Phthalocyanine/C60 composites as improved photosensitive materials

Morenzin, J.; Schlebusch, C.; Keßler, Barbara; Eberhardt, W.

doi:10.1039/a808599d

Cited by 12 publications

(9 citation statements)

References 9 publications

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“…This spatial separation prevents direct electron-hole recombination. Studies by photoelectron spectroscopy (PES) have shown that the charge transfer process is energetically possible, both in layered systems [4,5] as well as in heterogeneous mixtures [10]. Here, we concentrate on the material combination of the organic photoreceptor copper phthalocyanine (CuPC), which is a ubiquitous component of photochemical and light harvesting applications [1][2][3], with C 60 molecules as electron acceptors.A recent report on CuPC-C 60 interfaces indicates that, when CuPC is deposited atop of a C 60 film, the sample surface tends to charge up, unlike the case of a C 60 film grown on top of a CuPC covered substrate [7].…”

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confidence: 99%

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confidence: 99%

“…Consequently, many research efforts focus on the identification of methods to quench the recombination process. Empirically, the admixture of C 60 into organic photoreceptor films has led to significant progress in this respect [1][2][3][4][5][6][7][8]. Based on observations of intrinsic fluorescence quenching [1,2] as well as from photoemission studies of the band alignment in thin film systems [9], it has been concluded that after the initial electron-hole production in the chromophore, the electron is captured by the C 60 molecule, thus spatially separating the electron from the hole in the chromophore molecule.…”

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Site-specific probing of charge transfer dynamics in organic photovoltaics

Arion

Neppl

Roth

et al. 2015

Applied Physics Letters

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We report the site-specific probing of charge-transfer dynamics in a prototype system for organic photovoltaics (OPV) by picosecond time-resolved X-ray photoelectron spectroscopy. A layered system consisting of approximately two monolayers of C60 deposited on top of a thin film of CopperPhthalocyanine (CuPC) is excited by an optical pump pulse and the induced electronic dynamics are probed with 590 eV X-ray pulses. Charge transfer from the electron donor (CuPC) to the acceptor (C60) and subsequent charge carrier dynamics are monitored by recording the time-dependent C 1s core level photoemission spectrum of the system. The arrival of electrons in the C60 layer is readily observed as a completely reversible, transient shift of the C60 associated C 1s core level, while the C 1s level of the CuPC remains unchanged. The capability to probe charge transfer and recombination dynamics in OPV assemblies directly in the time domain and from the perspective of well-defined domains is expected to open additional pathways to better understand and optimize the performance of this emerging technology.PACS numbers: 88.40.jr,79.60.-i,78.47.da, 78.20.-e Research on materials for organic photovoltaic (OPV) applications is driven mostly by two figures of merit: the light-to-current conversion efficiency and the cost of production, which would make the technology suitable for widespread implementation. So far, OPVs meet the second criterion, as they can easily be prepared by deposition from solutions, or by low-cost printing techniques, rather than using more demanding vacuum deposition methods. However, the relatively low conversion efficiency of OPVs remains a significant challenge. It is generally accepted that recombination of the photo-induced electron-hole pair or excitonic state in the photoreceptive material is one of the major loss mechanisms. Consequently, many research efforts focus on the identification of methods to quench the recombination process. Empirically, the admixture of C 60 into organic photoreceptor films has led to significant progress in this respect [1][2][3][4][5][6][7][8]. Based on observations of intrinsic fluorescence quenching [1, 2] as well as from photoemission studies of the band alignment in thin film systems [9], it has been concluded that after the initial electron-hole production in the chromophore, the electron is captured by the C 60 molecule, thus spatially separating the electron from the hole in the chromophore molecule. This spatial separation prevents direct electron-hole recombination. Studies by photoelectron spectroscopy (PES) have shown that the charge transfer process is energetically possible, both in layered systems [4,5] as well as in heterogeneous mixtures [10]. Here, we concentrate on the material combination of the organic photoreceptor copper phthalocyanine (CuPC), which is a ubiquitous component of photochemical and light harvesting applications [1][2][3], with C 60 molecules as electron acceptors.A recent report on CuPC-C 60 interfaces indicates that, when CuPC is depos...

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Site-specific probing of charge transfer dynamics in organic photovoltaics

Arion

Neppl

Roth

et al. 2015

Applied Physics Letters

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“…1). Studies by photoelectron spectroscopy have shown that the charge transfer process is energetically possible, both in layered systems [16,17] as well as in heterogeneous mixtures [18]. The current state of knowledge about these systems and their role in organic photovoltaic devices has been summarized recently [19,20].…”

Section: Introductionmentioning

confidence: 99%

Electronic properties of Mn-phthalocyanine–C60 bulk heterojunctions: Combining photoemission and electron energy-loss spectroscopy

Roth

Herzig²,

Lupulescu

et al. 2015

Journal of Applied Physics

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The electronic properties of co-evaporated mixtures (blends) of manganese phthalocyanine and the fullerene C60 (MnPc : C60) have been studied as a function of the concentration of the two constituents using two supplementary electron spectroscopic methods, photoemission spectroscopy (PES) as well as electron energy-loss spectroscopy (EELS) in transmission. Our PES measurements provide a detailed picture of the electronic structure measured with different excitation energies as well as different mixing ratios between MnPc and C60. Besides a relative energy shift, the occupied electronic states of the two materials remain essentially unchanged. The observed energy level alignment is different compared to that of the related CuPc : C60 bulk heterojunction. Moreover, the results from our EELS investigations show that despite of the rather small interface interaction the MnPc related electronic excitation spectrum changes significantly by admixing C60 to MnPc thin films. arXiv:1511.00809v1 [cond-mat.mtrl-sci] 3 Nov 2015

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“…It has been reported that the photosensitivity of ZnPc in a polymeric binder is increased by the admixture of C 60 [15]. From photoemission experiments, C 60 and C 70 are expected to be appropriate electron-accepting materials when they are brought into contact with Pcs in solids [16].…”

Section: Introductionmentioning

confidence: 99%

Photoinduced electron transfer from triplet states of phthalocyanines to fullerenes studied by transient absorption spectroscopies in visible and near-IR regions

Elkhouly

Islam

Fujitsuka

et al. 2000

J. Porphyrins Phthalocyanines

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Photoinduced electron transfer processes between C 60/ C 70 and phthalocyanines such as tetra-tert-butylphthalocyanine ( H 2 TBPc ) and its zinc derivative ( ZnTBPc ) in polar solvents have been studied by observing the transient absorption spectra in the visible and near-IR regions. Upon predominant excitation of TBPcs with a 670 nm laser pulse in polar solvents, growth of the transient absorption bands of [Formula: see text] and [Formula: see text] was observed, accompanied by a concurrent decay of the triplet states of TBPcs (3 TBPc *). Thus it is confirmed that electron transfer occurs via 3 TBPc * in polar solvents. The electron transfer rate constants and efficiencies of electron transfer via 3 ZnTBPc * are greater than those via 3 H 2 TBPc * owing to the electron ejection ability of 3 ZnTBPc *. Solvent effects on the forward and backward electron transfer processes have been evaluated.

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Phthalocyanine/C60 composites as improved photosensitive materials

Cited by 12 publications

References 9 publications

Site-specific probing of charge transfer dynamics in organic photovoltaics

Site-specific probing of charge transfer dynamics in organic photovoltaics

Electronic properties of Mn-phthalocyanine–C60 bulk heterojunctions: Combining photoemission and electron energy-loss spectroscopy

Photoinduced electron transfer from triplet states of phthalocyanines to fullerenes studied by transient absorption spectroscopies in visible and near-IR regions

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