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Browsing Narayan K. S. by Issue Date

Browsing Narayan K. S. by Issue Date

Now showing items 1-20 of 29

Photoconductive NSOM for mapping optoelectronic phases in nanostructures

Das, Anshuman J.; Shivanna, Ravichandran; Narayan, K. S. (Walter De Gruyter Gmbh, 2014)

The advent of optically functional materials with low-intensive processing methods is accompanied by a growing need for high resolution imaging to probe the inherent inhomogeneities in the underlying microstructure. Atomic ...
Morphology and electrostatics play active role in neuronal differentiation processes on flexible conducting substrates

Srivastava, Nishit; James, Jackson; Narayan, K. S. (Landes Bioscience, 2014)

This commentary discusses and summarizes the key highlights of our recently reported work entitled "Neuronal Differentiation of Embryonic Stem Cell Derived Neuronal Progenitors Can Be Regulated by Stretchable Conducting ...
Organic photovoltaics: key photophysical, device and design aspects

Joshi, Dhruv; Shivanna, Ravichandran; Narayan, K. S. (Taylor & Francis Ltd, 2014)

Key aspects of Organic Photovoltaics (OPVs) have been reviewed in this tutorial. Issues pertaining to the choice of materials, fabrication processes, photophysical mechanisms, device characterization, morphology of active ...
Fabrication of Single Si Nanowire Metal-Semiconductor-Metal Device for Photodetection

Das, Kaustuv; Samanta, Sudeshna; Kumar, Prashant; Narayan, K. S.; Raychaudhuri, Arup Kumar (IEEE-Inst Electrical Electronics Engineers Inc, 2014)

The photoresponse of a metal-semiconductor-metal (MSM) device using single silicon nanowire (Si NW) (similar to 50-nm diameter) with responsivity approaching 3 A/W and external quantum efficiency similar to 900% at a ...
Improved Performance of Solution-Processed n-Type Organic Field-Effect Transistors by Regulating the Intermolecular Interactions and Crystalline Domains on Macroscopic Scale

Vasimalla, Suresh; Senanayak, Satyaprasad P.; Sharma, Meenakshi; Narayan, K. S.; Iyer, Parameswar Krishnan (American Chemical Society, 2014)

The development of four new n-channel naphthalene diimide (NDI) and perylene diirnide (PDI) copolymers (NDI-Ph, NDI-BT, PDI-Ph, and PDI-BT) and their solution processed thin film transistor (TFT) devices are reported. ...
Polymer optoelectronic structures for retinal prosthesis

Gautam, Vini; Narayan, K. S. (Taylor & Francis Inc, 2014)

This commentary highlights the effectiveness of optoelectronic properties of polymer semiconductors based on recent results emerging from our laboratory, where these materials are explored as artificial receptors for ...
Single CuTCNQ charge transfer complex nanowire as ultra high responsivity photo-detector

Basori, Rabaya; Das, K.; Kumar, Prashant; Narayan, K. S.; Raychaudhuri, A. K. (Optical Society American, 2014)

We report ultra large photo responsivity R (ratio of photo-generated current to absorbed power) in a single nanowire (NW) device made from a single strand of a nanowire (diameter similar to 30nm and length similar to 200nm) ...
Strategies for Fast-Switching in All-Polymer Field Effect Transistors

Senanayak, Satyaprasad P.; Narayan, K. S. (Wiley-V C H Verlag Gmbh, 2014)

Low-cost printable field effect transistors (FETs) are typically associated with slow switching characteristics. Dynamic response of polymer field effect transistors (PFETs) is a manifestation of time scales involved in ...
Supramolecular P4VP-pentadecylphenol naphthatenebisimide comb-polymer: mesoscopic organization and charge transport properties

Narayan, Rekha; Kumar, Prashant; Narayan, K. S.; Ashe, S. K. (Royal Society of Chemistry, 2014)

A supramolecular comb polymer of pentadecyl phenol (PDP) substituted naphthalenebisimide (PDP-UNBI) with poly(4-vinylpyridine) (P4VP) is reported. The mesoscopic organization within the P4VP(PDP-UNBI), complexes was studied ...
Nanostructured Donor-Acceptor Self Assembly with Improved Photoconductivity

Saibal, B.; Ashar, A. Z.; Devi, R. Nandini; Narayan, K. S.; Asha, S. K. (American Chemical Society, 2014)

Nanostructured supramolecular donor-acceptor assemblies were formed when an unsymmetrical N-substituted pyridine functionalized perylenebisimide (UPBI-Py) was complexed with oligo(p-phenylenevinylene) (OPVM-OH) complementarily ...
Zn(II) and Cu(II) complexes of a new thiophenebased salphen-type ligand: solution-processable high-performance field-effect transistor materials

Asatkar, Ashish K.; Senanayak, Satyaprasad P.; Bedi, Anjan; Panda, Snigdha; Narayan, K. S.; Zade, Sanjio S. (Royal Society of Chemistry, 2014)

A new thiophene-based salphen-type ligand, 1, and its Cu(II) and Zn(II) complexes, 1 center dot Cu and 1 center dot Zn center dot MeOH, were designed and synthesized. These metal organic complexes (MOCs), with ultra-close ...
Luminescent Polymer Films from Simple Processing of Coronene and Europium Precursors in Water

Planells, Miquel; Klampaftis, Efthymios; Congiu, Martina; Shivanna, Ravichandran; Rao, K. Venkata; Chepelin, Oleg; Jones, Anita C.; Richards, Bryce S.; George, Subi Jacob; Narayan, K. S.; Robertson, Neil (Wiley-V C H Verlag Gmbh, 2014)

We describe the preparation and optical characterisation of a coronene tetracarboxylate salt (CS) in polyvinyl alcohol (PVA) thin film solutions processed from water, neat or mixed with varying ratios of a europium ...
Naphthalene Diimide Copolymers with Oligo(p-phenylenevinylene) and Benzobisoxazole for Balanced Ambipolar Charge Transport

Kolhe, Nagesh B.; Ashar, A. Z.; Narayan, K. S.; Asha, S. K. (American Chemical Society, 2014)

A series of alternating and random donor (D)-acceptor (A) copolymers based on naphthalene diimide (NDI) as the acceptor and oligo(p-phenylenevinylene) (OPV) or benzobisoxazole (BBO) as the strong and weak donor, respectively, ...
Charge generation and transport in efficient organic bulk heterojunction solar cells with a perylene acceptor

Shivanna, Ravichandran; Shoaee, Safa; Dimitrov, Stoichko; Kandappa, Sunil Kumar; Rajaram, Sridhar; Durrant, James R.; Narayan, K. S. (Royal Society of Chemistry, 2014)

The origin of high current density in efficient non-fullerene based bulk heterojunction (BHJ) organic solar cells employing a non-planar perylene dimer (TP) as an electron acceptor and a thiophene based donor polymer ...
A Polymer Optoelectronic Interface Provides Visual Cues to a Blind Retina

Gautam, Vini; Rand, David; Hanein, Yael; Narayan, K. S. (Wiley-V C H Verlag Gmbh, 2014)
Cu Doping in Ligand Free CdS Nanocrystals: Conductivity and Electronic Structure Study

Grandhi, G. Krishnamurthy; Swathi, K.; Narayan, K. S.; Viswanatha, Ranjani (American Chemical Society, 2014)

Ligand-free Cu-doped CdS nanocrystals (NCs) have been synthesized to elucidate their surface electronic structure. The Cu-doped ligand-free NCs unlike their undoped counterparts are shown to be luminescent. We used this ...
Interface engineering for efficient fullerene-free organic solar cells

Shivanna, Ravichandran; Rajaram, Sridhar; Narayan, K. S. (American Institute of Physics, 2015)

We demonstrate the role of zinc oxide (ZnO) morphology and addition of an acceptor interlayer to achieve high efficiency fullerene-free bulk heterojunction inverted organic solar cells. Nanopatterning of the ZnO buffer ...
Self-Assembled Nanodielectrics for High-Speed, Low-Voltage Solution-Processed Polymer Logic Circuits

Senanayak, Satyaprasad P.; Sangwan, Vinod K.; McMorrow, Julian J.; Everaerts, Ken; Chen, Zhihua; Facchetti, Antonio; Hersam, Mark C.; Marks, Tobin J.; Narayan, K. S. (Wiley-Blackwell, 2015)

Solution-processed polymer-based logic circuits are typically associated with high operating voltage and slow switching speeds. Here, polymer field-effect transistors (PFETs) fabricated on hybrid self-assembled nanodielectric ...
Charge versus Energy Transfer Effects in High-Performance Perylene Diimide Photovoltaic Blend Films

Singh, Ranbir; Shivanna, Ravichandran; Iosifidis, Agathaggelos; Butt, Hans-Juergen; Floudas, George; Narayan, K. S.; Keivanidis, Panagiotis E. (American Chemical Society, 2015)

Perylene dimide (PDI)-based organic photovoltaic devices can potentially deliver high power conversion efficiency values provided the photon energy absorbed is utilized efficiently in charge transfer (CT) reactions instead ...
Noise spectroscopy of polymer transistors

Harsh, Rishav; Narayan, K. S. (American Institute of Physics, 2015)

Noise studies constitute an important approach to study polymer based field effect transistors (FETs) from the perspective of disorder physics as well as device application. The current fluctuations in an all organic ...

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