Optical absorption in metal bisphthalocyanine sublimed films

Ray, A. J.; Exley, James; Ghassemlooy, Zabih; Crowther, David; Ahmet, Mustafa T.; Silver, Jack

doi:10.1016/s0042-207x(00)00420-6

Cited by 10 publications

(4 citation statements)

References 14 publications

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“…Globally, the LuPc 2 -related Q and BV bands energy seems to remain practically unaltered in the MSDI, whereas their relative intensities, regarding those of the phthalocyanine sub-layers, are distinctively distributed. This is a result of the dependence on the number and the orientation of the nearest-neighbor molecules in the film structure, mainly at the organic interface level [65,66]. Thus confirming the eventuality of a template effects from the Cu(F n Pc) sub-layer on the arrangement of LuPc 2 during the initial stages of growth [67,68].…”

Section: Uv-vis Spectroscopymentioning

confidence: 54%

Molecular semiconductor-doped insulator (MSDI) heterojunctions as new transducers for chemical sensors

Bouvet

Parra

Suisse

2011

Eur. Phys. J. Appl. Phys.

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This article describes a new principle of transduction involving an heterojunction between a Molecular Semiconductor and a Doped Insulator (MSDI). Herein, we report on an MSDI-based sensor featuring an heterojunction between a lutetium bisphthalocyanine (LuPc2), which acts as Molecular Semiconductor (MS) and a thin film of Doped Insulator (DI) made of substituted or fluorinated copper phthalocyanine (CuFnPc, where n = 0, 8, 16). Previously, we reported the peculiar effect of the heterojunction on the MSDI's electronic behavior, suggesting this device as a new kind of transducer for gas chemosensing. Indeed, of particular significance was the key role of modulator played by the nature of the doped insulator sub-layer. While the MS thin film remains the only layer of the sensor exposed to gas atmosphere, the DI's ability to tune the electronic characteristics of the organic heterojunction allows it to drastically affect the nature of the effective charge carriers. In particular, an increase in fluorination of the doped insulator can cause an inversion of the LuPc 2 response toward electron accepting (ozone, ppb level) or donating (ammonia, ppm level) gases. The present work focuses on the structural, electronic and electrical properties of the MSDI heterojunction, which have been studied by UV-vis spectroscopy, atomic force microscopy, current-voltage measurements and chemical doping, in order to shed some light on this phenomenon. The unique ambipolar nature of LuPc 2 is suggested to be the main property responsible for the MSDI's unique behavior.

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Section: Uv-vis Spectroscopymentioning

confidence: 54%

Molecular semiconductor-doped insulator (MSDI) heterojunctions as new transducers for chemical sensors

Bouvet

Parra

Suisse

2011

Eur. Phys. J. Appl. Phys.

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“…As far as the present phthalocyanine metals are concerned, the photoelectric response of the most materials just localized in visible light or short wavelength infrared light, which restricts the application of phthalocyanine metals as the detector materials in infrared optoelectronic field. Expanding the response band of organic infrared semiconductor towards the longer wavelength is an important research direction, sandwich-like phthalocyanine rare earths have an absorption in infrared band, many researches on the preparations and properties of phthalocyanine rare earths have been carried out [7][8][9][10][11][12][13] , however, most of these researches are concentrated on the preparation methods [7] , electrochromic properties [8] , optical properties [9][10][11] , electrochemical properties [12] and gas sensing detectors [13] .…”

Section: Introductionmentioning

confidence: 99%

The preparation of organic infrared semiconductor phthalocyanine gadolinium (III) and its optical and structural characterizations

Tang

Song

et al. 2009

SPIE Proceedings

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In order to increase the species of organic infrared semiconductor, we synthesized organic infrared semiconductor phthalocyanine gadolinium by using o-phthalodinitrile and GdCl 3 as reactants, ammonium molybdate as catalyzer. Under light and dark field modes of microscope, the translucency emerald-like powder of phthalocyanine gadolinium has been observed, the size of the small grain for the sample is around 5µm in diameter, the size of larger grain may reach to several tens of microns. The main vibrational peaks in FT-IR spectrum and Raman spectrum have been assigned. Elementary analysis shows that the experimental data of phthalocyanine gadolinium in the main agree with those of calculated data. The UV-Vis absorption spectrum of the sample indicates the sandwich-like structure of phthalocyanine gadolinium. The organic infrared semiconductor phthalocyanine gadolinium thin film on quartz substrate has been prepared with our synthesized powdered sample by using solution method. The characterizations of XRD and UV-Vis-NIR absorption have been carried out for the phthalocyanine gadolinium thin film on quartz substrate, XRD shows that phthalocyanine gadolinium diffractions occur at 2θ=6.851,8.290 and 8.820 degrees, the corresponding plane spacings (d) for the diffraction peaks are 12.8921、10.6570 and 10.0176Å.The diffraction peaks locate at low diffraction angle, suggesting that the molecular size of the phthalocyanine gadolinium is big that causes the large spacing of crystal planes. The UV-Vis-NIR absorption of phthalocyanine gadolinium thin film on quartz substrate implies that within near infrared band there is a absorption in the 1.3～2.0µm wavelength range peaked at ca. 1.75µm, indicating the important potential application value of phthalocyanine gadolinium in the field of organic infrared optoelectronics.

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“…The typical methods used to fabricate bisphthalocyanine films include vacuum deposition, Langmuir-Blodgett (LB) technique and molecular beam epitaxy, etc. [14][15][16]. Compared with the mentioned fabrication methods for Pcs films, which are accomplished at high cost and long time because of their poor solubility in aqueous and organic solvents, the electrophoretic deposition (EPD) technique proved to be an alternative way with low cost and short time.…”

Section: Introductionmentioning

confidence: 99%

Formation and characterization of europium bisphthalocyanine nanowires by electrophoretic deposition

Bai

Chen

Zhou

et al. 2005

Journal of Crystal Growth

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Optical absorption in metal bisphthalocyanine sublimed films

Cited by 10 publications

References 14 publications

Molecular semiconductor-doped insulator (MSDI) heterojunctions as new transducers for chemical sensors

Molecular semiconductor-doped insulator (MSDI) heterojunctions as new transducers for chemical sensors

The preparation of organic infrared semiconductor phthalocyanine gadolinium (III) and its optical and structural characterizations

Formation and characterization of europium bisphthalocyanine nanowires by electrophoretic deposition

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