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All-carbon nanotube diode and solar cell statistically formed from macroscopic network

Nano Research 2015年第9期8卷 2800-2809页

作者： Albert G. Nasibulin adinath M. funde Ilya V. Anoshkin Igor A. Levitskyt kolkovo Institute of Science and Technology 100 Novaya str Skolkovo Moscow Region 143025 Russia Department of Material Science Saint-Petersburg State Polytechnical University Polytechnicheskaya 29 Saint-Petersburg 195251 Russia Department of Applied Physics Aalto University School of Science Puumiehenkuja 2 Espoo 00075 Finland School of Energy Studies Savitribai Phule Pune University Ganeshkhind Pune-411007 India Department of Chemistry University of Rhode Island R102881 USA Emitech Inc. Fall River MA 02720 USA

Schottky diodes and solar cells are statistically created in the contact area between two macroscopic films of single-walled carbon nanotubes （SWNTs） at the junction of semiconducting and quasi-metallic bundles consisting of several high quality tubes. The n-doping of one of the films allows for photovoltaic action, owing to an increase in the built-in potential at the bundle-to-bundle interface. Statistical analysis demonstrates that the Schottky barrier device contributes significantly to the I-V characteristics, compared to the p-n diode. The upper limit of photovoltaic conversion efficiency has been estimated at N20%, demonstrating that the light energy conversion is very efficient for such a unique solar cell. While there have been multiple studies on rectifying SWNT diodes in the nanoscale environment, this is the first report of a macroscopic all-carbon nanotube diode and solar cell.

关键词： all-carbon nanotube solarcell Schottky diode,carbon nanotube diode,carbon nanotube bundles

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Low substrate temperature deposition of transparent and conducting ZnO:Al thin films by RF magnetron sputtering

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Journal of Semiconductors 2016年第4期37卷 24-31页

作者： Ravindra Waykar Amit Pawbake Rupali Kulkarni Ashok Jadhavar adinath funde Vaishali Waman Rupesh Dewan Habib Pathan Sandesh Jadkar School of Energy Studies Savitribai Phule Pune UniversityPune 411007India Modern College of Arts Science and CommerceShivajinagarPune 411 005India Department of Physics Savitribai Phule Pune UniversityPune 411 007India

Transparent and conducting Al-doped ZnO（ZnO：Al） films were prepared on glass substrate using the RF sputtering method at different substrate temperatures from room temperature（RT） to 200 ℃. The structural,morphological, electrical and optical properties of these films were investigated using a variety of characterization techniques such as low angle XRD, Raman spectroscopy, X-ray photoelectron spectroscopy（XPS）, field-emission scanning electron microscopy（FE-SEM）, Hall measurement and UV–visible spectroscopy. The electrical properties showed that films deposited at RT have the lowest resistivity and it increases with an increase in the substrate temperature whereas carrier mobility and concentration decrease with an increase in substrate temperature. Low angle XRD and Raman spectroscopy analysis reavealed that films are highly crystalline with a hexagonal wurtzite structure and a preferred orientation along the c-axis. The FE-SEM analysis showed that the surface morphology of films is strongly dependent on the substrate temperature. The band gap decreases from 3.36 to 3.29 e V as the substrate temperature is increased from RT to 200 ℃. The fundamental absorption edge in the UV region shifts towards a longer wavelength with an increase in substrate temperature and be attributed to the Burstein-Moss shift. The synthesized films showed an average transmission（〉 85%） in the visible region, which signifies that synthesized ZnO：Al films can be suitable for display devices and solar cells as transparent electrodes.

关键词： ZnO thin film substrate temperature optical properties

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Substrate temperature dependent studies on properties of chemical spray pyrolysis deposited CdS thin films for solar cell applications

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Journal of Semiconductors 2017年第2期38卷 5-14页

作者： Kiran Diwate Amit Pawbake Sachin Rondiya Rupali Kulkarni Ravi Waykar Ashok Jadhavar Avinash Rokade adinath funde Kakasaheb Mohite Manish Shinde Habib Pathan Rupesh Devan Sandesh Jadkar School of Energy Studies Savitribai Phule Pune University Pune 411007 India C. T. Bora College Shirur Pune 412210 India Centre for Materials for Electronics Technology (C-MET) Pashan Road Pune 411008 India Department of Physics Savitribai Phule Pune University Pune 411007 India

Thin films of CdS have been prepared by chemical spray pyrolysis by spraying precursor solution directly onto soda lime glass（SLG） substrates. Influence of substrate temperature on structural, optical, morphological and electrical properties have been investigated by using various techniques such as low angle X-ray diffraction（XRD）, Raman spectroscopy, X-ray photoelectron spectroscopy（XPS）, field emission scanning electron microscopy（FESEM）, atomic force microscopy（AFM）, transmission electron microscopy（TEM）, UV–visible spectroscopy photoluminescence（PL） spectroscopy etc. Formation of CdS has been confirmed by low angle XRD,Raman spectroscopy and XPS analysis. XRD pattern showed that CdS films are polycrystalline, have hexagonal structure and prefer orientation of crystallites shifts from（101） to（002） with increase in substrate *** spectroscopy revealed that exciton-phonon coupling depends on substrate temperature and hence on crystallite size. Optical band gap increased from 2.43 to 2.99 eV when substrate temperature increased from 325 to 475 ℃. Transmittance of the film also showed an increasing trend from 52% to 80% with increase in substrate temperature. Such high band gap and transmittance values of CdS films prepared at 475℃ make it a useful window material in CdS/CdTe and CdS/Cu_2S heterojunction solar cells.

关键词： thin films CdS chemical spray pyrolysis FESEM Raman spectroscopy photoluminescence

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Efficient Synthesis of 3-Methyl-flavanones and Evaluation of Their Anti-bacterial Activity

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Chinese Journal of Chemistry 2012年第8期30卷 1695-1698页

作者： Nawghare Beena funde Sharad Raheem Abdul Lokhande Pradeep The Centre for Advanced Studies Department of Chemistry University of Pune Pune 411 007 India

A series of 2-phenyl-2,3-dihydrochromon-4-one derivatives （flavanone derivatives） were synthesized by silica gel assisted isomerization of several a-methyl-2＇-hydroxy chalcones in 74%--88% yield. These flavanones were further oxidized to 3-methyl flavones by using iodine in dimethyl sulphoxide at 60℃ in presence of acid. The newly synthesized derivatives were evaluated for in vitro study against Staphylococcus aureus, Micrococcus luteus and Staphylococcus epidermis.

关键词： cyclization oxidation chalcones silica gel 3-methyl-flavanones

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