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Wang, Xiaofeng; Zhan, Conghong; Maoka, Takashi; Wada, Yuji; Koyama, Yasushi

doi:10.1016/j.cplett.2007.08.097

Cited by 82 publications

(14 citation statements)

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“…(6) The effects of the central metal in this methylphenyl−carboxyphenyl porphyrin on the photocurrent generation were examined: The photocurrent yield, that is, the charge-injection yield (Φ inj ) multiplied by the charge-collection efficiency (η c ), increased when the one electron-oxidation potential ( E ox ) was increased, which was ascribed to the suppression of the reverse electron transfer from TiO 2 to the porphyrin sensitizer. (7) Most recently, a DSSC that we fabricated by the use of Chl c 2 exhibited a performance, that is, J sc = 13.7 mA·cm -2 , V oc = 0.57 V, and η = 4.6% . (8) Dr. Nazeeruddin tested our Phe a sensitizer that is used in the present investigation and obtained J sc = 14.4 mA·cm -2 , V oc = 0.5 V, and η = 5.1% (personal communication); the performance of this pheophorbide sensitizer is much higher than that of DSSC we fabricated (3.1%); the conversion efficiency (η = 5.1%) is approaching the best porphyrin sensitizer mentioned above (η = 5.6%) …”

Section: Introductionmentioning

confidence: 67%

“…This is in a series of investigations to develop Grätzel-type dye-sensitized solar cells (DSSCs) using chlorophylls (Chls) and their derivatives. − In the photosynthetic systems, Chls initiate electron-transfer reactions along the redox components in the photoreaction center following charge separation at the special pair. Also, Chls play the light-harvesting function, which includes the absorption of light energy followed by singlet-energy transfer from the antenna complexes eventually to the photoreaction center.…”

Section: Introductionmentioning

confidence: 99%

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Dependence of Photocurrent and Conversion Efficiency of Titania-Based Solar Cell on the Q_y Absorption and One Electron-Oxidation Potential of Pheophorbide Sensitizer

et al. 2008

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Titania-based solar cells were fabricated by the use of six pheophorbide sensitizers having bacteriochlorin, chlorin, and porphyrin macrocycles, to which the carboxyl or allylcarboxyl group is directly attached for binding and electron injection to TiO2. Because of structural similarity, these sensitizers are expected to have similar physical properties except for electronic-absorption and redox properties: Concerning the former, the state energies, molar extinction coefficients (ε), oscillator strengths ( f ), and transition-dipole moments (μ) of the Soret and Q y absorptions were determined, whereas concerning the latter, one electron-oxidation potential (E ox). Alternatively, the performance of pheophorbide-sensitized solar cells, including the incident photon-to-current conversion efficiency (IPCE), short-circuit current density (J sc), open-circuit voltage (V oc), and solar energy-to-electricity conversion efficiency (η) was determined. It was found that the J sc and η values increased with the increasing Q y absorption and with the decreasing one electron-oxidation potential (in other words, with the increasing electron-ejection potential). To explain the clear and strong dependence, we built possible models for the pheophorbide-to-TiO2 electron injection and tried to fit the J sc value in terms of the Q y absorption and the E ox value by the use of empirical equations. After a number of fitting trials, two successful models of reasonable fitting emerged: One, a model of parallel electron injection, that is, electron injection upon Q y excitation and redox electron transfer in the ground state, and the other, a model of electron injection simply via the excited state, in which both the Q y absorption and the Q y -state one electron-oxidation potential can contribute. These models as well as the future strategies in revealing the real mechanism of electron injection are discussed.

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Section: Introductionmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Dependence of Photocurrent and Conversion Efficiency of Titania-Based Solar Cell on the Q_y Absorption and One Electron-Oxidation Potential of Pheophorbide Sensitizer

et al. 2008

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“…[4][5][6][7][8] Chlorophylls (Chls), which are the most abundant natural pigments, play key roles in early photophysical and -chemical events in naturalp hotosynthesis. [9] In the last decade, we have carried out as eries of investigationst oe xplore the possibility of employing Chls and their derivatives in emerging photovoltaic techniques, such as biomimetic systems, [10][11][12][13] DSSCs, [14][15][16][17][18][19][20][21][22][23][24][25][26][27] organic solar cells (OSCs), [28][29][30][31] and perovskite solar cells (PSCs). [32] These investigations are purely based on the fact that Chls are the only naturallyo ccurringo rganic semiconductors that possess the merits of large-scale resources,p ollution free, and optoelectrical variability.…”

Section: Introductionmentioning

confidence: 99%

Chlorophyll‐Based Organic–Inorganic Heterojunction Solar Cells

Zhao

et al. 2017

Chemistry A European J

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Solid-state chlorophyll solar cells (CSCs) employing a carboxylated chlorophyll derivative, methyl trans-3 -carboxypyropheophorbide a, as a light-harvesting dye sensitizer chlorophyll (DSC) deposited on mesoporous TiO , on which four zinc hydroxylated chlorophyll derivatives were spin-coated for hole transporter chlorophylls (HTCs), are described. Key parameters, including the effective carrier mobility of the HTC films, as determined by the space charge-limited current method, and the frontier molecular orbitals of these DSCs and HTCs, as estimated from cyclic voltammetry and electronic absorption spectra, suggest that both charge separation and carrier transport are favorable. The power conversion efficiencies (PCEs) of the present CSCs with fluorine-doped tin oxide (FTO)/TiO /DSC/HTCs/Ag were determined to follow the order of HTC-1>HTC-2>HTC-3>HTC-4, which coincided perfectly with the order of their hole mobilities. The maximum PCE achieved was 0.86 % with HTC-1. The photovoltaic devices studied herein with two types of chlorophyll derivatives as dye sensitizers and hole transporters provide a unique solution for the utilization of solar energy with a view to truly realizing "green energy".

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“…Wang et al [47] have extracted chlorophyll dyes from brown seaweed, U. pinnatifida. They examined two different types of chlorophyll and their oxidized forms.…”

Section: Chlorophyllmentioning

confidence: 99%

Dye Photosensitizers and Their Influence on DSSC Efficiency: A Review

Krawczak

2019

IAPGOS

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Since early 1990s dye-sensitized solar cells (DSSC) has been developed by many research groups all over the World. This paper presents a review of researches focusing on photosensitizer influence on DSSC efficiency. Variety of dye substance has been analyzed. The highest efficiency around 11.2% has been noted for ruthenium-based DSSC devices. Natural dyes allowed to reach 4.6%. The most metal-free organic dyes resulted in efficiency ranged from 5% to 9%, however, some of them (e.g. Y123) allowed to obtain devices with efficiencies equal to 10.3%. Co-sensitization is the new approach which results in efficiencies up to 14.3%.

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Fabrication of dye-sensitized solar cells using chlorophylls c1 and c2 and their oxidized forms c1′ and

Cited by 82 publications

References 7 publications

Dependence of Photocurrent and Conversion Efficiency of Titania-Based Solar Cell on the Q_y Absorption and One Electron-Oxidation Potential of Pheophorbide Sensitizer

Dependence of Photocurrent and Conversion Efficiency of Titania-Based Solar Cell on the Q_y Absorption and One Electron-Oxidation Potential of Pheophorbide Sensitizer

Chlorophyll‐Based Organic–Inorganic Heterojunction Solar Cells

Dye Photosensitizers and Their Influence on DSSC Efficiency: A Review

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Fabrication of dye-sensitized solar cells using chlorophylls c1 and c2 and their oxidized forms c1′ and

Cited by 82 publications

References 7 publications

Dependence of Photocurrent and Conversion Efficiency of Titania-Based Solar Cell on the Qy Absorption and One Electron-Oxidation Potential of Pheophorbide Sensitizer

Dependence of Photocurrent and Conversion Efficiency of Titania-Based Solar Cell on the Qy Absorption and One Electron-Oxidation Potential of Pheophorbide Sensitizer

Chlorophyll‐Based Organic–Inorganic Heterojunction Solar Cells

Dye Photosensitizers and Their Influence on DSSC Efficiency: A Review

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Dependence of Photocurrent and Conversion Efficiency of Titania-Based Solar Cell on the Q_y Absorption and One Electron-Oxidation Potential of Pheophorbide Sensitizer

Dependence of Photocurrent and Conversion Efficiency of Titania-Based Solar Cell on the Q_y Absorption and One Electron-Oxidation Potential of Pheophorbide Sensitizer