase system, which can mimic donor-acceptor and amorphous- crystalline bulk heterojunctions. Our approach can be separated into two parts: the morphology generation and the charge transport modeling in the generated blend. The morphology part is based on a Monte Carlo simulation of binary mixtures (donor/acceptor). The second part is carried out by numerically solving the steady-state Pauli master equation. By taking the energetic disorder of each phase, their energy offset and domain morphology into consideration, we show that the carrier mobility can have a significant different behavior when compared to a one-phase system. When the energy offset is non-zero, we show that the mobility electric field dependence switches from negative to positive at a threshold field proportional to the energy offset. Additionally, the influence of morphology, through the domain size and the interfacial roughness parameters, on the transport was also investigated.
