http://starc.stthomas.ac.in:8080/xmlui/xmlui/handle/123456789/33 2026-04-07T15:00:21Z http://starc.stthomas.ac.in:8080/xmlui/xmlui/handle/123456789/116 Progress on Low-Temperature Pulsed Electron Deposition of CuInGaSe2 Solar Cells Mazzer, Massimo; Rampino, Stefano; Gombia, Enos; Bronzoni, Matteo; Bissoli, Francesco; Pattini, Francesco; Calicchio, Marco; Kingma, Aldo; Annoni, Filippo; Calestani, Davide; Cavallari, Nicholas; Vijayan, Vimalkumar Thottapurath; Lomascolo, Mauro; Cretì, Arianna; Gilioli, Edmondo The quest for single-stage deposition of CuInGaSe2 (CIGS) is an open race to replace very effective but capital intensive thin film solar cell manufacturing processes like multiple-stage coevaporation or sputtering combined with high pressure selenisation treatments. In this paper the most recent achievements of Low Temperature Pulsed Electron Deposition (LTPED), a novel single stage deposition process by which CIGS can be deposited at 250 °C, are presented and discussed. We show that selenium loss during the film deposition is not a problem with LTPED as good crystalline films are formed very close to the melting temperature of selenium. The mechanism of formation of good ohmic contacts between CIGS and Mo in the absence of any MoSe2 transition layers is also illustrated, followed by a brief summary of the measured characteristics of test solar cells grown by LTPED. The 17% efficiency target achieved by lab-scale CIGS devices without bandgap modulation, antireflection coating or K-doping is considered to be a crucial milestone along the path to the industrial scale-up of LTPED. The paper ends with a brief review of the open scientific and technological issues related to the scale-up and the possible future applications of the new technology. 2016-03-16T00:00:00Z http://starc.stthomas.ac.in:8080/xmlui/xmlui/handle/123456789/60 Gas sensing application of nanocrystalline zinc oxide thin films prepared by spray pyrolysis R, Nisha; Madhusoodanan, KN; Vimalkumar, TV; Vijayakumar, KP Nanocrystalline oxygen-deficient ZnO thinfilm sensors were prepared by spray pyrolysis technique using zinc acetate dissolved in propanol and water as precursor. Response of the sensor to target gases NO2 and H2S is studied. At optimum temperature of 200∘C, the sensors have a response of 3.32 to 7 ppm NO2 and 1.4 to 18 ppm of H2S gas. The analytical characterizations of the prepared sensors were performed using X-ray diffraction measurement, scanning electron microscopy, energy-dispersive X-ray spectroscopy and Raman spectroscopy. Dynamic response of sensors to different concentrations of NO2 and H2S gas was tested at optimum temperature. Experimental data revealed the sensors to be more selective to NO2 gas with satisfactory response and recovery time. 2015-06-05T00:00:00Z