Cellules photoélectrochimiques de phtalocyanine d'hydroxyaluminium déposées par rotation

Abstract

Des cellules photoClectrochimiques a base de phtalocyanine d'hydroxyaluminium (PcAIOH) ont Ct C fabriqukes par la mCthode de dCposition par rotation ((<spin-coating,,). Le comportement spectral et electrique des cellules NESA/PcAIOH/BQ/HQ/Pt est CtudiC et comparC a celui de cellules ou les films de PcAlOH sont produits par sublimation. A cause de la faible solubilitC de PcAlOH dans les solvants organiques volatils, le DMSO utilisC pour la dCposition par rotation semble rester piCgC dans le film solide et diminue le rendement de la cellule photoClectrochimique. L'Ctude de l'influence de la contre-Clectrode sur l'efficacite des cellules a permis de montrer qu'une contre-electrode en vanadium conduisait a des valeurs plus ClevCes de J,, , V,,, et q comparee a une contre-electrode en platine, mais prCsentait des phCnomknes de corrosion. GBRARD PERRIER and L t H. DAO. Can. J. Chem. 64, 2431 (1986). The spin-coating technique was used to produce hydroxyaluminum phthalocyanine (PcAlOH) photoelectrochemical cells. The spectral and electrical behavior of NESA/PcAIOH/BQ/HQ/Pt cells is studied and comparisons are made with cells based upon sublimed PcAlOH films. Due to the weak solubility of PcAlOH in volatile organic solvents, the DMSO used in the spin-coating method seems to be trapped in the solid film, and leads to a decrease in the photoelectrochemical cell efficiency. Studies on the influence of the counter-electrode showed that a vanadium counter-electrode gave higher values of Js,, V,, , and q than a platinum one, but corrision phenomena were observed in that case.

A new form of hydroxyaluminum phthalocyanine by acid treatment. Characterization and photoactivity

“…The film thickness was determined by electronic absorption spectra and referred to a standard curve obtained by profilometry with a Sloan Dektak 11. The film thickness was controlled in the range of 50-5000 A (16). For the organic solvent treatment, thin films on glass plates were placed in the vapors of the liquids held at 60°C or directly dipped in the liquids for a few minutes at room temperature.…”

“…Heterojunction photovoltaic cells of the type ZnO or CdS/Pc were shown to have efficiencies as high as 0.22% under AM2 illumination of 75 mW cmV2 (1 1-14). Phthalocyanines have also been studied in photoelectrochemical cells (15)(16)(17) and efficiencies of up to 7 X % have been reported for x-PC under white light irradiation (75 mW ~r n -~) (18).…”

Conductive polymeric Cu(II) tetrakis(3‐methoxy‐4‐hydroxyphenyl) porphyrin as a photosensitizer in a photoelectrochemical Cell

“…The photocurrent plateau reflects light intensity-limited current. For low intensity monochromatic light, the quantum yield, 4, defined as electrons produced per photon absorbed, was calculated based on Equation 2, [16] where 4, is the short current circuit, hv is the photon energy, y is a unit charge, and I is the light power incident on 1 cm2 of surface. The quantum yield calculated for monochromatic light (440 nm, 0.01 mW/cmz) and J,, = 0.2 pA/cm2 is 18.3% and with correction for reflected light 21.6%.…”

Photoelectrochemical behavior of a hydroxyaluminum phthalocyanine polyvinylpyridine–iodine electrode

“…All action spectra were computed for the same photon flux incident on the film at each wavelength (Nma = 2.7 x 1014 photons cmP2 s-') taking into account the measured light exponent, y, a t these energies. 18,19 The light intensity was measured using a United Detector Technology 21A powermeter equipped with a radiometric filter. All electrical measurements were performed in a Faraday cage.…”