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Johns Naduvath

Bio: Johns Naduvath is an academic researcher from Indian Institute of Technology Bombay. The author has contributed to research in topics: Thin film & Dye-sensitized solar cell. The author has an hindex of 10, co-authored 18 publications receiving 262 citations. Previous affiliations of Johns Naduvath include Indian Institutes of Technology & St. Thomas College.

Papers
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Journal ArticleDOI
TL;DR: The dye-sensitized solar cells (DSSCs) as mentioned in this paper can be considered to be electrochemical devices consisting of a photoanode which has a thick film of a wide band gap oxide semiconductor, typically coated on a transparent conductive oxide (TCO) glass substrate, with TiO2 being sensitized with adsorbed dyes that absorb visible light.
Abstract: The development of dye sensitized solar cells (DSSCs), which have derived inspiration from photosynthesis, has opened up exciting new possibilities and paradigms for producing solar photovoltaics possibly at lower cost. The dye-sensitized solar cells with moderate power conversion (∼10%) efficiencies can be manufactured under regular lab conditions without needing clean rooms or very specialized facilities. The entire processing need not involve even a single vapour deposition step. The DSSCs can be considered to be electrochemical devices consisting of (a) a photoanode which has a thick film of a wide band gap oxide semiconductor (like TiO2), typically coated on a transparent conductive oxide (TCO) glass substrate, with TiO2 being sensitized with adsorbed dyes that absorb visible light, (b) an electrolyte that establishes the internal electrical continuity between anode and counter electrode and mainly plays the role of regenerating the dye such that the photoexcitation, electron injection and current fl...

109 citations

Journal ArticleDOI
TL;DR: The single crystal like TiO(2) nanot tubes show superior performance as supercapacitor electrodes compared to the normal polycrystalline titanium dioxide nanotubes.
Abstract: Single crystal like TiO(2) nanotubes with preferential orientation along the [001] direction, parallel to the growth direction of nanotubes, that offer ease of charge transport much higher than reported so far, are fabricated using a cost effective two step technique. The success of this method to grow the nanotubes with the anomalous intense [001] preferential orientation is attributed to the zinc assisted minimization of the (001) surface energy. The single crystal like TiO(2) nanotubes show superior performance as supercapacitor electrodes compared to the normal polycrystalline titanium dioxide nanotubes.

28 citations

Journal ArticleDOI
TL;DR: The paper reports the fabrication of Zn-doped TiO2 nanotubes (Zn-TONT)/ZnO nanoflakes heterostructure for the first time, which shows improved performance as a photoanode in dye-sensitized solar cell (DSSC).
Abstract: The paper reports the fabrication of Zn-doped TiO2 nanotubes (Zn-TONT)/ZnO nanoflakes heterostructure for the first time, which shows improved performance as a photoanode in dye-sensitized solar cell (DSSC). The layered structure of this novel nanoporous structure has been analyzed unambiguously by Rutherford backscattering spectroscopy, scanning electron microscopy, and X-ray diffractometer. The cell using the heterostructure as photoanode manifests an enhancement of about an order in the magnitude of the short circuit current and a seven-fold increase in efficiency, over pure TiO2 photoanodes. Characterizations further reveal that the Zn-TONT is preferentially oriented in [001] direction and there is a Ti metal-depleted interface layer which leads to better band alignment in DSSC.

21 citations

Journal ArticleDOI
TL;DR: In this paper, the authors report the synthesis and stability studies of Cs2SnI6 towards its application as a solid-state Hole Transport Material (HTM) in Titania Nanotube (TNT) based Dye Sensitized Solar Cells (DSSCs).

20 citations

Journal ArticleDOI
TL;DR: In this article, a detailed study on low temperature (6-300 K) electrical conductivity and Seebeck coefficient on copper indium oxide polycrystalline thin films deposited on soda lime glass substrates by a reactive evaporation method is presented.
Abstract: This is the first report on the detailed study on low temperature (6–300 K) electrical conductivity and Seebeck coefficient on copper indium oxide polycrystalline thin films deposited on soda lime glass substrates by a reactive evaporation method. These films, characterized using various experimental techniques, show the highest electrical conductivity (20 to 125 S cm−1) reported to date as well as n- and p- type conductivity. The electrical conductivity mechanisms, based on Mott's, Seto's and Arrhenius models, in different temperature regimes, comprise of variable range hopping, grain boundary effect and activated thermal conduction. Most interestingly, the thin films manifest a high thermoelectric power factor and absorption in the UV region, indicating their potential in thermoelectric and UV energy conversion device fabrication, respectively.

19 citations


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Journal ArticleDOI
TL;DR: An in-depth review on DSSC construction, operating principle, key problems (low efficiency, low scalability, and low stability), prospective efficient materials, and finally a brief insight to commercialization are provided.
Abstract: Dye-sensitized solar cells (DSSCs) belong to the group of thin-film solar cells which have been under extensive research for more than two decades due to their low cost, simple preparation methodology, low toxicity and ease of production. Still, there is lot of scope for the replacement of current DSSC materials due to their high cost, less abundance, and long-term stability. The efficiency of existing DSSCs reaches up to 12%, using Ru(II) dyes by optimizing material and structural properties which is still less than the efficiency offered by first- and second-generation solar cells, i.e., other thin-film solar cells and Si-based solar cells which offer ~ 20–30% efficiency. This article provides an in-depth review on DSSC construction, operating principle, key problems (low efficiency, low scalability, and low stability), prospective efficient materials, and finally a brief insight to commercialization.

547 citations

Journal ArticleDOI
TL;DR: A comprehensive review on recent progress of the synthesis and modification ofTiO2 nanotubes to be used for photo/photoelectro‐catalytic water splitting and the future development of TiO2 Nanotubes is discussed.
Abstract: Hydrogen production from water splitting by photo/photoelectron-catalytic process is a promising route to solve both fossil fuel depletion and environmental pollution at the same time. Titanium dioxide (TiO2) nanotubes have attracted much interest due to their large specific surface area and highly ordered structure, which has led to promising potential applications in photocatalytic degradation, photoreduction of CO2, water splitting, supercapacitors, dye-sensitized solar cells, lithium-ion batteries and biomedical devices. Nanotubes can be fabricated via facile hydrothermal method, solvothermal method, template technique and electrochemical anodic oxidation. In this report, we provide a comprehensive review on recent progress of the synthesis and modification of TiO2 nanotubes to be used for photo/photoelectro-catalytic water splitting. The future development of TiO2 nanotubes is also discussed.

409 citations

Reference EntryDOI
09 Aug 2017

261 citations

Journal ArticleDOI
TL;DR: In this article, the authors reviewed the various approaches taken by different perspectives in increasing the solid-state and quasi-solid DSSCs performances utilized solid and gel polymeric electrolytes.

248 citations

Journal ArticleDOI
TL;DR: In this article, the effect of influencing parameters on the photo-voltaic characteristics of photo-anode for dye-sensitized solar cell application is discussed and the descriptions have been made by summarizing the relevant literature reports.
Abstract: Dye sensitized solar cells are attractive as simple and low cost renewable energy source. In dye sensitized solar cells, photo-anode plays significant role for collection and transportation of photo-excited electrons from dye to external electric circuit. Usually, wide band gap semiconducting metal oxides like titania, zinc oxide etc are deposited over transparent conducting substrate to prepare the photo-anodes. The performances of the photo-anodes depend on the band gap, morphology, composition of metal oxides and thickness of metal oxide layers. Enormous research efforts have been accomplished for studying the photo-voltaic characteristics of the dye sensitized solar cells by varying the aforementioned influencing parameters. However, the research activities executed towards the modification of photo-anode for dye sensitized solar cell application are quite scattered. It seems therefore important to summarize the research efforts executed towards the development of photo-anode for dye sensitized solar cell. In the present review, the effect of influencing parameters on the photo-voltaic characteristics of photo-anode for dye sensitized solar cell application is discussed. The descriptions have been made by summarizing the relevant literature reports.

184 citations