Hot charge-transfer excitons set the time limit for charge separation at donor/acceptor interfaces in organic photovoltaics

2012 ◽  
Vol 12 (1) ◽  
pp. 66-73 ◽  
Author(s):  
Askat E. Jailaubekov ◽  
Adam P. Willard ◽  
John R. Tritsch ◽  
Wai-Lun Chan ◽  
Na Sai ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Organic Photovoltaics ◽  
Charge Separation ◽  
Time Limit ◽  
Donor Acceptor ◽  
Charge Transfer Excitons

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

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 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 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 Controlling charge separation in a novel donor–acceptor metal–organic framework via redox modulation

2014 ◽  
Vol 5 (12) ◽  
pp. 4724-4728 ◽  
Author(s):  
C. F. Leong ◽  
B. Chan ◽  
T. B. Faust ◽  
D. M. D'Alessandro
Keyword(s):  
Charge Transfer ◽  
Solid State ◽  
Charge Separation ◽  
Metal Organic Framework ◽  
Redox Modulation ◽  
Naphthalene Diimide ◽  
Computational Calculations ◽  
Donor Acceptor ◽  
Metal Organic ◽  
Organic Framework

Donor–acceptor charge transfer interactions in a tetrathiafulvalene–naphthalene diimide-based metal–organic framework (MOF) are interrogated using a complementary suite of solid state spectroscopic, electrochemical and spectroelectrochemical methods along with computational calculations.

scholarly journals Charge transfer excitons in a donor–acceptor amphidynamic crystal: the role of dipole orientational order

2020 ◽  
Vol 7 (11) ◽  
pp. 2951-2958
Author(s):  
Joshua W. R. Macdonald ◽  
Giacomo Piana ◽  
Massimiliano Comin ◽  
Elizabeth von Hauff ◽  
Gabriele Kociok-Köhn ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Large Amplitude ◽  
Orientational Order ◽  
Molecular Solids ◽  
Electrical Characteristics ◽  
Large Amplitude Motions ◽  
Donor Acceptor ◽  
Charge Transfer Excitons

Large amplitude motions in molecular solids are responsible for anomalous electrical characteristics in amphidynamic crystals. Here we explore the implications for charge transfer excitons photophysics.

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