Glass-sandwich-type organic solar cells utilizing liquid crystalline phthalocyanine

Usui, Toshiki; Nakata, Yuki; Banoukepa, Gilles de Roméo; Fujita, Katsuhide; Shimizu, Yo; Fujii, Akihiko

doi:10.7567/apex.10.021602

Cited by 9 publications

(12 citation statements)

References 29 publications

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“…A sandwich-cell-type device is mainly utilized in TOF measurement for columnar LC materials, and the column axis of C6PcH 2 is reported to be tilted from the normal direction to the substrate. 26 In contrast, the column axis direction in spin-coated C6PcH 2 films is reported to be exactly parallel to the substrate. 6 Thus, the carrier mobility in the intercolumn direction can be evaluated by the photo-CELIV technique using a bilayer structure, which should provide important information on the ambipolar carrier transport in thin films.…”

Section: Theoretical Analysismentioning

confidence: 98%

Evaluation of ambipolar carrier mobility in alkyl-substituted phthalocyanine thin film

2018

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Ambipolar carrier mobility in a thin film of hexyl-substituted phthalocyanine (C6PcH 2 ), which is a promising donor material for solution-processed organic thin-film solar cells, has been studied by measuring photogenerated charge carriers extracted under a linearly increasing voltage. As the extraction transient current of the C6PcH 2 thin film could not be observed in a conventional device structure composed of a single organic layer, an evaporated layer of C 60 or pentacene was introduced as a charge-separation layer to determine the hole or electron mobility, respectively. An extraction transient current clearly appeared owing to the efficient photo-induced charge generation at the interface between the C6PcH 2 and chargeseparation layers. The hole and electron mobilities were evaluated by a proposed analytical model, which took into account the carrier generation at the interface and the carrier diffusion during the delay time.

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Section: Theoretical Analysismentioning

confidence: 98%

Evaluation of ambipolar carrier mobility in alkyl-substituted phthalocyanine thin film

2018

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“…Organic solar cells (OSCs) have received much attention in recent years because of the diversity and potential of practical applications . However, the performance, especially the power conversion efficiency (PCE), of OSCs is much lower than that of inorganic solar cells .…”

Section: The Parameters Of Calculation (“Device 1” Represents the Parmentioning

confidence: 99%

Unified Model for Exciton Diffusion and Dissociation in Organic Solar Cells

Xiong

Sun

et al. 2019

Physica Rapid Research Ltrs

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The performance of organic solar cells is limited by the exciton. However, the theoretical model to study the nature of the exciton is separated into exciton diffusion and dissociation. This article proposes a unified model by combining both exciton diffusion and dissociation. This model can be reduced to the classical model of exciton diffusion or dissociation. Moreover, this model quantitatively explains meaningful experimental data of the short‐circuit current characteristic at different active layer thicknesses that cannot be fitted by the two classical models. In sum, this model is useful for researching the mechanism of the exciton in thin organic materials, which make some significant contributions to blend, multilayer, and A–D–A small‐molecule acceptor solar cells.

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“…Phthalocyanines are the most widely studied porphyrazines and have been extensively investigated for materials science and biomedical applications, 1,2 including magnetooptic devices, 3 LCD displays, 4 printers, 5 inks, 6 solar cells, and photodynamic therapy (PDT). [7][8][9] Furthermore, phthalocyanine double-decker complexes with a lanthanide as the central metal are attracting attention as nextgeneration magnetic materials such as single-molecule magnets (SMMs). [10][11][12][13] Magnetic circular dichroism (MCD) and magnetic circularly polarized luminescence (MCPL) spectroscopy combined with absorption and fluorescence spectroscopy are methods to investigate the electronic structure and angular momentum of highly symmetric molecules with photophysical properties, such as phthalocyanines and porphyrins.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electronic structure analysis of phthalocyanine complexes using magnetic circular dichroism and magnetic circularly polarized luminescence spectroscopy

Suzuki,

Santria,

Oyama

et al. 2023

Chirality

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In the study of phthalocyanine complexes using magnetic circular dichroism (MCD) spectroscopy, the electronic structure of excited states is generally discussed based on the rigid‐shift approximation, in which the band profiles for left‐handed circularly polarized (lcp) and right‐handed circularly polarized (rcp) light are assumed to be the same. This assumption may not necessarily be valid for cases where there are multiple initial states having different geometries. Magnetic circularly polarized luminescence (MCPL) from phthalocyanine complexes can be regarded as an example of such cases, since the two degenerate emission states are split in a magnetic field and can undergo a structural deformation. Here, we investigated an alternative approach, where the lcp and rcp components are independently determined. This method, which we refer to as the direct‐separation approach, allows direct determination of the distribution of the two emission states as well as the orbital angular momentum . Using this approach, and the distribution were determined from MCD and MCPL spectra of a series of phthalocyanine complexes. Comparison of the two methods shows that the rigid‐shift and the direct‐separation approaches give practically equivalent results for the systems under study, but the latter is advantageous for systems where the former is not applicable.

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Glass-sandwich-type organic solar cells utilizing liquid crystalline phthalocyanine

Cited by 9 publications

References 29 publications

Evaluation of ambipolar carrier mobility in alkyl-substituted phthalocyanine thin film

Evaluation of ambipolar carrier mobility in alkyl-substituted phthalocyanine thin film

Unified Model for Exciton Diffusion and Dissociation in Organic Solar Cells

Electronic structure analysis of phthalocyanine complexes using magnetic circular dichroism and magnetic circularly polarized luminescence spectroscopy

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