Comparison of TiO2 and ZnO Solar Cells Sensitized with an Indoline Dye: Time-Resolved Laser Spectroscopy Studies of Partial Charge Separation Processes

Langmuir ◽  
2014 ◽  
Vol 30 (9) ◽  
pp. 2505-2512 ◽  
Author(s):  
Jan Sobuś ◽  
Gotard Burdziński ◽  
Jerzy Karolczak ◽  
Jesús Idígoras ◽  
Juan A. Anta ◽  
...  
Keyword(s):  
Solar Cells ◽  
Laser Spectroscopy ◽  
Charge Separation ◽  
Partial Charge ◽  
Separation Processes ◽  
Time Resolved ◽  
Spectroscopy Studies

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.

A Simple Dyad Exhibiting Microsecond Charge-Separation in Non-Polar Solvents

2006 ◽  
Vol 59 (3) ◽  
pp. 179 ◽  
Author(s):  
Kenneth P. Ghiggino ◽  
James A. Hutchison ◽  
Steven J. Langford ◽  
Melissa J. Latter ◽  
Marcia A.-P. Lee ◽  
...  
Keyword(s):  
Electron Spin ◽  
Charge Separation ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Time Resolved Fluorescence ◽  
Polar Solvents ◽  
Separation Processes ◽  
Time Resolved ◽  
A Charge

A simple photovoltaic device in which two chromophoric components are assembled by Zn–N coordination yields a charge-separated state with microsecond lifetime upon photoexcitation in non-polar solvents. Characterization of the electron transfer dynamics using time-resolved fluorescence and transient absorption spectroscopy suggests that the unusual longevity is due to charge recombination occurring between states with different electron spin character. Control of electron spin may provide a novel paradigm for optimizing light-induced charge-separation processes.

scholarly journals Charge Separation and Triplet Exciton Formation Pathways in Small-Molecule Solar Cells as Studied by Time-Resolved EPR Spectroscopy

2017 ◽  
Vol 121 (41) ◽  
pp. 22707-22719 ◽  
Author(s):  
Stuart A. J. Thomson ◽  
Jens Niklas ◽  
Kristy L. Mardis ◽  
Christopher Mallares ◽  
Ifor D. W. Samuel ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
Epr Spectroscopy ◽  
Charge Separation ◽  
Triplet Exciton ◽  
Time Resolved

scholarly journals Time-resolved photoluminescence measurements for determining voltage-dependent charge-separation efficiencies of subcells in triple-junction solar cells

2015 ◽  
Vol 106 (1) ◽  
pp. 013905 ◽  
Author(s):  
David M. Tex ◽  
Toshiyuki Ihara ◽  
Hidefumi Akiyama ◽  
Mitsuru Imaizumi ◽  
Yoshihiko Kanemitsu
Keyword(s):  
Solar Cells ◽  
Triple Junction ◽  
Charge Separation ◽  
Time Resolved ◽  
Voltage Dependent ◽  
Time Resolved Photoluminescence

Insights into the limitations of solar cells sensitized with ruthenium dyes revealed in time-resolved spectroscopy studies

2017 ◽  
Vol 19 (31) ◽  
pp. 20463-20473 ◽  
Author(s):  
Mateusz Gierszewski ◽  
Iwona Grądzka ◽  
Adam Glinka ◽  
Marcin Ziółek
Keyword(s):  
Solar Cells ◽  
Conduction Band ◽  
Time Scale ◽  
Electron Recombination ◽  
Time Resolved ◽  
Time Resolved Spectroscopy ◽  
Spectroscopy Studies ◽  
Ruthenium Dyes

An important limitation in the photocurrent of solar cells sensitized with Ru dyes and filled with cobalt electrolyte is electron recombination between titania conduction band (CB) and oxidized dyes, which occurs on the sub-ns time scale.

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