Thermally assisted charge transfer and charge separation in organic donor–acceptor solar cells

2020 ◽  
Vol 117 (16) ◽  
pp. 163301
Author(s):  
Teng Gao ◽  
Qiuxia Lu ◽  
Wei Qin ◽  
Fanyao Qu ◽  
Shijie Xie
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Charge Separation ◽  
Donor Acceptor

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.

Charge Separation and Recombination of Charge-Transfer Excitons in Donor–Acceptor Polymer Solar Cells

2013 ◽  
Vol 117 (33) ◽  
pp. 16769-16773 ◽  
Author(s):  
Jun’ya Tsutsumi ◽  
Hiroyuki Matsuzaki ◽  
Naoyuki Kanai ◽  
Toshikazu Yamada ◽  
Tatsuo Hasegawa
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Charge Separation ◽  
Polymer Solar Cells ◽  
Donor Acceptor ◽  
Charge Transfer Excitons

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 Higher-Energy Charge Transfer States Facilitate Charge Separation in Donor–Acceptor Molecular Dyads

2017 ◽  
Vol 121 (24) ◽  
pp. 13043-13051 ◽  
Author(s):  
Donghyun Lee ◽  
Michael A. Forsuelo ◽  
Aleksey A. Kocherzhenko ◽  
K. Birgitta Whaley
Keyword(s):  
Charge Transfer ◽  
Charge Separation ◽  
Energy Charge ◽  
Molecular Dyads ◽  
Donor Acceptor

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
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