Spectroscopic and photoelectric studies of phthalocyanines in polyvinyl alcohol for application in solar energy conversion

Abstract

Abstract. Phthalocyanines are synthetic dyes which are shown to be good photoconverters which can be applied in a photoelectrochemical cell constructed of semiconducting and metallic electrodes. By means of spectroscopic investigation (absorption, fluorescence and photoacoustics) we have followed spectral properties of phthalocyanines complexed with metals dissolved in polyvinyl alcohol solution in order to determine the pathways of deactivation of their excited states. Spectroscopic investigations were accompanied with photovoltaic/photocurrent and current-voltage characteristics of the photoelectrochemical cell with dyes. It has been shown that there is a correlation between dye fluorescence feature and dye ability to electric photoconversion. The comparison of new data for metallic phthalocyanines with those obtained for porphyrins is discussed.

Chemically Amplified Photolithography of a Copolymer Containing Phenolphthalein

“…[9] The dyes in aqueous PVA show similar photocurrent kinetics to those observed for porphyrins and phthalocyanines. [10][11][12] Along with the increasing number of applications for photoactive films, a need has arisen for methods to fabricate devices consisting of functional polymer microstructures that are spatially patterned in the plane of a substrate. Our studies in this field were initiated with a photochemical investigation of t-BOC-protected quinizarin polymer for fluorescent imaging, in which we showed that thin films of t-BOC-protected quinizarin undergo photoinduced deprotection and solubilization upon exposure to UV-vis light.…”

Photovoltage generation and fluorescence of charged tetraphenylporphyrins with dopa melanin

“…The 60 :m sample of dye in PVA was embedded in a sandwich-like construction of semiconducting (In 2 O 3 ) and gold (Au) electrodes [13]. The following measurements were made with the automatic Potentiostat-Galvanostat (Compex, Poland) apparatus: kinetics of photocurrent, current-voltage characteristics.…”

“…In solutions which contain sensitisers, charge separation, electron acceptors and donors or energy transfer within the very short excitation time of the sensitizers occur [6]. In solid devices of organic photovoltaic cells electrical energy can be obtained [10][11][12][13].…”

Characterization and Dielectric Properties of Vacuum Deposited Zinc Phthalocyanine Thin Film

“…10 Among MPcs, zinc phthalocyanine (ZnPc) is an important organic semiconductor with a high absorption coefficient and good photochemical and thermal stabilities, which make it a suitable material for photovoltaic applications, gas sensors and optoelectronic devices. [11][12][13] The high performance of photovoltaic cells can be achieved by using semiconductors which convert sunlight into electricity, conductive oxides or transparent dielectrics as antireflection coatings. A high refractive index is the most common characteristic of these materials.…”