Fluorene functionalised sexithiophenes—utilising intramolecular charge transfer to extend the photocurrent spectrum in organic solar cells

2007 ◽  
Vol 17 (11) ◽  
pp. 1055-1062 ◽  
Author(s):  
Peter J. Skabara ◽  
Rory Berridge ◽  
Igor M. Serebryakov ◽  
Alexander L. Kanibolotsky ◽  
Lyudmila Kanibolotskaya ◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Organic Solar Cells ◽  
Intramolecular Charge Transfer ◽  
Photocurrent Spectrum

An A–D–A′–D–A type small molecule acceptor with a broad absorption spectrum for organic solar cells

2018 ◽  
Vol 54 (3) ◽  
pp. 303-306 ◽  
Author(s):  
Junhui Miao ◽  
Bin Meng ◽  
Jun Liu ◽  
Lixiang Wang
Keyword(s):  
Absorption Spectrum ◽  
Solar Cells ◽  
Charge Transfer ◽  
Absorption Spectra ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
Intramolecular Charge Transfer ◽  
Transfer Effect ◽  
Broad Absorption

The use of an A–D–A′–D–A strategy to develop small molecule acceptors with broad absorption spectra through suppressing the intramolecular charge transfer effect is studied.

Enhanced intramolecular charge transfer of unfused electron acceptors for efficient organic solar cells

2019 ◽  
Vol 3 (3) ◽  
pp. 513-519 ◽  
Author(s):  
Ran Qin ◽  
Weitao Yang ◽  
Shuixing Li ◽  
Tsz-Ki Lau ◽  
Zhipeng Yu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Organic Solar Cells ◽  
Intramolecular Charge Transfer ◽  
Electron Acceptors ◽  
Transfer Effects ◽  
Planar Configuration ◽  
Non Covalent Interactions ◽  
Covalent Interactions

The mediation of non-covalent interactions allowed unfused structures to exhibit a nearly planar configuration with strong charge-transfer effects, thereby ensuring efficient organic solar cells.

scholarly journals Single-Component Organic Solar Cells Based on Intramolecular Charge Transfer Photoabsorption

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1200
Author(s):  
Ken-ichi Nakayama ◽  
Tatsuya Okura ◽  
Yuki Okuda ◽  
Jun Matsui ◽  
Akito Masuhara ◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Organic Solar Cells ◽  
Intramolecular Charge Transfer ◽  
Internal Quantum Efficiency ◽  
Single Component ◽  
Chemical Calculation ◽  
Key Factor ◽  
Donor Acceptor ◽  
Acceptor Molecules

Conjugated donor–acceptor molecules with intramolecular charge transfer absorption are employed for single-component organic solar cells. Among the five types of donor–acceptor molecules, the strong push–pull structure of DTDCPB resulted in solar cells with high JSC, an internal quantum efficiency exceeding 20%, and high VOC exceeding 1 V with little photon energy loss around 0.7 eV. The exciton binding energy (EBE), which is a key factor in enhancing the photocurrent in the single-component device, was determined by quantum chemical calculation. The relationship between the photoexcited state and the device performance suggests that the strong internal charge transfer is effective for reducing the EBE. Furthermore, molecular packing in the film is shown to influence photogeneration in the film bulk.

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.

Charge generation mediated by bound polaron pairs and delocalized charge transfer states in non-fullerene organic solar cells

2020 ◽  
Author(s):  
Yin Song ◽  
Xiao Liu ◽  
Yongxi Li ◽  
Hoang Huy Nguyen ◽  
Rong Duan ◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Organic Solar Cells ◽  
Charge Generation ◽  
Bound Polaron

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.

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