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.

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.

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.

Temperature dependent behavior of flat and bulk heterojunction organic solar cells

2013 ◽  
Vol 1493 ◽  
pp. 269-273 ◽  
Author(s):  
Johannes Widmer ◽  
Karl Leo ◽  
Moritz Riede
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Bulk Heterojunction ◽  
Qualitative Difference ◽  
Open Circuit ◽  
Illumination Intensity ◽  
Zinc Phthalocyanine ◽  
Dependent Behavior ◽  
Donor And Acceptor ◽  
Donor Acceptor

ABSTRACTThe open-circuit voltage of an organic solar cell is increasing with decreasing temperature and with increasing illumination intensity. These dependencies are quantitatively investigated for two types of organic solar cells, one with a flat donor-acceptor heterojunction and one with a mixed layer bulk heterojunction. Zinc-phthalocyanine and C60 are used as donor and acceptor, respectively. A qualitative difference is found for the two geometries. We find that a logarithmic illumination intensity dependence with temperature as a linear pre-factor of the logarithm, which is commonly reported and observed, is applicable for the bulk heterojunction. The flat heterojunction, in contrast, shows a constant illumination intensity pre-factor which is independent of the temperature, and the temperature can be modeled as additional linear summand.

scholarly journals Efficient non-fullerene organic solar cells employing sequentially deposited donor–acceptor layers

2018 ◽  
Vol 6 (37) ◽  
pp. 18225-18233 ◽  
Author(s):  
Jiangbin Zhang ◽  
Bin Kan ◽  
Andrew J. Pearson ◽  
Andrew J. Parnell ◽  
Joshaniel F. K. Cooper ◽  
...  
Keyword(s):  
Solar Cells ◽  
Power Conversion Efficiency ◽  
Conversion Efficiency ◽  
Organic Solar Cells ◽  
Power Conversion ◽  
Fabrication Method ◽  
Donor And Acceptor ◽  
Donor Acceptor

A new fabrication method via sequentially depositing donor and acceptor layers can push the power conversion efficiency of organic solar cells based on non-fullerene acceptors to over 10%.

On the Physical Origins of Charge Separation at Donor–Acceptor Interfaces in Organic Solar Cells: Energy Bending versus Energy Disorder

2020 ◽  
Vol 3 (4) ◽  
pp. 1900230 ◽  
Author(s):  
Leonardo Evaristo Sousa ◽  
Veaceslav Coropceanu ◽  
Demétrio Antônio da Silva Filho ◽  
Gjergji Sini
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Charge Separation ◽  
Energy Disorder ◽  
Donor Acceptor
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