Ultrafast Long-Range Charge Separation in Nonfullerene Organic Solar Cells

ACS Nano ◽  
2017 ◽  
Vol 11 (12) ◽  
pp. 12473-12481 ◽  
Author(s):  
Yasunari Tamai ◽  
Yeli Fan ◽  
Vincent O. Kim ◽  
Kostiantyn Ziabrev ◽  
Akshay Rao ◽  
...  
Keyword(s):  
Solar Cells ◽  
Long Range ◽  
Organic Solar Cells ◽  
Charge Separation

Evidence for Field-Dependent Charge Separation Caused by Mixed Phases in Polymer–Fullerene Organic Solar Cells

2021 ◽  
Vol 12 (7) ◽  
pp. 1847-1853
Author(s):  
Prabodh Dhakal ◽  
Thomas Ferron ◽  
Awwad Alotaibi ◽  
Victor Murcia ◽  
Obaid Alqahtani ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Charge Separation ◽  
Field Dependent

Low Band-Gap Materials for Solar Cells

2021 ◽  
pp. 176-235
Keyword(s):  
Solar Cells ◽  
Band Gap ◽  
Organic Solar Cells ◽  
Charge Separation ◽  
Chemical Properties ◽  
Low Energy ◽  
Practical Applications ◽  
Film Forming ◽  
Donor And Acceptor ◽  
Induced Charge

Organic solar cells (OSCs) are discussed at length in terms of its performance leading to the generation of electricity. The key materials required for OSCs are the small organic molecules having donor and acceptor with suitable light absorption and electro-chemical properties of low energy band gap. Various structural scaffolds are highlighted with their structural design leading to film forming in an orderly manner and this morphology of film having a pivotal role in photo-induced charge separation, migration and collection at an electrode. Present day research informs that OSCs involving non fullerene based donors and acceptors are functioning with high photo conversion efficiency [PCE] of >17% and are promising candidates for practical applications.

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 Efficient Charge Separation of Cold Charge-Transfer States in Organic Solar Cells Through Incoherent Hopping

2017 ◽  
Vol 8 (9) ◽  
pp. 2093-2098 ◽  
Author(s):  
Stavros Athanasopoulos ◽  
Steffen Tscheuschner ◽  
Heinz Bässler ◽  
Anna Köhler
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Organic Solar Cells ◽  
Charge Separation ◽  
Cold Charge ◽  
Efficient Charge

Designing high performance all-small-molecule solar cells with non-fullerene acceptors: comprehensive studies on photoexcitation dynamics and charge separation kinetics

2018 ◽  
Vol 11 (1) ◽  
pp. 211-220 ◽  
Author(s):  
Junqing Shi ◽  
Anna Isakova ◽  
Abasi Abudulimu ◽  
Marius van den Berg ◽  
Oh Kyu Kwon ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
Charge Separation ◽  
High Performance ◽  
High Definition ◽  
Definition Of ◽  
Separation Kinetics ◽  
Comprehensive Studies

High definition of all-small molecule materials for organic solar cells allows slow separation of localized charges.

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.

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