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Review on Cu2SnS3, Cu3SnS4, and Cu4SnS4 thin films and their photovoltaic performance
Vasudeva Reddy Minnam Reddy,Mohan Reddy Pallavolu,Phaneendra Reddy Guddeti,Sreedevi Gedi,Kishore Kumar Yarragudi Bathal Reddy,Babu Pejjai,김우경,Thulasi Ramakrishna Reddy Kotte,박진호 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.76 No.-
The rapid progress on the Cu–Sn–S (Cu2SnS3, Cu3SnS4, and Cu4SnS4) solar cells has opened a new avenueto generate the electrical energy at ultra-low-cost. Therefore, the progress in the deposition of Cu2SnS3,Cu3SnS4, and Cu4SnS4 thinfilms by various chemical and physical methods is reviewed comprehensively. This article briefly describes (i) the phase diagrams of Cu–Sn–S, (ii) the bulk properties of Cu2SnS3,Cu3SnS4, and Cu4SnS4, (iii) the effect of deposition conditions on the phase formation, (iv) the physicalproperties of Cu2SnS3, Cu3SnS4, and Cu4SnS4 thinfilms, and (v) the photovoltaic performance of Cu2SnS3,Cu3SnS4, and Cu4SnS4 solar cells.
Montmorillonite Clay Catalyzed Three Component, One-Pot Synthesis of 5-Hydroxyindole Derivatives
Reddy, B.V. Subba,Reddy, P. Sivaramakrishna,Reddy, Y. Jayasudhan,Bhaskar, N.,Reddy, B. Chandra Obula Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.10
A highly efficient and environmentally benign protocol has been developed for the first time to produce a wide range of biologically active 5-hydroxyindole derivatives using montmorillonite KSF clay as a reusable solid acid catalyst. The use of recyclable clay makes this procedure quite simple, more convenient and cost-effective.
Reddy, B. Surendra,Reddy, A. Babul,Reddy, G. Ramachandra,Reddy, P. Raveendra Korean Chemical Society 2011 대한화학회지 Vol.55 No.6
The synthesis, as well as spectroscopic and biological studies of a novel class of [3-(4-substitutedphenylamino)-8-azabicyclo [3.2.1] oct-8yl]-phenyl-methanone derivatives are described. All the synthesized compounds were characterized by elemental analysis FTIR, $^1H$-NMR, $^{13}C$ NMR, and Mass spectral data. All the synthesized compounds were exhibit in vitro antibacterial activity.
Development of sulphurized SnS thin film solar cells
MINNAM REDDY VASUDEVA REDDY,Sreedevi Gedi,박진호,Miles R.W,Ramakrishna Reddy K.T 한국물리학회 2015 Current Applied Physics Vol.15 No.5
Thin films of tin sulphide (SnS) have been grown by sulphurization of sputtered tin precursor layers in a closed chamber. The effect of sulphurization temperature (Ts) that varied in the range of 150-450 ℃ for a fixed sulphurization time of 120 min on SnS film was studied through various characterization techniques. X-ray photoelectron spectroscopy analysis demonstrated the transformation of metallic tin layers into SnS single phase for Ts between 300 ℃ and 350 ℃. The X-ray diffraction measurements indicated that all the grown films had the (111) crystal plane as the preferred orientation and exhibited orthorhombic crystal structure. Raman analysis showed modes at 95 cm-1, 189 cm-1 and 218 cm-1 are related to the Ag mode of SnS. AFM images revealed a granular change in the grain growth with the increase of Ts. The optical energy band gap values were estimated using the transmittance spectra and found to be varied from 1.2 eV to 1.6 eV with Ts. The Hall effect measurements showed that all the films were p-type conducting nature and the layers grown at 350 ℃ showed a low electrical resistivity of 64 Ω-cm, a net carrier concentration of 2 × 1016 cm3 and mobility of 41 cm2 V-1 s-1. With the use of sprayed Zn0.76Mg0.24O as a buffer layer and the sputtered ZnO:Al as window layer, the SnS based thin film solar cell was developed that showed a conversion efficiency of 2.02%.
Simple Synthesis Of Graphitic Carbon Nitride Based Composite For Heavy Metals Removal From Water
Janardhan Reddy Koduru(Koduru Janardhan Reddy),Zahid Husain Momin,Lakshmi Prasanna Lingamdinne,Ganesh Kumar Reddy Angaru,Yoon-Young Chang(장윤영),Jae-Kyu Yang(양재규) 대한환경공학회 2021 대한환경공학회 학술발표논문집 Vol.2021 No.11
Minnam Reddy, Vasudeva Reddy,Cho, Haeyun,Gedi, Sreedevi,Reddy, K.T. Ramakrishna,Kim, Woo Kyoung,Park, Chinho Elsevier 2019 JOURNAL OF ALLOYS AND COMPOUNDS Vol.806 No.-
<P><B>Abstract</B></P> <P>Earth-abundant tin monosulfide (SnS) thin films have attracted considerable interest for eco-friendly and low-cost thin film solar cells. However, less attention has been paid on the fabrication of SnS solar cell by the industrial processes. In view of that the current study aimed to fabricate the SnS solar cells via two-stage (sputtering + sulfurization) industrial process. For the preparation of SnS thin films, first tin metallic precursor layers were deposited by DC sputtering and then sulfurized using the rapid thermal effusion cell evaporation process. The effect of sulfurization temperature on the physical properties of SnS thin films and the efficiency of SnS solar cells was examined. Formation of the single phase SnS thin films was confirmed when the tin metallic precursor layers sulfurized in the range of 450–470 °C, whereas secondary phases of Sn, SnS<SUB>2</SUB>, and Sn<SUB>2</SUB>S<SUB>3</SUB> were noticed at the sulfurization temperature lower than 450 °C and re-evaporation of deposited SnS thin films was observed at the sulfurization temperature higher than 470 °C. Solar cell fabricated with SnS absorber sulfurized at a temperature of 470 °C showed the conversion efficiency of ∼ 2.3%. The causes for lower efficiency of these solar cells were recombination in the SnS absorber and non-uniform compositional distribution of Cd, S and Sn as a function of depth in the CdS/SnS/Mo structure.</P> <P><B>Highlights</B></P> <P> <UL> <LI> SnS films were grown via sulfurization using effusion cell evaporation method. </LI> <LI> Effect of sulfurization temperature on the efficiency of SnS solar cells was examined. </LI> <LI> A high efficiency of ∼2.3% for SnS solar cells was achieved at 470 °C. </LI> <LI> The causes for lower efficiency of these solar cells were investigated. </LI> </UL> </P>
Chundi Seshendra Reddy,Liwen Zhang,Yejun Qiu,Yanan Chen,A. Sivasankar Reddy,P. Sreedhara Reddy,Sreekantha Reddy Dugasani 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.63 No.-
Graphene-based device/sensor made of multifunctional nanomaterials is an emerging technology due to its huge impact on the engineering materials. Herein, we report the synthesis of pristine SnO2, Al-doped SnO2 (Al–SnO2), and graphene-embedded Al–SnO2 (G–Al–SnO2) nanotubes by one-step electrospinning method and studied their physical and gas sensing characteristics. The synthesized tubular structure was confirmed by scanning electron microscope (SEM) and transmission electron microscope (TEM). Structural, chemical binding, pore size, and chemical composition/elemental states were estimated by the X-ray diffraction, Raman, BET, and X-ray photoelectron spectroscopy, respectively. The performance of the gas sensing based on SnO2, Al–SnO2, and G–Al–SnO2 materials for H2 detection was investigated, and the G–Al–SnO2 composite nanotubes exhibit the superior sensitivity at 300 °C. The sensing response reaches about 23.8 at H2 concentration of 100 ppm with a shorter response time of about 2.2 s and recovery time of about 1.4 s. The gas sensing performance of the G–Al–SnO2 nanotubes is much better than that of the pristine SnO2 and Al–SnO2 nanotubes, which is probably attributed to the relatively smaller diameter of about 100 nm, better thermal and electronic conductivity, and relatively high oxygen vacancy, induced by graphene and Al-doping. The prepared H2 sensor is a simple, compact and highly sensitive, which holds high promising in many fields.