Mohit Tuteja

National Institute of Standards and Technology

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Angus Rockett

University of Illinois Urbana-Champaign

Scott MacLaren

University of Illinois Urbana-Champaign

R. W. Collins

University of Toledo

Prakash Koirala

Clemson University

Vasilios Palekis

University of South Florida

Chris Ferekides

University of South Florida

Antonio B. Mei

HRL Laboratories (United States)

Andrea Centrone

National Institute of Standards and Technology

Davide G. Sangiovanni

Linköping University

A. J. Hall

University of Illinois Urbana-Champaign

Cooperative Institutions

University of Illinois Urbana-Champaign

University of Illinois System

Center for Nanoscale Science and Technology

Linköping University

Thinfilm (Sweden)

National Taiwan University of Science and Technology

Goodwin College

University of Maryland, College Park

Jawaharlal Nehru Centre for Advanced Scientific Research

Urbana University

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Growth, nanostructure, and optical properties of epitaxial VN_x/MgO(001) (0.80 ≤ x ≤ 1.00) layers deposited by reactive magnetron sputtering

Journal of Materials Chemistry C (2016)

Antonio B. Mei Mohit Tuteja Davide G. Sangiovanni Richard T. Haasch Angus Rockett

VN_x/MgO(001) layers (1.0 ≥x≥ 0.80) are characterized using structural-analyses, photoemission, ellipsometry, and theory; results show N-vacancies, the primary defects, are non-interacting.

Cavity magnetron

10.1039/c6tc02289h

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Citations (31)

Nanostructured Lipid‐Based Films for Substrate‐Mediated Applications in Biotechnology

Advanced Functional Materials (2018)

Minjee Kang Mohit Tuteja Andrea Centrone Daniel Topgaard Cecília Leal

Abstract Amphiphilic in nature, lipids spontaneously self‐assemble into a range of nanostructures in the presence of water. Among lipid self‐assembled structures, liposomes and supported lipid bilayers have long held scientific interest for their main applications in drug delivery and plasma membrane models, respectively. In contrast, lipid‐based multilayered membranes on solid supports only recently begin drawing scientists' attention. Current studies show that the stacking of multiple bilayers on a solid support yields cooperative structural and dynamic behavior that enables new functionalities. Lipid films provide compartmentalization, templating, and enhanced release of molecules of interest. Importantly, supported lipid phases exhibit long‐range periodic nanoscale order and orientation that is tunable in response to a changing environment. Herein, the current understanding of lipid‐based film research is summarized focusing on how unique structural characteristics enable the emergence of new applications including label‐free biosensors, macroscale drug delivery, and substrate‐mediated gene delivery. The authors' recent contributions focusing on the structural characterization of lipid‐based films using small‐angle X‐ray scattering and atomic force microscopy are highlighted. In addition, new photothermally induced resonance and solid‐state nuclear magnetic resonance data are described, providing insights into drug partition in lipid‐based films as well as structure and dynamics at the molecular scale.

10.1002/adfm.201704356

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Nanoscale partitioning of paclitaxel in hybrid lipid–polymer membranes

The Analyst (2018)

Mohit Tuteja Minjee Kang Cecília Leal Andrea Centrone

Nanoscale chemical imaging reveals enhanced paclitaxel partitioning and release at lipid–polymer boundaries.

10.1039/c8an00838h

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Superstructure of self-aligned hexagonal GaN nanorods formed on nitrided Si(111) surface

Applied Physics Letters (2012)

Praveen Kumar Mohit Tuteja Manoj Kesaria U. V. Waghmare S. M. Shivaprasad

We present here the spontaneous formation of catalyst-free, self-aligned crystalline (wurtzite) nanorods on Si(111) surfaces modified by surface nitridation. Nanorods grown by molecular beam epitaxy on bare Si(111) and non-stoichiometric silicon nitride interface are found to be single crystalline but disoriented. Those grown on single crystalline Si3N4 intermediate layer are highly dense c-oriented hexagonal shaped nanorods. The morphology and the self-assembly of the nanorods shows an ordered epitaxial hexagonal superstructure, suggesting that they are nucleated at screw dislocations at the interface and grow spirally in the c-direction. The aligned nanorod assembly shows high-quality structural and optical emission properties.

Nanorod

Wurtzite crystal structure

Superstructure

Stoichiometry

10.1063/1.4751986

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High-Q dark hyperbolic phonon-polaritons in hexagonal boron nitride nanostructures

Nanophotonics (2020)

Georg Ramer Mohit Tuteja Joseph R. Matson Marcelo Davanço Thomas G. Folland

The anisotropy of hexagonal boron nitride (hBN) gives rise to hyperbolic phonon-polaritons (HPhPs), notable for their volumetric frequency-dependent propagation and strong confinement. For frustum (truncated nanocone) structures, theory predicts five, high-order HPhPs, sets, but only one set was observed previously with far-field reflectance and scattering-type scanning near-field optical microscopy. In contrast, the photothermal induced resonance (PTIR) technique has recently permitted sampling of the full HPhP dispersion and observing such elusive predicted modes; however, the mechanism underlying PTIR sensitivity to these weakly-scattering modes, while critical to their understanding, has not yet been clarified. Here, by comparing conventional contact- and newly developed tapping-mode PTIR, we show that the PTIR sensitivity to those weakly-scattering, high-Q (up to ≈280) modes is, contrary to a previous hypothesis, unrelated to the probe operation (contact or tapping) and is instead linked to PTIR ability to detect tip-launched dark, volumetrically-confined polaritons, rather than nanostructure-launched HPhPs modes observed by other techniques. Furthermore, we show that in contrast with plasmons and surface phonon-polaritons, whose Q-factors and optical cross-sections are typically degraded by the proximity of other nanostructures, the high-Q HPhP resonances are preserved even in high-density hBN frustum arrays, which is useful in sensing and quantum emission applications.

Hexagonal boron nitride

Nanomaterials

10.1515/nanoph-2020-0048

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Citations (13)

Low temperature photoluminescence studies on sputter deposited cadmium sulphide/cadmium telluride heterojunctions and solar cells

Mohit Tuteja

Cadmium telluride photovoltaics

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CdCl₂ Treatment-Induced Enhanced Conductivity in CdTe Solar Cells Observed Using Conductive Atomic Force Microscopy

The Journal of Physical Chemistry Letters (2016)

Mohit Tuteja Antonio B. Mei Vasilios Palekis A. J. Hall Scott MacLaren

The rear surfaces of CdTe photovoltaic devices without back contacts, grown by close-spaced sublimation (CSS), were analyzed using conductive atomic force microscopy (C-AFM). As-deposited and CdCl2-treated CdTe samples were compared to clarify the effect of the treatment on charge flow through grains and grain boundaries. The CdCl2-treated samples exhibit a more homogeneous and enhanced current flow across the grains as compared to the as-deposited samples. The grain boundaries show variable current. Under high bias, grain boundaries dominate current flow when the main junction is reverse biased and with the conducting current in reverse breakdown. Under the opposite bias conditions, where the contact of the conductive tip to the surface is reverse biased and under breakdown conditions, the current flow is uniform with little contrast between grains and grain boundaries. The results are interpreted as resulting from the improved crystallinity of the CdTe with reduced p-type doping along the grain boundaries.

Cadmium telluride photovoltaics

Sublimation

10.1021/acs.jpclett.6b02399

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Measuring relative carrier concentrations at the nanoscale using scanning microwave impedance microscopy: The case of CdTe solar cells

Mohit Tuteja Prakash Koirala Vasilios Palekis Scott MacLaren Christos Ferekides

We present scanning microwave impedance microscopy as an analysis technique that can be used to map the relative carrier concentrations at the nanoscale in the semiconductors used for device applications. The specific application presented here is the analysis of PV-device grade CdTe, grown using rf-sputtering and close-spaced sublimation (CSS). We demonstrate a direct observation of carrier depletion along the grain boundaries in CdTe caused due to the CdCl ₂ annealing treatment, which is an important step in the device manufacture process.

Cadmium telluride photovoltaics

Sublimation

10.1109/pvsc.2016.7750293

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Low temperature photoluminescence spectroscopy studies on sputter deposited CdS/CdTe junctions and solar cells

Journal of materials research/Pratt's guide to venture capital sources (2016)

Mohit Tuteja Prakash Koirala Julio Soares R. W. Collins Angus Rockett

Cadmium telluride photovoltaics

10.1557/jmr.2015.399

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Phonon and electron contributions to the thermal conductivity of VNx epitaxial layers

Physical Review Materials (2017)

Qiye Zheng Antonio B. Mei Mohit Tuteja Davide G. Sangiovanni Lars Hultman

Thermal conductivities of $\mathrm{V}{\mathrm{N}}_{x}/\mathrm{MgO}$(001) ($0.76\ensuremath{\le}x\ensuremath{\le}1.00$) epitaxial layers, grown by reactive magnetron sputter deposition, are measured in the temperature range $300

10.1103/physrevmaterials.1.065002

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Citations (42)