Keywords : Electrochemical deposition

Solar Cell Characteristic Studies on Metal Organic Framework/TiO2 Hybrid Solar Cell

K. Deepak; Sampathrao L. Pinjare

Advanced Materials Letters, 2020, Volume 11, Issue 9, Pages 1-5
DOI: 10.5185/amlett.2020.091555

1,3,5-Triazine-2,4,6-trithiolate (TCA) coordination polymer and TiO2 metal oxide were used to prepare a hybrid solar cell. Electrochemical polymerization of TCA on copper electrode forms CuTCA metal-organic framework (MOF). The CuTCA acts as optically active and hole transport layer whereas TiO2 acts as exciton dissociation surface. The device was characterized under 100 mW/cm 2 condition in Cu/CuTCA-MOF/TiO2/Ag geometry, where copper and silver serve as bottom and top electrodes respectively. The device yield power conversion efficiency (PCE) of 0.196 with open-circuit voltage (Voc), short circuit current (Isc) as 0.161 V and 0.431 mA/cm 2 respectively. The room temperature electrical characterization of CuTCA-MOF reveals its hole mobility (µ), thermally generated hole concentration (no) and resistance as 10.16x10 -3 m 2 /Vs, 8.27x10 18 m -3 and 250 Ω respectively.

Co-Ni Nanowires Arrays with Tunable Properties Obtained by Template Synthesis

Ruxandra Vidu; Andra Mihaela Predescu; Ecaterina Matei; Andrei Berbecaru; Cristian Pantilimon; Claudia Dragan; Mirela Sohaciu; Cristian Predescu

Advanced Materials Letters, 2020, Volume 11, Issue 6, Pages 1-5
DOI: 10.5185/amlett.2020.061524

Co-Ni nanowires arrays were obtained by electrochemical template synthesis in a polycarbonate track etched (PCTE) membrane. To diminish the effects of anomalous deposition observed in the Co-Ni system, the electrochemical deposition was performed from a solution containing nickel and cobalt in an atomic ratio of 3:1. Electrochemical deposition was performed at constant potentials E = -0.8, -0.9, -1.0, -1.1, -1.2 V vs Ag/AgCl for 15 min. The structures were characterized electrochemically via cyclic voltammetry, chronoamperometry, and charge stripping. Co-Ni nanowires were characterized by scanning electron microscopy (SEM/EDAX) to assess the morphology and the composition of the Co-Ni alloy nanowires at different deposition potentials. Electrochemical and structural analysis provided details of their deposition kinetics, structure, and morphology, which would be used to build nanowires array with controlled structure and composition.

Functional Bi Coatings as A Perspective Material for Radiation Shields Production against Electron Radiation

Daria I. Tishkevich; Sergey S. Grabchikov; Stanislav B. Lastovskii; Dzmitry V. Yakimchuk; Denis A. Vinnik; Alla I. Vorobjova; Tatiana I. Zubar; Alex V. Trukhanov

Advanced Materials Letters, 2020, Volume 11, Issue 2, Pages 52-56
DOI: 10.5185/amlett.2020.021479

Currently, medicine uses a large number of devices and sources of ionizing radiation, which have a dangerous effect on workers in medical diagnostic rooms and patients. Human organs are very sensitive to the damaging effects of radiation. The commonly used material for radiation protection proposes is lead. In recent years, bismuth deposition has become an interesting subject for the electrochemical community because of its unique properties. There are a limited number of authors dealing with Bi films onto metallic substrates by electrochemical deposition. The conditions of Bi electrodeposition and the structure of Bi coatings were examined. The shielding efficiency of Bi coatings under electron irradiation with 1,6–1,8 MeV was measured. The electron beam attenuation coefficient was estimated by the changing of current-voltage characteristics of semiconductor test structures which were located with and without shields. It has been determined that optimal shielding efficiency and mass-dimensional parameters have Bi shields with 2 g/cm 2 mass thickness and 156 shielding efficiency.