Improving quantum efficiency in organic solar cells with a small energetic driving force

2021 ◽  
Author(s):  
Haiqin Liu ◽  
Mengyang Li ◽  
Hongbo Wu ◽  
Jie Wang ◽  
Zaifei Ma ◽  
...  
Keyword(s):  
Solar Cells ◽  
Excited State ◽  
Charge Transfer ◽  
Quantum Efficiency ◽  
Organic Solar Cells ◽  
Driving Force

Organic solar cells based on a polymer donor (PM7) and a non-fullerene acceptor (Y5) with a very small energetic difference between the local excited state and the charge transfer (CT)...

Conditions for efficient charge generation preceded by energy transfer process in non-fullerene organic solar cells

2021 ◽  
Author(s):  
L. Benatto ◽  
C. A. M. Moraes ◽  
G. Candiotto ◽  
K. R. A. Sousa ◽  
J. P. A. Souza ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Solar Cells ◽  
Binding Energy ◽  
Transfer Process ◽  
Organic Solar Cells ◽  
Driving Force ◽  
Energy Transfer Process ◽  
Simple Relationship ◽  
Charge Generation ◽  
Efficient Charge

Our results provide a simple relationship involving the driving force and binding energy of CT state to maximize charge generation in non-fullerene organic solar cells.

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 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

scholarly journals Field Effect versus Driving Force: Charge Generation in Small‐Molecule Organic Solar Cells

2020 ◽  
Vol 10 (47) ◽  
pp. 2002124
Author(s):  
Vasileios C. Nikolis ◽  
Yifan Dong ◽  
Jonas Kublitski ◽  
Johannes Benduhn ◽  
Xijia Zheng ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
Driving Force ◽  
Field Effect ◽  
Charge Generation
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