Quantum-Chemical Approach to Electronic Coupling:  Application to Charge Separation and Charge Recombination Pathways in a Model Molecular Donor−Acceptor System for Organic Solar Cells

2008 ◽  
Vol 112 (9) ◽  
pp. 3429-3433 ◽  
Author(s):  
Tsutomu Kawatsu ◽  
Veaceslav Coropceanu ◽  
Aijun Ye ◽  
Jean-Luc Brédas
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Charge Separation ◽  
Quantum Chemical ◽  
Charge Recombination ◽  
Electronic Coupling ◽  
Chemical Approach ◽  
Donor Acceptor ◽  
Quantum Chemical Approach

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.

Controlling charge separation and recombination by chemical design in donor–acceptor dyads

2016 ◽  
Vol 18 (27) ◽  
pp. 18536-18548 ◽  
Author(s):  
Li Liu ◽  
Pierre Eisenbrandt ◽  
Thomas Roland ◽  
Matthias Polkehn ◽  
Pierre-Olivier Schwartz ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Charge Separation ◽  
Chemical Design ◽  
Potential Applications ◽  
Donor Acceptor

Conjugated donor–acceptor block co-oligomers that self-organize into D–A mesomorphic arrays have raised increasing interest due to their potential applications in organic solar cells.

Effects of end-on oriented polymer chains at the donor/acceptor interface in organic solar cells

2018 ◽  
Vol 6 (45) ◽  
pp. 22889-22898 ◽  
Author(s):  
Fanji Wang ◽  
Kyohei Nakano ◽  
Hiroyuki Yoshida ◽  
Kazuhito Hashimoto ◽  
Hiroshi Segawa ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Charge Separation ◽  
Polymer Chains ◽  
Oriented Polymer ◽  
Coulombic Interaction ◽  
Donor And Acceptor ◽  
Donor Acceptor

Intrachain hole delocalization vertical to donor and acceptor interface weakens coulombic interaction of the charge pairs and facilitate the charge separation in organic solar cells.

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