• Ultrafast response humidity sensor using supramolecular nanofibre and its application in monitoring breath humidity and flow 

  Mogera, Umesha; Sagade, Abhay A.; George, Subi Jacob; Kulkarni, G. U. (Nature Publishing Group, 2014)

  Measuring humidity in dynamic situations calls for highly sensitive fast response sensors. Here we report, a humidity sensor fabricated using solution processed supramolecular nanofibres as active resistive sensing material. ...
• Low cost, rapid synthesis of graphene on Ni: An efficient barrier for corrosion and thermal oxidation 

  Mogera, Umesha; Kurra, Narendra; Radhakrishnan, Dhanya; Narayana, Chandrabhas; Kulkarni, G. U. (Pergamon-Elsevier Science Ltd, 2014)

  Graphene because of its inert and impermeable nature holds a great promise as a protective coating against corrosion and oxidation. It is envisioned that graphene coated metals will be increasingly used in metal and ...
• All-Solution-Processed, Ambient Method for ITO-Free, Roll-Coated Tandem Polymer Solar Cells using Solution-Processed Metal Films 

  Angmo, Dechan; Dam, Henrik F.; Andersen, Thomas R.; Zawacka, Natalia K.; Madsen, Morten V.; Stubager, Jorgen; Livi, Francesco; Gupta, Ritu; Helgesen, Martin; Carle, Jon E.; Larsen-Olsen, Thue T.; Kulkarni, G. U.; Bundgaard, Eva; Krebs, Frederik C. (Wiley-V C H Verlag Gmbh, 2014)

  A solution-processed silver film is employed in the processing of top-illuminated indium-tin-oxide (ITO)-free polymer solar cells in single-and double-junction (tandem) structures. The nontransparent silver film fully ...
• Cellphone Camera Imaging of a Periodically Patterned Chip as a Potential Method for Point-of-Care Diagnostics 

  Gupta, Ritu; Reifenberger, Ronald G.; Kulkarni, G. U. (American Chemical Society, 2014)

  In this study, we demonstrate that a disposable chip periodically patterned with, suitable ligands, an ordinary cellphone camera, and a simple pattern recognition software, can potentially be used for quantitative diagnostics. ...
• Digital grayscale printing for patterned transparent conducting Ag electrodes and their applications in flexible electronics 

  Gupta, Ritu; Hosel, Markus; Jensen, Jacob; Krebs, Frederik C.; Kulkarni, G. U. (Royal Society of Chemistry, 2014)

  Grayscale (halftone) laser printing is developed as a low-cost and solution processable fabrication method for ITO-free, semi-transparent and conducting Ag electrodes extendable over large area on a flexible substrate. The ...
• Large area defrosting windows based on electrothermal heating of highly conducting and transmitting Ag wire mesh 

  Kiruthika, S.; Gupta, Ritu; Kulkarni, G. U. (Royal Society of Chemistry, 2014)

  Highly interconnected crackles were obtained by spreading commercially available low cost crackle wall paint based precursor by the drop coating technique. An interconnected Ag mesh was fabricated by depositing metal over ...
• Large area solution processed transparent conducting electrode based on highly interconnected Cu wire network 

  Kiruthika, S.; Gupta, Ritu; Rao, K. D. M.; Chakraborty, Swati; Padmavathy, Nagarajan; Kulkarni, G. U. (Royal Society of Chemistry, 2014)

  Virtually unlimited and highly interconnected Cu wire networks have been fabricated on polyethylene terephthalate (PET) substrates with sheet resistance of <5 Omega square(-1) and transmittance of similar to 75%, as ...
• Fabrication of Large Area, High-Performance, Transparent Conducting Electrodes Using a Spontaneously Formed Crackle Network as Template 

  Rao, K. D. M.; Gupta, Ritu; Kulkarni, G. U. (Wiley-Blackwell, 2014)
• Worldwide outdoor round robin study of organic photovoltaic devices and modules 

  Madsen, Morten V.; Gevorgyan, Suren A.; Pacios, R.; Ajuria, J.; Etxebarria, I.; Kettle, Jeff; Bristow, Noel D.; Neophytou, Marios; Choulis, Stelios A.; Roman, Lucimara Stolz; Yohannes, Teketel; Cester, Andrea; Cheng, Pei; Zhan, Xiaowei; Wu, Jiang; Xie, Zhiyuan; Tu, Wei-Chen; He, Jr-Hau; Fell, Christopher J.; Anderson, Kenrick; Hermenau, Martin; Bartesaghi, Davide; Koster, L. Jan Anton; Machui, Florian; Gonzalez-Valls, Irene; Lira-Cantu, Monica; Khlyabich, Petr P.; Thompson, Barry C.; Gupta, Ritu; Shanmugam, Kiruthika; Kulkarni, G. U.; Galagan, Yulia; Urbina, Antonio; Abad, Jose; Roesch, Roland; Hoppe, Harald; Morvillo, P.; Bobeico, E.; Panaitescu, Eugen; Menon, Latika; Luo, Qun; Wu, Zhenwu; Ma, Changqi; Hambarian, Artak; Melikyan, Varuzhan; Hambsch, M.; Burn, Paul L.; Meredith, Paul; Rath, Thomas; Dunst, Sebastian; Trimmel, Gregor; Bardizza, Giorgio; Muellejans, Harald; Goryachev, A. E.; Misra, Ravi K.; Katz, Eugene A.; Takagi, Katsuhiko; Magaino, Shinichi; Saito, Hidenori; Aoki, Daisuke; Sommeling, Paul M.; Kroon, Jan M.; Vangerven, Tim; Manca, Jean; Kesters, Jurgen; Maes, Wouter; Bobkova, Olga D.; Trukhanov, Vasily A.; Paraschuk, Dmitry Yu.; Castro, Fernando A.; Blakesley, James; Tuladhar, Sachetan M.; Roehr, Jason Alexander; Nelson, Jenny; Xia, Jiangbin; Parlak, Elif Alturk; Tumay, Tulay Ash; Egelhaaf, Hans-Joachim; Tanenbaum, David M.; Ferguson, Gretta Mae; Carpenter, Robert; Chen, Hongzheng; Zimmermann, Birger; Hirsch, Lionel; Wantz, Guillaume; Sun, Ziqi; Singh, Pradeep; Bapat, Chaitnya; Offermans, Ton; Krebs, Frederik C. (Elsevier Science Bv, 2014)

  Accurate characterization and reporting of organic photovoltaic (OPV) device performance reniains one of the important challenges in the field. The large spread among the efficiencies of devices with the same structure ...
• Solution processed sun baked electrode material for flexible supercapacitors 

  Kurra, Narendra; Kiruthika, S.; Kulkarni, G. U. (Royal Society of Chemistry, 2014)

  We report a new strategy for making electrode materials for supercapacitors based on a nanocrystalline Pd/carbon (nc-Pd/C) composite, obtained by thermolyzing a thin film of Pd hexadecylthiolate under sunlight. Thus obtained ...
• Transparent and flexible capacitor fabricated using a metal wire network as a transparent conducting electrode 

  Gupta, Ritu; Rao, K. D. M.; Kulkarni, G. U. (Royal Society of Chemistry, 2014)

  As transparency is becoming a desirable property even in non-optoelectronic devices, there is great impetus given to alternate materials and strategies replacing the conventional ITO. Here we have used transparent Au wire ...
• A highly crystalline single Au wire network as a high temperature transparent heater 

  Rao, K. D. M.; Kulkarni, G. U. (Royal Society of Chemistry, 2014)

  A transparent conductor which can generate high temperatures finds important applications in optoelectronics. In this article, a wire network made of Au on quartz is shown to serve as an effective high temperature transparent ...
• Spray Coating of Crack Templates for the Fabrication of Transparent Conductors and Heaters on Flat and Curved Surfaces 

  Gupta, Ritu; Rao, K. D. M.; Srivastava, Kartikeya; Kumar, Ankush; Kiruthika, S.; Kulkarni, G. U. (American Chemical Society, 2014)

  Transparent conducting electrodes (TCEs) have been made on flat, flexible, and curved surfaces, following a crack template method in which a desired surface was uniformly spray-coated with a crackle precursor (CP) and metal ...
• Outdoor Operational Stability of Indium-Free Flexible Polymer Solar Modules Over 1 Year Studied in India, Holland, and Denmark 

  Angmo, Dechan; Sommeling, Paul M.; Gupta, Ritu; Hosel, Markus; Gevorgyan, Suren A.; Kroon, Jan M.; Kulkarni, G. U.; Krebs, Frederik C. (Wiley-V C H Verlag Gmbh, 2014)

  We present an outdoor interlaboratory stability study of fully printed and coated indium-tin-oxide (ITO)-free polymer solar cell modules in JNCASR Bangalore (India), ECN (Holland), and DTU (Denmark) carried over more than ...
• Metal wire network based transparent conducting electrodes fabricated using interconnected crackled layer as template 

  Kiruthika, S.; Rao, K. D. M.; Kumar, Ankush; Gupta, Ritu; Kulkarni, G. U. (IoP Publishing Ltd, 2014)

  A metal (Au) wire network, nearly invisible to the naked eye, has been realized on common substrates such as glass, to serve as a transparent conducting electrode (TCE). The process involves coating a TiO2 nanoparticle ...
• Metal-organic molecular device for non-volatile memory storage 

  Radha, B.; Sagade, Abhay A.; Kulkarni, G. U. (American Institute of Physics, 2014)

  Non-volatile memory devices have been of immense research interest for their use in active memory storage in powered off-state of electronic chips. In literature, various molecules and metal compounds have been investigated ...
• Nanocrystalline Ag microflowers as a versatile SERS platform 

  Mettela, Gangaiah; Siddhanta, Soumik; Narayana, Chandrabhas; Kulkarni, G. U. (Royal Society of Chemistry, 2014)

  In this paper, the synthesis of Ag microflowers for use as manipulable and reusable substrates in surface enhanced Raman spectroscopy (SERS) is demonstrated, working with ultra-low volumes of the analyte. Flower-like AgBr ...
• Solution processed large area fabrication of Ag patterns as electrodes for flexible heaters, electrochromics and organic solar cells 

  Gupta, Ritu; Walia, Sunil; Hosel, Markus; Jensen, Jacob; Angmo, Dechan; Krebs, Frederik C.; Kulkarni, G. U. (Royal Society of Chemistry, 2014)

  A simple method for producing patterned Ag electrodes on transparent and flexible substrates is reported. The process makes use of a laser printed toner as a sacrificial template for an organic precursor, which upon ...
• Nanocarbon-Scanning Probe Microscopy Synergy: Fundamental Aspects to Nanoscale Devices 

  Kurra, Narendra; Reifenberger, Ronald G.; Kulkarni, G. U. (American Chemical Society, 2014)

  Scanning probe techniques scanning tunneling microscopy (STM) and atomic force microscopy (AFM) have emerged as unique local probes for imaging, manipulation, and modification of surfaces at the nanoscale. Exercising the ...
• A cracked polymer templated metal network as a transparent conducting electrode for ITO-free organic solar cells 

  Rao, K. D. M.; Hunger, Christoph; Gupta, Ritu; Kulkarni, G. U.; Thelakkat, Mukundan (Royal Society of Chemistry, 2014)

  We report a highly transparent, low resistance Ag metal network templated by a cracked polymer thin film and its incorporation in an organic solar cell. The performance of this scalable metallic network is comparable to ...

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