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Cho S.K.,Seoul National University | Cho S.K.,Center for Electrochemistry | Kim M.J.,Seoul National University | Kim J.J.,Seoul National University
Electrochemical and Solid-State Letters | Year: 2011

We evaluated the characteristics of methanesulfonic acid (MSA) as a supporting electrolyte in copper electroplating in terms of copper ion solubility, i-V behavior, and compatibility with additives for copper filling. Although the solubility of copper ion in MSA is higher than that in sulfuric acid, linear sweep voltametry analysis showed that the current density from MSA electrolyte was lower than that from sulfuric acid, due to its high solution resistance. Additives in MSA electrolyte behaved in the same way as in sulfuric acid, and the complete filling of damascene trenches and through silicon vias (TSVs) were obtained with PEG-Cl-SPS additives. © 2011 The Electrochemical Society. All rights reserved.

Hsu H.-Y.,Center for Electrochemistry | Ji L.,Center for Electrochemistry | Ji L.,University of Texas at Austin | Ahn H.S.,Center for Electrochemistry | And 3 more authors.
Journal of the American Chemical Society | Year: 2015

A liquid junction photoelectrochemical (PEC) solar cell based on p-type methylammonium lead iodide (p-MeNH3PbI3) perovskite with a large open-circuit voltage is developed. MeNH3PbI3 perovskite is readily soluble or decomposed in many common solvents. However, the solvent dichloromethane (CH2Cl2) can be employed to form stable liquid junctions. These were characterized with photoelectrochemical cells with several redox couples, including I3 -/I-, Fc/Fc+, DMFc/DMFc+, and BQ/BQ. (where Fc is ferrocene, DMFc is decamethylferrocene, BQ is benzoquinone) in CH2Cl2. The solution-processed MeNH3PbI3 shows cathodic photocurrents and hence p-type behavior. The difference between the photocurrent onset potential and the standard potential for BQ/BQ. is 1.25 V, which is especially large for a semiconductor with a band gap of 1.55 eV. A PEC photovoltaic cell, with a configuration of p-MeNH3PbI3/CH2Cl2, BQ (2 mM), BQ. (2 mM)/carbon, shows an open-circuit photovoltage of 1.05 V and a short-circuit current density of 7.8 mA/cm2 under 100 mW/cm2 irradiation. The overall optical-to-electrical energy conversion efficiency is 6.1%. The PEC solar cell shows good stability for 5 h under irradiation. © 2015 American Chemical Society.

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