R. N. Bhattacharya

Indian Institute of Science Education and Research Kolkata

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R. Noufi

National Renewable Energy Laboratory

K. Ramanathan

National University Hospital

R. D. Blaugher

National Renewable Energy Laboratory

MÁ

Miguel Á. Contreras

University of Florida

J. Keane

University of Alabama

W. Batchelor

ITN Energy Systems (United States)

H. Wiesner

National Renewable Energy Laboratory

P.J. Sebastián

Instituto Tecnológico y de Energías Renovables

Falah S. Hasoon

National Energy Research Center

A. M. Hermann

Institut National des Sciences Appliquées de Rennes

Cooperative Institutions

National Renewable Energy Laboratory

Colorado School of Mines

University of Colorado Boulder

Office of Scientific and Technical Information

National Technical Information Service

University of Houston

Sandia National Laboratories California

Sandia National Laboratories

Los Alamos National Laboratory

Oak Ridge National Laboratory

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ChemInform Abstract: IN SITU PREPARATION OF P‐TYPE CADMIUM TELLURIDE THIN FILMS BY CATHODIC ELECTRODEPOSITION

Chemischer Informationsdienst (1985)

R. N. Bhattacharya Krishnan Rajeshwar R. Noufi

Cadmium telluride photovoltaics

Telluride

10.1002/chin.198537012

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Citations (0)

Investigations into alternative substrate, absorber and buffer layer processing for Cu(In,Ga)Se/sub 2/-based solar cells

John R. Tuttle T. A. Berens J. Keane K. Ramanathan J.E. Granata

High-performance Cu(In,Ga)Se/sub 2/ (CIGS) based solar cells are fabricated within a narrow range of processing options. In this contribution, alternative substrate, absorber, and buffer layer processing is considered. Cell performance varies considerably when alternative substrates are employed. These variations are narrowed with the addition of Na via a Na/sub 2/S compound. Sputtered and electrodeposited CIGS precursors and completed absorbers show promise as alternatives to evaporation. A recrystallization process is required to improve their quality. (In,Ga)/sub y/Se buffer layers contribute to cell performance above 10%. Further improvements in these alternatives will lead to combined cell performance greater than 10% in the near term.

Buffer (optical fiber)

Recrystallization (geology)

10.1109/pvsc.1996.564248

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Cu(In, Ga)Se2 based photovoltaic structure by electrodeposition and processing

International Workshop on Physics of Semiconductor Devices (1998)

P.J. Sebastián M. E. Calixto R. N. Bhattacharya Ángel Marcos‐Fernández R. Noufi

CuIn 1-x Ga x Se 2 (CIGS) thin films were formed from an electrodeposited CuInSe 2 (CIS) precursor by thermal processing in vacuum in which the film stoichiometry was adjusted by adding In. Ga and Se. The structure, composition, morphology and opto-electronic properties of the as-deposited and selenized CIS precursors were characterized by various techniques. A 9.8% CIGS based thin film solar cell was developed using the electrodeposited and processed film. The cell structure consisted of Mo/CIGS/CdS/ZnO/MgF 2 . The cell parameters such as J sc , V 0c, FF and η were determined from I-V characterization of the cell.

Stoichiometry

Characterization

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Electrodeposited Biaxially Textured Buffer Layers for YBCO Superconductors

IEEE Transactions on Applied Superconductivity (2009)

R. N. Bhattacharya Sovannary Phok Wenjun Zhao Andrew G. Norman

Non-vacuum electrodeposition (ED) was used to prepare simplified Gd ₂ O ₃ /Gd ₂ Zr ₂ O ₇ and CeO ₂ /Gd ₂ Zr ₂ O ₇ buffer layers on a Ni-W substrate. Post-annealing conditions of electrodeposited precursor films were optimized to obtain high-quality biaxially textured buffer layers. The buffer layers were characterized by X-ray diffraction, optical profiling, and transmission electron microscopy (TEM). The effect of the cap layer thickness on the surface morphology and texture of the buffers was also studied. The microstructure of CeO ₂ /Gd ₂ Zr ₂ O ₇ was analysed and compared to Gd ₂ O ₃ /Gd ₂ Zr ₂ O ₇ . The high-resolution TEM shows biaxially textured crystalline elctrodeposited Gd ₂ O ₃ and CeO ₂ cap layers on the electrodeposited Gd ₂ Zr ₂ O ₇ layers without any defects. YBa ₂ Cu ₃ O _7-delta (YBCO) superconductor was deposited by pulsed laser deposition (PLD) on the simplified ED-Gd ₂ O ₃ /Gd ₂ Zr ₂ O ₇ and ED-CeO ₂ /Gd ₂ Zr ₂ O ₇ buffers. Transport current density of 3.3 MA/cm ² at 77 K was obtained for PLD YBCO deposited on ED-Gd ₂ O ₃ /Gd ₂ Zr ₂ O ₇ buffer layers.

10.1109/tasc.2009.2019603

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Citations (13)

Semiconducting polymer thin film sensors for detection of toxic gases

S C K Misra Archana Suri Subhas Chandra R. N. Bhattacharya

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Growth Conditions of Sequentially Electrodeposited Buffer Layers for YBCO Superconductor

IEEE Transactions on Applied Superconductivity (2009)

Sovannary Phok Wenjun Zhao R. N. Bhattacharya

We report recent technical advances in the fabrication by sequential electrodeposition (ED) of Gd ₂ O ₃ /Gd ₂ Zr ₂ O ₇ buffer architecture. A systematic study is performed for a fundamental understanding of the buffer structure grown by ED. The electrolyte composition, solution flow rate, composition/concentration of chemicals, and annealing conditions are found to affect considerably the deposition of the layer, formation of the pyrochlore oxide, and film texture. The as-deposited and annealed films were analyzed by inductively coupled plasma (ICP), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Smooth and crack-free layers were obtained. The surface roughness of the bilayer buffer was about 3 nm. Both layers were biaxially textured. The out-of-plane mosaic spread Deltaomega was about 6deg and 7.8deg for Gd ₂ Zr ₂ O ₇ and Gd ₂ O ₃ grains, respectively. The in-plane grain dispersion Deltaphi was 8.4deg and 9.3deg for Gd ₂ Zr ₂ O ₇ and Gd ₂ O ₃ layers, respectively.

10.1109/tasc.2009.2019250

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MANGROVE ECOSYSTEMS AND THEIR CONSERVATION

R. N. Bhattacharya Sayani Chanda Anwesha Mondal Animesh Ankuria

Mangrove ecosystems are arguably the most productive and diversified ecosystems present on the planet. Coastal ecosystems vary from the dense mangrove forests near the river mouth to the coastal dunes of the beach and the seagrass beds to the beautiful coral reefs just to name a few. Mangrove ecosystems are one of the most productive ecosystems in the planets, ecosystems like mangrove forests and seagrass beds are the best carbon sinks in the planets. Moreover, the high nutritive content in the mangrove areas makes the ecosystems coming under this banner the ideal site for breeding and nursery for many a marine finfish, shellfishes, reptiles and mammals. Also, the high biological productivity of the mangroves ecosystems also made these areas the center of human activities for millennia. Mangrove ecosystems provide an extensive spectrum of goods and services: they are primarily responsible for the production of fish, shellfish, and seaweed for both human and animal consumption; and they are a significant source of fertilizer, pharmaceuticals, cosmetics, household products, and construction supplies. Apart from diversity and productivity and services to human society, mangrove ecosystems are one the fastest depleting ecosystems of the globe at present. This chapter mainly focuses on the mangrove ecosystems, the threats they face and their conservation aspects.

Marine ecosystem

Mangrove ecosystem

Terrestrial ecosystem

10.58532/v3bcagp1ch34

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Photoredox/Nickel Dual Catalysis for C(sp2)-C(sp3) Cross Electrophile Coupling Reaction Using Phenols and Alcohols as the Latent Electrophile Sources

Sayan K. Jana R. N. Bhattacharya Purusattam Dey Sunit Chakraborty Biplab Maji

Introducing alkyl groups, particularly through innovative C(sp2)-C(sp3) bond-forming methods utilizing abundant feedstocks, holds promise for expanding chemical diversity, especially in drug discovery programs. Herein, we employed biomass-derived abundant phenols and alkyl alcohols as the coupling partners for the C(sp2)-C(sp3) cross-electrophile coupling reactions. Our innovation involved activating both the coupling partner via the same activator and designing a catalytic system that activates stronger bonds while ensuring coss-selectivity. The visible-light photoredox/nickel dual catalytic systems accommodate large substrate scope tolerating diverse functional groups. Besides, both the activation and cross-coupling reaction could be performed in one pot, and the reaction could be scaled up. Preliminary mechanistic studies involving luminescence quenching, cyclic voltammetry, radical quenching, and radical clock studies elucidated the proposed reaction mechanism.

Coupling reaction

Photoredox catalysis

Organic Synthesis

10.26434/chemrxiv-2024-mlh9c

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Citations (1)

ChemInform Abstract: Preparation of Lead‐Zirconium‐Titanium Film and Powder by Electrodeposition.

ChemInform (1996)

R. N. Bhattacharya D.S. Ginley

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Lead (geology)

10.1002/chin.199619012

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Preparation of Lead‐Zirconium‐Titanium Film and Powder by Electrodeposition

Journal of The Electrochemical Society (1996)

R. N. Bhattacharya D.S. Ginley

Lead‐zirconium‐titanium films and powders have been prepared by electrodeposition techniques that deposit all of the precursor components simultaneously while providing atomic scale mixing, reducing reaction time to the order of minutes to obtain desired phase development. Materials were characterized by x‐ray analysis, electron probe microanalysis, and Auger analysis.

Microanalysis

Auger electron spectroscopy

Electron probe microanalysis

10.1149/1.1836392

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Citations (5)