1
|
Jacobs M, Krumland J, Valencia AM, Cocchi C. Pulse-Induced Dynamics of a Charge-Transfer Complex from First Principles. J Phys Chem A 2023; 127:8794-8805. [PMID: 37824697 PMCID: PMC10614200 DOI: 10.1021/acs.jpca.3c03709] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Revised: 08/18/2023] [Indexed: 10/14/2023]
Abstract
The ultrafast dynamics of charge carriers in organic donor-acceptor interfaces are of primary importance to understanding the fundamental properties of these systems. In this work, we focus on a charge-transfer complex formed by quaterthiophene p-doped by tetrafluoro-tetracyanoquinodimethane and investigate electron dynamics and vibronic interactions also at finite temperatures by applying a femtosecond pulse in resonance with the two lowest energy excitations of the system with perpendicular and parallel polarization with respect to the interface. The adopted ab initio formalism based on real-time time-dependent density-functional theory coupled to Ehrenfest dynamics enables monitoring the dynamical charge transfer across the interface and assessing the role played by the nuclear motion. Our results show that the strong intermolecular interactions binding the complex already in the ground state influence the dynamics, too. The analysis of the nuclear motion involved in these processes reveals the participation of different vibrational modes depending on the electronic states stimulated by the resonant pulse. Coupled donor-acceptor modes mostly influence the excited state polarized across the interface, while intramolecular vibrations in the donor molecule dominate the excitation in the orthogonal direction. The results obtained at finite temperatures are overall consistent with this picture, although thermal disorder contributes to slightly decreasing interfacial charge transfer.
Collapse
Affiliation(s)
- Matheus Jacobs
- Physics
Department and IRIS Adlershof, Humboldt-Universität
zu Berlin, Berlin 12489, Germany
| | - Jannis Krumland
- Physics
Department and IRIS Adlershof, Humboldt-Universität
zu Berlin, Berlin 12489, Germany
| | - Ana M. Valencia
- Physics
Department and IRIS Adlershof, Humboldt-Universität
zu Berlin, Berlin 12489, Germany
- Institute
of Physics, Carl von Ossietzky Universität Oldenburg, 26129 Oldenburg, Germany
| | - Caterina Cocchi
- Physics
Department and IRIS Adlershof, Humboldt-Universität
zu Berlin, Berlin 12489, Germany
- Institute
of Physics, Carl von Ossietzky Universität Oldenburg, 26129 Oldenburg, Germany
- Center
for Nanoscale Dynamics (CeNaD), Carl von
Ossietzky Universität, Oldenburg 26129, Germany
| |
Collapse
|
2
|
Wang P, Fang F. Ab initio simulations of ultrashort laser pulse interaction with Cl-Si(100): implications for atomic layer etching. Phys Chem Chem Phys 2023; 25:20871-20879. [PMID: 37522855 DOI: 10.1039/d3cp02388e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/01/2023]
Abstract
Due to the remarkable resistance of SiCl against photo-induced desorption, achieving atomic layer etching (ALE) of Cl-Si(100) through a laser-based method has remained a formidable challenge. In this study, we investigate the interaction between ultrashort laser pulses and the Cl-Si(100) surface via ab initio simulations that combine real-time time-dependent density functional theory and molecular dynamics. Our results demonstrate the direct desorption of the stubborn SiCl layer through the application of appropriate femtosecond laser pulses. Notably, the desorption process is enhanced by pulses with higher laser intensity, shorter wavelength, and longer pulse duration. There is a threshold intensity beyond which the SiCl can be directly desorbed under laser pulses with a wavelength of 488 nm and a pulse duration of 40 ℏ eV-1 (26.3 fs). Analysis of electron localization function reveals a critical bond breaking length of 2.98 Å between Si-Si, connecting SiCl to the bulk material. The time evolution of bond lengths and forces reveals that the desorption of SiCl is primarily driven by repulsive forces generated within the Si-Si bond. Furthermore, electron density difference analysis and Keldysh factor calculations indicate that these repulsive forces arise from multiphoton ionization. This study provides crucial atomic-level insights into the interaction of ultrashort laser pulses with Cl-Si(100), thereby propelling the advancement of laser-induced atomic layer etching techniques.
Collapse
Affiliation(s)
- Peizhi Wang
- Centre of Micro/Nano Manufacturing Technology (MNMT-Dublin), University College Dublin, Dublin 4, Ireland.
| | - Fengzhou Fang
- Centre of Micro/Nano Manufacturing Technology (MNMT-Dublin), University College Dublin, Dublin 4, Ireland.
- State Key Laboratory of Precision Measuring Technology and Instruments, Laboratory of Micro/Nano Manufacturing Technology (MNMT), Tianjin University, Tianjin, 300072, China
| |
Collapse
|
3
|
Melani G, Guerrero-Felipe JP, Valencia AM, Krumland J, Cocchi C, Iannuzzi M. Donors, acceptors, and a bit of aromatics: electronic interactions of molecular adsorbates on hBN and MoS 2 monolayers. Phys Chem Chem Phys 2022; 24:16671-16679. [PMID: 35766517 DOI: 10.1039/d2cp01502a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The design of low-dimensional organic-inorganic interfaces for the next generation of opto-electronic applications requires in-depth understanding of the microscopic mechanisms ruling electronic interactions in these systems. In this work, we present a first-principles study based on density-functional theory inspecting the structural, energetic, and electronic properties of five molecular donors and acceptors adsorbed on freestanding hexagonal boron nitride (hBN) and molybdenum disulfide (MoS2) monolayers. All considered interfaces are stable, due to the crucial contribution of dispersion interactions, which are maximized by the overall flat arrangement of the physisorbed molecules on both substrates. The level alignment of the hybrid systems depends on the characteristics of the constituents. On hBN, both type-I and type-II interfaces may form, depending on the relative energies of the frontier orbitals with respect to the vacuum level. On the other hand, all MoS2-based hybrid systems exhibit a type-II level alignment, with the molecular frontier orbitals positioned across the energy gap of the semiconductor. The electronic structure of the hybrid materials is further determined by the formation of interfacial dipole moments and by the wave-function hybridization between the organic and inorganic constituents. These results provide important indications for the design of novel low-dimensional hybrid materials with suitable characteristics for opto-electronics.
Collapse
Affiliation(s)
- Giacomo Melani
- Department of Chemistry, Universität Zürich, 8057 Zürich, Switzerland. .,Present Address: Pritzker School of Molecular Engineering, University of Chicago, 60637, Chicago, USA
| | - Juan Pablo Guerrero-Felipe
- Physics Department and IRIS Adlesrshof, Humboldt-Universität zu Berlin, 12489 Berlin, Germany. .,Department of Physics, Free University Berlin, 14195 Berlin, Germany
| | - Ana M Valencia
- Physics Department and IRIS Adlesrshof, Humboldt-Universität zu Berlin, 12489 Berlin, Germany. .,Institute of Physics, Carl-von-Ossietzy Universität Oldenburg, 26129 Oldenburg, Germany
| | - Jannis Krumland
- Physics Department and IRIS Adlesrshof, Humboldt-Universität zu Berlin, 12489 Berlin, Germany.
| | - Caterina Cocchi
- Physics Department and IRIS Adlesrshof, Humboldt-Universität zu Berlin, 12489 Berlin, Germany. .,Institute of Physics, Carl-von-Ossietzy Universität Oldenburg, 26129 Oldenburg, Germany
| | - Marcella Iannuzzi
- Department of Chemistry, Universität Zürich, 8057 Zürich, Switzerland.
| |
Collapse
|
4
|
Lei L, Zhang J, Trejo M, Bradford SD, Kong W. Resolving the interlayer distance of cationic pyrene clusters embedded in superfluid helium droplets using electron diffraction. J Chem Phys 2022; 156:051101. [DOI: 10.1063/5.0080365] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Lei Lei
- Department of Chemistry, Oregon State University, Corvallis, Oregon 97331, USA
| | - Jie Zhang
- Department of Chemistry, Oregon State University, Corvallis, Oregon 97331, USA
| | - Marisol Trejo
- Department of Chemistry, Oregon State University, Corvallis, Oregon 97331, USA
| | - Stephen D. Bradford
- Department of Chemistry, Oregon State University, Corvallis, Oregon 97331, USA
| | - Wei Kong
- Department of Chemistry, Oregon State University, Corvallis, Oregon 97331, USA
| |
Collapse
|
5
|
Bonardd S, Díaz Díaz D, Leiva A, Saldías C. Chromophoric Dendrimer-Based Materials: An Overview of Holistic-Integrated Molecular Systems for Fluorescence Resonance Energy Transfer (FRET) Phenomenon. Polymers (Basel) 2021; 13:4404. [PMID: 34960954 PMCID: PMC8705239 DOI: 10.3390/polym13244404] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Revised: 12/09/2021] [Accepted: 12/10/2021] [Indexed: 12/15/2022] Open
Abstract
Dendrimers (from the Greek dendros → tree; meros → part) are macromolecules with well-defined three-dimensional and tree-like structures. Remarkably, this hyperbranched architecture is one of the most ubiquitous, prolific, and recognizable natural patterns observed in nature. The rational design and the synthesis of highly functionalized architectures have been motivated by the need to mimic synthetic and natural-light-induced energy processes. Dendrimers offer an attractive material scaffold to generate innovative, technological, and functional materials because they provide a high amount of peripherally functional groups and void nanoreservoirs. Therefore, dendrimers emerge as excellent candidates since they can play a highly relevant role as unimolecular reactors at the nanoscale, acting as versatile and sophisticated entities. In particular, they can play a key role in the properties of light-energy harvesting and non-radiative energy transfer, allowing them to function as a whole unit. Remarkably, it is possible to promote the occurrence of the FRET phenomenon to concentrate the absorbed energy in photoactive centers. Finally, we think an in-depth understanding of this mechanism allows for diverse and prolific technological applications, such as imaging, biomedical therapy, and the conversion and storage of light energy, among others.
Collapse
Affiliation(s)
- Sebastián Bonardd
- Departamento de Química Orgánica, Universidad de La Laguna, Avda. Astrofísico Francisco Sánchez S/N, La Laguna, 38206 Tenerife, Spain; (S.B.); (D.D.D.)
- Instituto Universitario de Bio-Orgánica Antonio González, Universidad de La Laguna, Avda. Astrofísico Francisco Sánchez 2, La Laguna, 38206 Tenerife, Spain
| | - David Díaz Díaz
- Departamento de Química Orgánica, Universidad de La Laguna, Avda. Astrofísico Francisco Sánchez S/N, La Laguna, 38206 Tenerife, Spain; (S.B.); (D.D.D.)
- Instituto Universitario de Bio-Orgánica Antonio González, Universidad de La Laguna, Avda. Astrofísico Francisco Sánchez 2, La Laguna, 38206 Tenerife, Spain
- Institutfür Organische Chemie, Universität Regensburg, Universitätsstr. 31, 93053 Regensburg, Germany
| | - Angel Leiva
- Departamento de Química Física, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Macul, Santiago, CL 7820436, USA;
| | - César Saldías
- Departamento de Química Física, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Macul, Santiago, CL 7820436, USA;
| |
Collapse
|