Probing the regeneration process of triphenylamine-based organic dyes in dye-sensitized solar cells

Sun, Zhu-Zhu; Li, Quan-Song; Sun, Pingping; Li, Ze-Sheng

doi:10.1016/j.jpowsour.2014.11.107

Cited by 24 publications

(8 citation statements)

References 61 publications

(36 reference statements)

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“…The sensitized dye is probably one of the key elements in DSSCs since it governs the photon harvesting and the charge (electron–hole) generation as well as separation. − Generally, dyes fall into two broad categories: ruthenium (Ru)-polypyridyl complexes , and pure organic push–pull dyes. , For a long time, Ru-complexes were the “champion” dyes for DSSCs, with a power conversion efficiency higher than 11% . However, ruthenium is not an “earth abundant element”, which may limit widespread application.…”

Section: Introductionmentioning

confidence: 99%

Insight into D–A−π–A Structured Sensitizers: A Promising Route to Highly Efficient and Stable Dye-Sensitized Solar Cells

Zhu

Zakeeruddin

et al. 2015

ACS Appl. Mater. Interfaces

288

138

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The dye-sensitized solar cell (DSSC) is one of the most promising photovoltaic technologies with potential of low cost, light weight, and good flexibility. The practical application of DSSCs requires further improvement in power conversion efficiency and long-term stability. Recently, significant progress has been witnessed in DSSC research owing to the novel concept of the D-A-π-A motif for the molecular engineering of organic photosensitizers. New organic and porphyrin dyes based on the D-A-π-A motif can not only enhance photovoltaic performance, but also improve durability in DSSC applications. This Spotlight on Applications highlights recent advances in the D-A-π-A-based photosensitizers, specifically focusing on the mechanism of efficiency and stability enhancements. Also, we find insight into the additional acceptor as well as the trade-off of long wavelength response. The basic principles are involved in molecular engineering of efficient D-A-π-A sensitizers, providing a clear road map showing how to modulate the energy bands, rationally extending the response wavelength, and optimizing photovoltaic efficiency step by step.

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Section: Introductionmentioning

confidence: 99%

Insight into D–A−π–A Structured Sensitizers: A Promising Route to Highly Efficient and Stable Dye-Sensitized Solar Cells

Zhu

Zakeeruddin

et al. 2015

ACS Appl. Mater. Interfaces

288

138

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“…theorem [43][44][45], different global reactivity descriptors, i.e., electronegativity (χ), hardness (η), softness (S), chemical potential (μ) and electrophilicity index (ΔE), are computed by means of the energies of ionization potential (IP) and electron affinity (EA). The smaller ionization potentials are favorable for electron transfer to semiconductor substrate, and the larger electron affinities inhibit electron transfer from photo-anode to photosensitive layer.…”

Section: Global Reactivity Descriptors On the Basis Of Koopmans'mentioning

confidence: 99%

Enhancing Charge Transfer and Photoelectric Characteristics for Organic Solar Cells

Wang

Pei

2020

Journal of Nanomaterials

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The main purpose of this work is to analyze the effect of steric hindrance on the photoelectric performance of three different donor sensitizers (ZHG5, ZHG6, and ZHG7) by molecular theory simulation engineering. Photoelectric physical and photoelectric chemical parameters are investigated by means of frontier molecular orbital, global reactivity descriptors, optical absorption properties, fluorescent lifetime, charge density difference, and influence of external electric field. The results showed that the performance of the quinoxaline sensitizer was deteriorated by gradually increasing the steric hindrance to auxiliary donors. The optical properties of the hybridization of cir-coronene graphene quantum dot (GR) with the three dyes have been revealed, and the results show that graphene quantum dots can indeed improve the optical properties of solar cells. In addition, nine new molecules were designed by inserting six functional groups; it is found that inserting -CN in the acceptor part of the molecular structure is beneficial to the performance of the sensitizer.

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“…The efficient conversion of solar energy into electricity through solar cells can effectively alleviate the current energy crisis and environmental problems. − Dye-sensitized solar cells (DSSCs) developed rapidly in the last three decades, relying on their unique advantages such as low fabrication cost and high power conversion efficiency (PCE). − Sensitizers, as a vital component, basically determine the performance of DSSCs in light-harvesting and energy conversion. − Ruthenium complex dyes and zinc porphyrin dyes exhibit a superior photovoltaic performance due to the broad absorption characteristics in the visible region. − With a view to the deficiency of ruthenium and the difficulty of purifying the porphyrin sensitizer, in recent decades, metal-free photosensitizers have motivated the interest of researchers because of the characteristics of sufficient raw materials, cost effectiveness, and flexible structural modification. − …”

Section: Introductionmentioning

confidence: 99%

Effect of the Spatial Configuration of Donors on the Photovoltaic Performance of Double D−π–A Organic Dyes

Zhou¹,

Liang²,

Lin³

et al. 2021

ACS Appl. Mater. Interfaces

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Three double D−π−A sensitizers (A1, A3, and A5) containing different donors (triphenylamine, methoxy-modified triphenylamine, and cyclic thiourea-functionalized triphenylamine) are synthesized to investigate the role of different donors in dyesensitized solar cells (DSSCs). Detailed investigations of the sensitizers reveal that the spatial characteristics of donor units have a considerable impact on the light-harvesting, electrochemistry, and photovoltaic properties. Benefiting from the strong shielding ability of alkyl chains in the donor to its branch chains as observed in density functional theory (DFT), the open-circuit voltage (V OC = 712.0 mV) of A5-based DSSC is higher than those of A1 and A3 by 90 and 78 mV, respectively. Therefore, the A5-based DSSC delivers a good efficiency of 8.54%, relying on its effective suppression of interfacial recombination. The results indicate that the judiciously tailored donor unit is an effective approach to optimize dye configurations to further improve power conversion efficiencies.

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Probing the regeneration process of triphenylamine-based organic dyes in dye-sensitized solar cells

Cited by 24 publications

References 61 publications

Insight into D–A−π–A Structured Sensitizers: A Promising Route to Highly Efficient and Stable Dye-Sensitized Solar Cells

Insight into D–A−π–A Structured Sensitizers: A Promising Route to Highly Efficient and Stable Dye-Sensitized Solar Cells

Enhancing Charge Transfer and Photoelectric Characteristics for Organic Solar Cells

Effect of the Spatial Configuration of Donors on the Photovoltaic Performance of Double D−π–A Organic Dyes

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