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Lee, S.G.,Kim, J.,Woo, H.S.,Jo, Y.,Inamdar, A.I.,Pawar, S.M.,Kim, H.S.,Jung, W.,Im, H.S. Elsevier 2014 CURRENT APPLIED PHYSICS Vol.14 No.3
We fabricate a Cu<SUB>2</SUB>ZnSnS<SUB>4</SUB> (CZTS) absorber layer, by using single step electrodeposition of CZTS precursor, deposited at -1.05 V, followed by high temperature annealing in a sulfur atmosphere. X-ray diffraction pattern indicates that the as-grown sample is amorphous in nature, and polycrystalline CZTS thin films with kesterite crystal structure have been obtained by sulfurization from 450 to 580 <SUP>o</SUP>C. Surface morphologies of the as-grown sample show some voids with agglomerated particles. After sulfurization, the morphologies of the annealed samples become more uniform, and dense. EDAX study reveals that the sulfurized samples are nearly stoichiometric, being Cu-rich and S-deficient in composition. The band gaps of the annealed samples are found to be in the range from 1.9 to 1.5 eV.
D.S. Dhawale,R.R. Salunkhe,V.S. Jamadade,D.P. Dubal,S.M. Pawar,C.D. Lokhande 한국물리학회 2010 Current Applied Physics Vol.10 No.3
An electrosynthesis process of hydrophilic polyaniline nanofiber electrode for electrochemical supercapacitor is described. The TGA–DTA study showed polyaniline thermally stable up to 323 K. Polyaniline nanofibers exhibit amorphous nature as confirmed from XRD study. Smooth interconnected fibers having diameter between 120–125 nm and length typically ranges between 400–500 nm observed from SEM and TEM analysis. Contact angle measurement indicated hydrophilic nature of polyaniline fibers. Optical study revealed the presence of direct band gap with energy 2.52 eV. The Hall effect measurement showed room temperature resistivity ~3 × 10-4 Ω cm and Hall mobility 549.35 cm-2V-1 s-1. The supercapacitive performance of nanofibrous polyaniline film tested in 1 M H2SO4 electrolyte and showed highest specific capacitance of 861 F g-1 at the voltage scan rate of 10 mV/s.
V.D. Patake,S.M. Pawar,V.R. Shinde,T.P. Gujar,C.D. Lokhande 한국물리학회 2010 Current Applied Physics Vol.10 No.1
In the present study, ruthenium oxide (RuO2) thin films were deposited on the stainless steel (s.s.) substrates by anodic deposition. The nucleation and growth mechanism of electrodeposited RuO2 film has been studied by cyclic voltammetry (CV) and chronoamperometry (CA). The deposited films were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive analysis by X-rays (EDAX) for structural, morphological, and compositional studies. The electrochemical supercapacitor study of ruthenium oxide thin films have been carried out for different film thicknesses in 0.5 M H2SO4 electrolyte. The highest specific capacitance was found to be 1190 F/g for 0.376 mg/㎠ film thickness.
Optical properties in Mn-doped ZnS thin films: Photoluminescence quenching
Inamdar, A.I.,Cho, S.,Jo, Y.,Kim, J.,Han, J.,Pawar, S.M.,Woo, H.,Kalubarme, R.S.,Park, C.,Kim, H.,Im, H. North-Holland 2016 Materials letters Vol.163 No.-
Mn-doped ZnS thin films are synthesized on soda-lime glass substrates using magnetron co-sputtering technique. X-ray diffraction and atomic force microscopy measurements indicate that of the as-obtained films including the highest Mn (~11% relative to the Zn concentration) in the lattice of ZnS are amorphous with a granular morphology. X-ray photoelectron spectroscopy reveals the presence of Zn<SUP>2+</SUP>, Mn<SUP>2+</SUP> and S<SUP>2-</SUP> chemical states in the films. The undoped ZnS film exhibits photoluminescence (PL) peaks at energies around 3.26eV (wavelength ~379nm) and 2.95eV (~420nm), which originate from the interplay between excited electron, defect (sulfur vacancy) states and the valence band. For the Mn-doped ZnS films, the band-to-band emission peak is quenched and shifts toward to higher energies at a rate of 11.7+/-2meV/Mn%. We propose that Mn dopant-mediated structural phases and non-radiative deep traps in ZnS cause the modification in the optical transition.
Cho, Sangeun,Kim, Jongmin,Jo, Yongcheol,Ahmed, Abu Talha Aqueel,Chavan, H.S.,Woo, Hyeonseok,Inamdar, A.I.,Gunjakar, J.L.,Pawar, S.M.,Park, Youngsin,Kim, Hyungsang,Im, Hyunsik ELSEVIER SCIENCE 2017 JOURNAL OF ALLOYS AND COMPOUNDS Vol.725 No.-
<P><B>Abstract</B></P> <P>Ruthenium oxide (RuO<SUB>2</SUB>) is fabricated on graphene (Gr)-coated Copper (Cu) foil by using a cathodic electroplating technique for flexible supercapacitor electrode applications. The electrochemical properties of the RuO<SUB>2</SUB>/Gr/Cu electrode are investigated with a conventional three electrode configuration in 0.5 M H<SUB>2</SUB>SO<SUB>4</SUB> electrolyte. The graphene insertion layer plays a key role in improving the structural and electrochemical properties of the RuO<SUB>2</SUB> electrode film under the bent condition. The electrode exhibits a specific capacitance of 1561 F g<SUP>−1</SUP> (0.015 F cm<SUP>−1</SUP>) at a scan rate of 5 mV s<SUP>−1</SUP> and a significantly improved retention of 98% under the bent condition. The flexible RuO<SUB>2</SUB>/Gr/Cu electrode exhibits a high energy density of ∼13 Wh kg<SUP>−1</SUP> at a power density of ∼21 kW kg<SUP>−1</SUP>. The excellent capacitance retention and electrochemical stability of the flexible RuO<SUB>2</SUB>/Gr/Cu electrode are due to the improved mechanical adhesion between the RuO<SUB>2</SUB> and the current collector. This flexible RuO<SUB>2</SUB>/Gr/Cu film could be used as a supercapacitor electrode with a high capacity and long-cycle life for the next-generation flexible electronic applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A binder-free Bendable RuO<SUB>2</SUB> thin film is fabricated on a graphene/Cu substrate using an electroplating method. </LI> <LI> Electrochemical energy storage properties of RuO<SUB>2</SUB> are investigated for supercapacitor applications. </LI> <LI> Excellent capacitance retention and electrochemical stability are obtained. </LI> </UL> </P>
Pawar, N.B.,Mali, S.S.,Kharade, S.D.,Gang, M.G.,Patil, P.S.,Kim, J.H.,Hong, C.K.,Bhosale, P.N. Elsevier 2014 CURRENT APPLIED PHYSICS Vol.14 No.3
In the present paper we report structural, optical, morphological and electrical properties of thin films of MoBi<SUB>2</SUB>S<SUB>5</SUB> prepared by facile self organized arrested precipitation technique (APT) from aqueous alkaline bath. X-ray diffraction study on thin films suggests orthorhombic and rhombohedral mixed phase structure. The samples are further annealed under vacuum at 373 and 473 K. The EDS pattern shows minor loss of sulphur upto 473 K. The optical absorption in visible region shows direct allowed transition with band gap variation over 1.2-1.1 eV. Post-heat treated samples exhibit n-type electrical conductivity. SEM images show uniform distribution of spherical grains with diameter ~200 nm for as-synthesized MoBi<SUB>2</SUB>S<SUB>5</SUB> thin film. The grain size increases with annealing temperature and morphology becomes more compact due to crystallization of thin film. The surface roughness deduced from AFM, was in the range of 1.29-1.92 nm. The MoBi<SUB>2</SUB>S<SUB>5</SUB> thin films are employed for the fabrication of photoelectrochemical solar cells as all the samples exhibit strong absorption in visible to near IR region. Due to vacuum annealing it gives a significant enhancement of power conversion efficiency (η) upto 0.14% as compared to as-synthesized MoBi<SUB>2</SUB>S<SUB>5</SUB> thin film.
N.B. Pawar,S.S. Mali,S.D. Kharade,M.G. Gang,P.S. Patil,김진혁,C.K. Hong,P.N. Bhosale 한국물리학회 2014 Current Applied Physics Vol.14 No.3
In the present paper we report structural, optical, morphological and electrical properties of thin films of MoBi2S5 prepared by facile self organized arrested precipitation technique (APT) from aqueous alkaline bath. X-ray diffraction study on thin films suggests orthorhombic and rhombohedral mixed phase structure. The samples are further annealed under vacuum at 373 and 473 K. The EDS pattern shows minor loss of sulphur upto 473 K. The optical absorption in visible region shows direct allowed transition with band gap variation over 1.2e1.1 eV. Post-heat treated samples exhibit n-type electrical conductivity. SEM images show uniform distribution of spherical grains with diameter w200 nm for as-synthesized MoBi2S5 thin film. The grain size increases with annealing temperature and morphology becomes more compact due to crystallization of thin film. The surface roughness deduced from AFM, was in the range of 1.29e1.92 nm. The MoBi2S5 thin films are employed for the fabrication of photoelectrochemical solar cells as all the samples exhibit strong absorption in visible to near IR region. Due to vacuum annealing it gives a significant enhancement of power conversion efficiency (h) upto 0.14% as compared to as-synthesized MoBi2S5 thin film.
S.M. Pawar,B.S. Pawar,Bo Hou,A.T.A. Ahmed,H.S. Chavan,조용철,조상근,김종민,서지우,차승남,A. I. Inamdar,김형상,임현식 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.69 No.-
High-density CuCo2O4 nanosheets are grown on Ni foam using electrodeposition followed by airannealing for a Li-ion battery anode. The anode exhibits a high discharge capacity of 1244 mAh/g at 0.1 A/g (82% coulombic efficiency) and excellent high-rate performance with 95% capacity retention(1100 mAh/g after 200 cycles at 1 A/g). The outstanding battery performance of the CuCo2O4 anode isattributed to its binder-free direct contact to the current collector and high-density nanosheetmorphology. The present experimentalfindings demonstrate that the electrodeposited binder-freeCuCo2O4 material may serve as a safe, low-cost, long-cycle life anode for Li-ion batteries.
Pawar, S.M.,Moholkar, A.V.,Kim, I.K.,Shin, S.W.,Moon, J.H.,Rhee, J.I.,Kim, J.H. Elsevier 2010 Current Applied Physics Vol.10 No.2
<P><B>Abstract</B></P><P>The polycrystalline Cu<SUB>2</SUB>ZnSnS<SUB>4</SUB> (CZTS) thin films have been prepared by pulsed laser deposition (PLD) method at room temperature. The laser incident energy was varied from 1.0 at the interval of 0.5–3.0J/cm<SUP>2</SUP>. The effect of laser incident energy on the structural, morphological and optical properties of CZTS thin films was studied by means of X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and optical absorption. The studies reveal that an improvement in the structural, morphological and optical properties of CZTS thin films with increasing laser incident energy up to 2.5J/cm<SUP>2</SUP>. However, when the laser incident energy was further increased to 3.0J/cm<SUP>2</SUP>, leads to degrade the structural, morphological and optical properties of the CZTS thin films.</P>
Pawar, S.M.,Pawar, B.S.,Hou, Bo,Ahmed, A.T.A.,Chavan, H.S.,Jo, Yongcheol,Cho, Sangeun,Kim, Jongmin,Seo, Jiwoo,Cha, SeungNam,Inamdar, A.I.,Kim, Hyungsang,Im, Hyunsik Elsevier 2019 Journal of industrial and engineering chemistry Vol.69 No.-
<P><B>Abstract</B></P> <P>High-density CuCo<SUB>2</SUB>O<SUB>4</SUB> nanosheets are grown on Ni foam using electrodeposition followed by air annealing for a Li-ion battery anode. The anode exhibits a high discharge capacity of 1244mAh/g at 0.1A/g (82% coulombic efficiency) and excellent high-rate performance with 95% capacity retention (1100mAh/g after 200 cycles at 1A/g). The outstanding battery performance of the CuCo<SUB>2</SUB>O<SUB>4</SUB> anode is attributed to its binder-free direct contact to the current collector and high-density nanosheet morphology. The present experimental findings demonstrate that the electrodeposited binder-free CuCo<SUB>2</SUB>O<SUB>4</SUB> material may serve as a safe, low-cost, long-cycle life anode for Li-ion batteries.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Synthesis of high-density CuCo<SUB>2</SUB>O<SUB>4</SUB> nanosheets via electrodeposition method. </LI> <LI> CuCo<SUB>2</SUB>O<SUB>4</SUB> nanosheet electrode exhibits a high discharge capacity of 1244mAh/g at 0.1A/g. </LI> <LI> Excellent rate capability and stability with 95% capacity retention after 200 cycles. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>