Summary It is shown how the well-known photoeffects observed at semiconductor electrodes can be used to construct an electrochemical photocell. The photovoltaic effects in such cells are based on the formation of a Schottky barrier at the interface between a semiconductor and a suitable redox electrolyte. A cell design is developed and some results with CdS, CdSe or GaP electrodes are presented. The characteristics of such photocells and the problems involved in their application as solar cells are discussed.

Electrochemical Solar Cells are Schottky Barrier Devices. A Citation-Classic Commentary on Electrochemical photo and solar cells: Principles and some experiments

Formation of ZnSe on Ag(111) by electrochemical atomic layer epitaxy

Membrane potential studies on cholesterol liquid membranes

Studies on electrochemical characterization of ion selective cellulose acetate membranes with and without a lecithin liquid membrane

Lead chalcogenides (PbS, PbSe, PbTe) are narrow band gap semiconductors which are largely used in infrared applications. In the present study lead chalcogenide thin films were deposited electrochemically from aqueous solutions. Two different electrodeposition methods were used; PbSe and PbTe thin films were prepared at constant potential while PbS was deposited by cycling the potential. Chemical and physical properties of the films were examined by various techniques, and their electrical properties were studied as well. PbSe and PbS thin films were found to be stoichiometric whereas PbTe thin films contained an excess of Te. The films contained water as an impurity. All the films had polycrystalline, randomly oriented cubic structure. After annealing the films showed p-type conductivity. The annealing at 100 °C did not affect much the resistivities of PbS and PbTe which remained between 0.5–10 Ω cm but the resistivity of PbSe films increased to 1–60 kΩ cm. All films showed IR activity. Electrodeposition mechanisms of PbSe, PbTe and PbS thin films and electrochemistry of the related precursors were studied by means of the electrochemical quartz crystal microbalance (EQCM) combined with cyclic voltammetry. Both film growth and EQCM studies showed that the electrodeposition of PbSe and PbTe occurs by the induced codeposition mechanism, where Se (or Te) is deposited first and induces the reduction of lead ions to form PbSe (or PbTe) so that this occurs at more positive potential than where lead alone would be deposited. Electrodeposition of PbS, on the other hand, turned out to be complicated including several simultaneous processes.

Electrodeposition of PbS, PbSe and PbTe thin films: Dissertation

Preparation d'electrodes de seleniure de zinc de composition variable presentant une conductivite de type p par depot electrolytique a courant limite. Associees a des semi-conducteurs de type n ces electrodes constituent des cellules photoelectrochimiques

Electrosynthesis of polycrystalline photoelectroactive p-zinc selenide

The photoelectroactivity of polycrystalline zinc selenide films prepared by electrochemical codeposition in zinc sulphate solutions of different concentrations containing the l−/l2 redox couple has been investigated. Measured photopotentials, photocurrents and the initial rate of build-up of photopotentials indicate a significant enhancement in photoelectro-convertibility with increase in concentration, in spite of practically no change in the flat band potentials. The photoelectroactivity of a p-n heterojunction photoelectrochemical cell using cadmium selenide along with zinc selenide has also been studied.

Photoelectric conversion studies on zinc selenide

... (I) Inorganic ion exchange membranes are of considerable interest because of their attractive electrochemical characteristics and ability to withstand impairment in functional activity at elevated temperatures and hostile environments1•2• There is need to prepare and characterize inorganic ion exchange membranes to explore the possibilities of their use in accomplishing separations of practical importance and as ion selective electrodes. We have presently prepared an anion exchange alumina membrane supported on polyvinylidene fluoride matrix, and measured its membrane potential to derive transport numbers, permselectivities and fixed charge densities using sodium chloride, barium chloride and aluminium chloride solutions. It has been observed that polyvinylidene fluoride itself is not ion selective. Incorporation of alumina on a polyvinylidene fluoride matrix is essential for ion selectivity.

http://nopr.niscair.res.in/bitstream/123456789/48775/1/IJCA%2024A%2810%29%20825-827.pdf

Studies on Electroactivity of Anion Exchange Alumina Membrane Supported on a Polyvinylidene Fluoride Matrix

The photoelectroactivity of polycrystalline zinc selenide films prepared by electrochemical codeposition in zinc sulphate solutions of different concentrations containing theI
 −/I
 2 redox couple has been investigated. Measured photopotentials, photocurrents and the initial rate of build-up of photopotentials indicate a significant enhancement in photoelectro-convertibility with increase in concentration, in spite of practically no change in the flat band potentials. The photoelectroactivity of ap-n heterojunction photoelectrochemical cell using cadmium selenide along with zinc selenide has also been studied.

/pdf/electrosynthesis-and-photoelectroactivity-of-2blenonsr6.pdf

Electrosynthesis and photoelectroactivity of polycrystallinep-zinc selenide

The experiment on cauliflower cv. PUSHI was carried out to find out the correlation and multiple regression co-efficients among different characters. Yield was found to be highly significantly and positively correlated with all the ancillary characters viz., curd depth (0.9183), curd diameter (0.9053), weight of curd (0.8991), plant height (0.8897), weight of plant (0.8738) and plant girth (0.6861) the multiple regression co-efficients were found to be non significant due to multi collinearly between the characters. The step wise regression analysis showed that curd depths have highest contribution towards field followed by curd weight, curd diameter and plant height while the lowest contribution was due to plant girth and weight of plant.

/pdf/correlation-and-multiple-regression-studies-in-cauliflower-3h6q0p4n2t.pdf

J. P. Rai

Papers

Electrosynthesis of polycrystalline photoelectroactive p-zinc selenide

Photoelectric conversion studies on zinc selenide

Studies on Electroactivity of Anion Exchange Alumina Membrane Supported on a Polyvinylidene Fluoride Matrix

Electrosynthesis and photoelectroactivity of polycrystallinep-zinc selenide

Correlation and multiple regression studies in cauliflower (Brassica oleracea var. botrytis L.)