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

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.

Importance of Energetic Driving Force for Efficient Charge Separation in Non-fullerene Organic Solar Cells

2019 ◽  
Author(s):  
SAFAKATH KARUTHEDATH ◽  
Julien Gorenflot ◽  
Anastasia Markina ◽  
Yuliar Firdaus ◽  
Ahmed H. Balawi ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Charge Separation ◽  
Driving Force ◽  
Efficient Charge

scholarly journals Cascaded energy landscape as a key driver for slow yet efficient charge separation with small energy offset in organic solar cells

2021 ◽  
Author(s):  
Shin-ichiro Natsuda ◽  
Toshiharu Saito ◽  
Rei Shirouchi ◽  
Yuji Sakamoto ◽  
Taiki Takeyama ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Charge Separation ◽  
Energy Landscape ◽  
Small Energy ◽  
Efficient Charge ◽  
Key Driver

Synergistic Effect Incorporating Intra- and Inter-Molecular Charge Transfer in Nonfullerene Acceptor Molecules for High-Efficient Organic Solar Cells

2021 ◽  
Author(s):  
Yiwen Ji ◽  
Lingxia Xu ◽  
Hang Yin ◽  
Bin Cui ◽  
Longlong Zhang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Organic Solar Cells ◽  
Specific Mechanism ◽  
Charge Generation ◽  
High Efficient ◽  
Molecular Charge ◽  
Efficient Charge ◽  
Donor Acceptor ◽  
Nonfullerene Acceptor

Organic solar cells (OSCs) based on nonfullerene acceptors (NFAs) have achieved rapid developments benefiting from the near-zero donor/acceptor (D/A) energy offset. However, a specific mechanism underlying the high-efficient charge generation...

Charge-transfer electronic states in organic solar cells: a TDDFT study

2021 ◽  
Author(s):  
Andres F. Marmolejo-Valencia ◽  
Zaahel Mata-Pinzón ◽  
Carlos Amador-Bedolla
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Organic Solar Cells ◽  
Charge Separation ◽  
Organic Photovoltaic ◽  
Precise Description ◽  
Transfer Processes ◽  
Photovoltaic Materials ◽  
Organic Photovoltaic Materials ◽  
Electron Transfer Processes

Prediction of new organic photovoltaic materials in solar cells must include a precise description of charge-transfer states that are involved in electron-transfer processes such as charge separation and charge recombination which govern efficiency.

scholarly journals Cascaded energy landscape as a key driver for slow yet efficient charge separation with small energy offset in organic solar cells

2021 ◽  
Author(s):  
Shin-ichiro Natsuda ◽  
Toshiharu Saito ◽  
Rei Shirouchi ◽  
Yuji Sakamoto ◽  
Taiki Takeyama ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Charge Separation ◽  
Energy Landscape ◽  
Small Energy ◽  
Efficient Charge ◽  
Key Driver

Evidence for Field-Dependent Charge Separation Caused by Mixed Phases in Polymer–Fullerene Organic Solar Cells

2021 ◽  
Vol 12 (7) ◽  
pp. 1847-1853
Author(s):  
Prabodh Dhakal ◽  
Thomas Ferron ◽  
Awwad Alotaibi ◽  
Victor Murcia ◽  
Obaid Alqahtani ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Charge Separation ◽  
Field Dependent

Rational compatibility in ternary matrix enables all-small-molecule organic solar cells with over 16% efficiency

2021 ◽  
Author(s):  
Mengyun Jiang ◽  
Hairui Bai ◽  
Hongfu Zhi ◽  
Lu Yan ◽  
Han Young Woo ◽  
...  
Keyword(s):  
Solar Cells ◽  
Phase Separation ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
Charge Generation ◽  
Molecular Arrangement ◽  
Efficient Charge

How to manipulate the phase separation and molecular arrangement to meet the need of efficient charge generation and extraction remains as the long-standing challenge in all-small-molecule organic solar cells (ASM-OSCs)....

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