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

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.

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Branched Electron-Donor Core Effect in D-π-A Star-Shaped Small Molecules on Their Properties and Performance in Single-Component and Bulk-Heterojunction Organic Solar Cells

Energies ◽

10.3390/en14123596 ◽

2021 ◽

Vol 14 (12) ◽

pp. 3596

Author(s):

Alexander N. Solodukhin ◽

Yuriy N. Luponosov ◽

Artur L. Mannanov ◽

Petr S. Savchenko ◽

Artem V. Bakirov ◽

...

Keyword(s):

Solar Cells ◽

Organic Solar Cells ◽

Bulk Heterojunction ◽

Photovoltaic Performance ◽

Charge Carrier Mobility ◽

Single Component ◽

Orbital Energy ◽

Donor Acceptor ◽

And Performance ◽

Acceptor Molecules

Star-shaped donor-acceptor molecules are full of promise for organic photovoltaics and electronics. However, the effect of the branching core on physicochemical properties, charge transport and photovoltaic performance of such donor-acceptor materials in single-component (SC) and bulk heterojunction (BHJ) organic solar cells has not been thoroughly addressed. This work shows the comprehensive investigation of six star-shaped donor-acceptor molecules with terminal hexyldicyanovinyl blocks linked through 2,2′-bithiophene π-conjugated bridge to different electron-donating cores such as the pristine and fused triphenylamine, tris(2-methoxyphenyl)amine, carbazole- and benzotriindole-based units. Variation of the branching core strongly impacts on such important properties as the solubility, highest occupied molecular orbital energy, optical absorption, phase behavior, molecular packing and also on the charge-carrier mobility. The performance of SC or BHJ organic solar cells are comprehensively studied and compared. The results obtained provide insight on how to predict and fine-tune photovoltaic performance as well as properties of donor-acceptor star-shaped molecules for organic solar cells.

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Uphill and downhill charge generation from charge transfer to charge separated states in organic solar cells

Journal of Materials Chemistry C ◽

10.1039/d1tc02351a ◽

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.

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Non-Adiabatic Photoprocesses of Fundamental Importance to Chemistry: From Electronic Relaxation of DNA Bases to Intramolecular Charge Transfer in Electron Donor-Acceptor Molecules

Challenges and Advances In Computational Chemistry and Physics - Radiation Induced Molecular Phenomena in Nucleic Acids ◽

10.1007/978-1-4020-8184-2_15 ◽

2008 ◽

pp. 395-433

Author(s):

Marek Z. Zgierski ◽

Takashige Fujiwara ◽

Edward C. Lim

Keyword(s):

Charge Transfer ◽

Electron Donor ◽

Intramolecular Charge Transfer ◽

Dna Bases ◽

Fundamental Importance ◽

Electronic Relaxation ◽

Donor Acceptor ◽

Acceptor Molecules

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Star-shaped benzotriindole-based donor-acceptor molecules: Synthesis, properties and application in bulk heterojunction and single-material organic solar cells

Dyes and Pigments ◽

10.1016/j.dyepig.2020.108523 ◽

2020 ◽

Vol 181 ◽

pp. 108523 ◽

Cited By ~ 2

Author(s):

Dmitry O. Balakirev ◽

Yuriy N. Luponosov ◽

Artur L. Mannanov ◽

Petr S. Savchenko ◽

Yury Minenkov ◽

...

Keyword(s):

Solar Cells ◽

Organic Solar Cells ◽

Bulk Heterojunction ◽

Synthesis Properties ◽

Donor Acceptor ◽

Single Material ◽

Acceptor Molecules

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Thieno[3,4-c]pyrrole-4,6-dione-based conjugated polymers for organic solar cells

Chemical Communications ◽

10.1039/d0cc04150e ◽

2020 ◽

Vol 56 (72) ◽

pp. 10394-10408

Author(s):

Chaowei Zhao ◽

Fan Yang ◽

Dongdong Xia ◽

Zhou Zhang ◽

Yuefeng Zhang ◽

...

Keyword(s):

Solar Cells ◽

Conjugated Polymers ◽

Electron Donor ◽

Organic Solar Cells ◽

Single Component ◽

Feature Article ◽

The Past ◽

Donor Acceptor

Thieno[3,4-c]pyrrole-4,6-dione (TPD) based conjugated polymers as an electron donor, acceptor and single-component for application in organic solar cells in the past ten years have been intensively reviewed in this Feature Article.

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Long-lived and disorder-free charge transfer states enable endothermic charge separation in efficient non-fullerene organic solar cells

Nature Communications ◽

10.1038/s41467-020-19332-5 ◽

2020 ◽

Vol 11 (1) ◽

Cited By ~ 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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Designing indacenodithiophene based non-fullerene acceptors with a donor–acceptor combined bridge for organic solar cells

RSC Advances ◽

10.1039/c8ra09292c ◽

2019 ◽

Vol 9 (7) ◽

pp. 3605-3617 ◽

Cited By ~ 19

Author(s):

Muhammad Ans ◽

Khurshid Ayub ◽

Ijaz Ahmad Bhatti ◽

Javed Iqbal

Keyword(s):

Solar Cells ◽

Organic Solar Cells ◽

Donor Acceptor ◽

Significant Attention ◽

Acceptor Molecules

Non-fullerene small acceptor molecules have gained significant attention for application in organic solar cells owing to their advantages over fullerene based acceptors.

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