scholarly journals Higher-Energy Charge Transfer States Facilitate Charge Separation in Donor–Acceptor Molecular Dyads

2017 ◽  
Vol 121 (24) ◽  
pp. 13043-13051 ◽  
Author(s):  
Donghyun Lee ◽  
Michael A. Forsuelo ◽  
Aleksey A. Kocherzhenko ◽  
K. Birgitta Whaley
Keyword(s):  
Charge Transfer ◽  
Charge Separation ◽  
Energy Charge ◽  
Molecular Dyads ◽  
Donor Acceptor

Thermally assisted charge transfer and charge separation in organic donor–acceptor solar cells

2020 ◽  
Vol 117 (16) ◽  
pp. 163301
Author(s):  
Teng Gao ◽  
Qiuxia Lu ◽  
Wei Qin ◽  
Fanyao Qu ◽  
Shijie Xie
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Charge Separation ◽  
Donor Acceptor

New development of photoinduced electron-transfer catalytic systems

2007 ◽  
Vol 79 (6) ◽  
pp. 981-991 ◽  
Author(s):  
Shunichi Fukuzumi
Keyword(s):  
Electron Transfer ◽  
Organic Solar Cells ◽  
Charge Separation ◽  
Energy Charge ◽  
High Energy ◽  
Significant Loss ◽  
Catalytic Systems ◽  
Molecular Electron ◽  
New Development ◽  
Donor Acceptor

As an alternative to conventional charge-separation functional molecular models based on multi-step long-range electron transfer (ET) within redox cascades, simple donor-acceptor dyads have been developed to attain a long-lived and high-energy charge-separated (CS) state without significant loss of excitation energy. In particular, a simple molecular electron donor-acceptor dyad, 9-mesityl-10-methylacridinium ion (Acr+-Mes), is capable of fast charge separation but extremely slow charge recombination. Such a simple molecular dyad has significant advantages with regard to synthetic feasibility, providing a variety of applications for photoinduced ET catalytic systems, including efficient photocatalytic systems for the solar energy conversion and construction of organic solar cells.

scholarly journals Long-lived and disorder-free charge transfer states enable endothermic charge separation in efficient non-fullerene organic solar cells

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Ture F. Hinrichsen ◽  
Christopher C. S. Chan ◽  
Chao Ma ◽  
David Paleček ◽  
Alexander Gillett ◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Organic Solar Cells ◽  
Charge Separation ◽  
Free Charge ◽  
Charge Generation ◽  
Time Resolved ◽  
Thermodynamic Conditions ◽  
Donor Acceptor ◽  
Interfacial Charge

Abstract Organic solar cells based on non-fullerene acceptors can show high charge generation yields despite near-zero donor–acceptor energy offsets to drive charge separation and overcome the mutual Coulomb attraction between electron and hole. Here, we use time-resolved optical spectroscopy to show that free charges in these systems are generated by thermally activated dissociation of interfacial charge-transfer states that occurs over hundreds of picoseconds at room temperature, three orders of magnitude slower than comparable fullerene-based systems. Upon free electron–hole encounters at later times, both charge-transfer states and emissive excitons are regenerated, thus setting up an equilibrium between excitons, charge-transfer states and free charges. Our results suggest that the formation of long-lived and disorder-free charge-transfer states in these systems enables them to operate closely to quasi-thermodynamic conditions with no requirement for energy offsets to drive interfacial charge separation and achieve suppressed non-radiative recombination.

scholarly journals Controlling charge separation in a novel donor–acceptor metal–organic framework via redox modulation

2014 ◽  
Vol 5 (12) ◽  
pp. 4724-4728 ◽  
Author(s):  
C. F. Leong ◽  
B. Chan ◽  
T. B. Faust ◽  
D. M. D'Alessandro
Keyword(s):  
Charge Transfer ◽  
Solid State ◽  
Charge Separation ◽  
Metal Organic Framework ◽  
Redox Modulation ◽  
Naphthalene Diimide ◽  
Computational Calculations ◽  
Donor Acceptor ◽  
Metal Organic ◽  
Organic Framework

Donor–acceptor charge transfer interactions in a tetrathiafulvalene–naphthalene diimide-based metal–organic framework (MOF) are interrogated using a complementary suite of solid state spectroscopic, electrochemical and spectroelectrochemical methods along with computational calculations.

scholarly journals Charge Transfer in Self-Assembled Fullerene-Tetraphenylporphyrin Non-Covalent Multilayer

2022 ◽  
Author(s):  
Karla Arlen Ortiz ◽  
Oscar A. Jaramillo-Quintero ◽  
Edgar Alvarez-Zauco ◽  
Marina Elizabeth Rincón González
Keyword(s):  
Charge Transfer ◽  
Self Assembly ◽  
Charge Separation ◽  
Physical Vapor Deposition ◽  
Multilayer Film ◽  
Soret Band ◽  
Binding Modes ◽  
Trap States ◽  
Multilayer Systems ◽  
Donor Acceptor

Abstract Self-assembly of organic molecules is a promising method for generating multilayer systems for fabrication of functional devices. In particular, fullerene (C60) and porphyrin molecules offer a variety of binding modes, including π-π interactions, dipole electrostatic attraction, and hydrogen bonding, to tailor the charge separation and charge recombination limiting device performance. Here, we investigate multilayer systems obtained by the sequential physical vapor deposition of C60 and tetraphenylporphyrin (H2TPP) layers, focusing on the effect of the interfaces on the charge transfer processes. Absorbance spectra indicate noncovalent-like π-stacking, with the increment of fullerene interfaces shifting the porphyrin Soret band toward the blue. Similarly, surface photovoltage measurements in the multilayer systems show that as the number of interfaces increases, so does the photogeneration of charge. Charge separation follows carrier generation given that the recombination time, associated to trap states, decreases. This behavior indicates that the Donor-Acceptor nature of the fullerene-porphyrin bilayer system is conserved, and even enhanced, in the multilayer film, and that the number of interfaces aid to the formation of selective paths for charge carrier collection, demonstrating its potential in optoelectronic devices.

From charge-transfer to a charge-separated state: a perspective from the real-time TDDFT excitonic dynamics

2014 ◽  
Vol 16 (44) ◽  
pp. 24457-24465 ◽  
Author(s):  
Alessio Petrone ◽  
David B. Lingerfelt ◽  
Nadia Rega ◽  
Xiaosong Li
Keyword(s):  
Charge Transfer ◽  
Block Copolymers ◽  
Real Time ◽  
Charge Separation ◽  
The Real ◽  
Separation Mechanisms ◽  
Electronic Dynamics ◽  
Donor Acceptor ◽  
A Charge

Real-time TDDFT electronic dynamics for studying the charge separation mechanisms in donor/acceptor block copolymers.

Quadrupolar Cyclopenta[ hi ]aceanthrylene‐Based Electron Donor‐Acceptor‐Donor Conjugates: Charge Transfer versus Charge Separation

2019 ◽  
Vol 131 (41) ◽  
pp. 14786-14794
Author(s):  
Christoph Schierl ◽  
Wiebke Alex ◽  
Luis M. Mateo ◽  
Beatriz Ballesteros ◽  
Daiki Shimizu ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Electron Donor ◽  
Charge Separation ◽  
Donor Acceptor

Quadrupolar Cyclopenta[ hi ]aceanthrylene‐Based Electron Donor‐Acceptor‐Donor Conjugates: Charge Transfer versus Charge Separation

2019 ◽  
Vol 58 (41) ◽  
pp. 14644-14652 ◽  
Author(s):  
Christoph Schierl ◽  
Wiebke Alex ◽  
Luis M. Mateo ◽  
Beatriz Ballesteros ◽  
Daiki Shimizu ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Electron Donor ◽  
Charge Separation ◽  
Donor Acceptor
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