On the Dissociation Efficiency of Charge Transfer Excitons and Frenkel Excitons in Organic Solar Cells: A Luminescence Quenching Study

2010 ◽  
Vol 114 (49) ◽  
pp. 21824-21832 ◽  
Author(s):  
Kristofer Tvingstedt ◽  
Koen Vandewal ◽  
Fengling Zhang ◽  
Olle Inganäs
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Organic Solar Cells ◽  
Luminescence Quenching ◽  
Dissociation Efficiency ◽  
Frenkel Excitons ◽  
Charge Transfer Excitons

Dynamics of Charge Transfer Excitons Recombination in Polymer/Fullerene Solar Cells

2011 ◽  
Vol 1286 ◽  
Author(s):  
Markus Hallermann ◽  
Felix Deschler ◽  
Josef Berger ◽  
Elizabeth von Hauff ◽  
Enrico Da Como
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Power Law ◽  
Organic Solar Cells ◽  
Short Circuit ◽  
Strong Dependence ◽  
Acid Methyl Ester ◽  
Open Circuit ◽  
Fullerene Derivative ◽  
Charge Transfer Excitons

ABSTRACTAmong the different recombination mechanisms in organic solar cells the photoluminescence (PL) of charge transfer excitons (CTEs) has been identified has one of the most important, impacting both the open circuit voltage and the short circuit current. Here, we study their recombination dynamics, monitoring the decay of the PL on a time scale spanning three orders of magnitude from nanoseconds to microseconds. As a model system we investigate blends of the conjugated polymer poly(2-methoxy-5-(3′,7′-dimethyloctyloxy)-1,4-phenylene-vinylene) (MDMO-PPV) and the fullerene derivative [6,6]-phenyl C61-butyric acid methyl ester (PCBM). We observe that the dynamics of recombination follows a power-law, which is independent of sample morphology. Upon application of a transient electric field, which is capable of separating the bound charge pairs, we observe different dynamics of recombination only for the separated pairs. Those also follow a power-law and show a strong dependence on the film morphology.

Uphill and downhill charge generation from charge transfer to charge separated states in organic solar cells

2021 ◽  
Author(s):  
Shahidul Alam ◽  
Vojtech Nádaždy ◽  
Tomáš Váry ◽  
Christian Friebe ◽  
Rico Meitzner ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Solar Cells ◽  
Charge Transfer ◽  
Energy Level ◽  
Density Of States ◽  
Organic Solar Cells ◽  
Joint Density ◽  
Charge Generation ◽  
Donor Acceptor

Energy level alignments at the organic donor–acceptor interface cannot be predicted from cyclic voltammetry. Onsets for joint density of states and charge generation, reveal cases of energy uphill and – newly observed – downhill charge generation.

scholarly journals Diffusion-enhanced exciton dissociation in single-material organic solar cells

2021 ◽  
Vol 23 (37) ◽  
pp. 20848-20853
Author(s):  
Nong V. Hoang ◽  
Vasileios C. Nikolis ◽  
Lukasz Baisinger ◽  
Koen Vandewal ◽  
Maxim S. Pshenichnikov
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Domain Boundary ◽  
Exciton Dissociation ◽  
Dissociation Efficiency ◽  
Single Material

Multiple crossings at the domain boundary with different molecular orientations enhance the exciton dissociation efficiency in single-material organic solar cells.

scholarly journals Dissociation of Charge Transfer States and Carrier Separation in Bilayer Organic Solar Cells: A Time-Resolved Electroabsorption Spectroscopy Study

2015 ◽  
Vol 137 (25) ◽  
pp. 8192-8198 ◽  
Author(s):  
Andrius Devižis ◽  
Jelissa De Jonghe-Risse ◽  
Roland Hany ◽  
Frank Nüesch ◽  
Sandra Jenatsch ◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Organic Solar Cells ◽  
Spectroscopy Study ◽  
Time Resolved ◽  
Electroabsorption Spectroscopy ◽  
Carrier Separation

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 Experimental Evidence Relating Charge-Transfer-State Kinetics and Strongly Reduced Bimolecular Recombination in Organic Solar Cells

2020 ◽  
Vol 11 (24) ◽  
pp. 10519-10525
Author(s):  
Nasim Zarrabi ◽  
Oskar J. Sandberg ◽  
Christina Kaiser ◽  
Jegadesan Subbiah ◽  
David J. Jones ◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Experimental Evidence ◽  
Organic Solar Cells ◽  
Charge Transfer State ◽  
Bimolecular Recombination ◽  
Transfer State
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