Prof. Anvar A. Zakhidov Profile

Prof. Anvar A. Zakhidov

Professor/Deputy Director Nanotech Institute at Univ of Texas Dallas

SPIE Involvement:

Author

Proceedings Article | 20 August 2020 Poster + Presentation + Paper

Bright perovskite light-emitting electrochemical cell utilizing CNT sheets as a tunable charge injector

Masoud Alahbakhshi, Alexios Papadimitratos, Ross Haroldson, Aditya Mishra, Artur Ishteev, Josef Velten, Qing Gu, Jason Slinker, Anvar Zakhidov

Proceedings Volume 11473, 114731N (2020) https://doi.org/10.1117/12.2567751

KEYWORDS: Perovskite, Electrodes, Lithium, Ions, Carbon nanotubes, Cesium, Thin films, Electroluminescence, Doping, LED lighting

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Proceedings Article | 26 February 2020 Presentation + Paper

Visible frequency active hyperbolic metamaterials

Zhitong Li, Joseph S. Smalley, Ross Haroldson, Dayang Lin, Roberta Hawkins, Abouzar Gharajeh, Jiyoung Moon, Junpeng Hou, Chuanwei Zhang, Walter Hu, Anvar Zakhidov, Qing Gu

Proceedings Volume 11289, 112891N (2020) https://doi.org/10.1117/12.2544508

KEYWORDS: Gold, Perovskite, Dielectric polarization, Absorption, Dielectrics, Metamaterials, Metals, Electro optical imaging, Nanoimprint lithography, Visible radiation

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Proceedings Article | 4 May 2018 Paper

Photoluminescence behavior of nanoimprinted halide perovskite at low temperatures

Zarina Sadrieva, Ekaterina Tiguntseva, Yuriy Kapitonov, Qing Gu, Walter Hu, Sergey Makarov, Andrey Bogdanov, Anvar Zakhidov

Proceedings Volume 10672, 106724I (2018) https://doi.org/10.1117/12.2309359

KEYWORDS: Perovskite, Glasses, Luminescence, Nanoimprint lithography, Excitons, Planar waveguides

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Proceedings Article | 16 June 2017 Presentation

Carbon nanotube charge collectors for nanoimprinted hybrid perovskite photovoltaics (Conference Presentation)

Anvar Zakhidov, Ross Haroldson, Danila Saranin, Patricia Martinez, Artur Ishteev

Proceedings Volume 10248, 102480M (2017) https://doi.org/10.1117/12.2267057

KEYWORDS: Perovskite, Interfaces, Spectroscopy, Solar cells, Excitons, Diffusion, Carbon nanotubes, Photovoltaics, Crystals, Semiconductors

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The hybrid (organo-inorganic) lead-halide perovskites revolutionized the field of solar cell research due to the impressive power conversion efficiencies of up to 21% recently reported in perovskite based solar cells. This talk will present first the general concepts of excitonic photovoltaics, as compared to conventional Si-type solar cells, asking a question: is hybrid perovskite PV an excitonic solar cell or not? Do we need excitons dissociation at D-A interfaces or CNT charge collectors? Then I will show our recent experimental results on the fast spectroscopy of excitons, magnetic field effect on generation of correlated (e-h) pairs. Also will discuss our Hall effect results, that allows to evaluate intrinsic charge carrier transport and direct measurements of mobility in these materials performed for the first time in steady-state dc transport regime. From these measurements, we have obtained the electron-hole recombination coefficient, the carrier diffusion length and lifetime. Our main results include the intrinsic Hall carrier mobility reaching up to 60 cm2V-1s^-1 in perovskite single crystals, carrier lifetimes of up to 3 ms (surprisingly too long!), and carrier diffusion lengths as long as 650 μm (huge if compared to organic and even best inorganic materials). Our results also demonstrate that photocarrier recombination in these disordered solution-processed perovskites is as weak as in the best (high-purity single crystals) of conventional direct-band inorganic semiconductors. Moreover, as we show in our experiment, carrier trapping in perovskites is also strongly suppressed, which accounts for such long carrier lifetimes and diffusion lengths, significantly longer than similar parameters in the best inorganic semiconductors, such e.g. as GaAs. All these remarkable transport properties of hybrid perovskites need to be understood from fundamental physics point of view. Looks like we need some new concepts to explain the mysterious properties of “protected” hybrid perovskites. We suggest that some of this unusual properties can be attributed to a special type of “dipole rotational polaron” formed in their lattice due to interactions of charge with methyl-ammonium organic dipoles, each of 2.3 Debye. Examples of perovskite solar cell with transparent CNT charge collectors will demonstrated the 3 D charge collection in the monolithic tandems of perovskite PV with other dissimilar materials PVs, such as OPV and inorganic PV. We describe the pioneering methods to create highly transparent CNT sheets by dry lamination from vertically alligned CVD forests of MWCNTs. Transparency can be further increased by converting CNT aerogels into locally collapsed meshs with micron scale oppenings by spraying Ag nanowires, which lowers sheet resistance to values of Rsh< 40 ohm/sq. such AgNW@CNT transparent sheets are ideal interlayers in three terminal tandems of perovskite PV with polymeric OPV and/or inorganic solar cells. We show that nanoimprinting can further improve the performance of perovskite photodetectors and optoelectronic devices

Proceedings Article | 6 March 2013 Open Access

Effects of nanostructure geometry on polymer chain alignment and device performance in nanoimprinted polymer solar cell

Yi Yang, Kamil Mielczarek, Anvar Zakhidov, Walter Hu

Proceedings Volume 8622, 862211 (2013) https://doi.org/10.1117/12.2008394

KEYWORDS: Nanostructures, Solar cells, Polymers, Crystals, Nanoimprint lithography, Thin films, Molecules, Organic photovoltaics, Crystallography, Absorption

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SPIE Journal Paper | 1 February 2010

Negative refraction in the visible spectrum in photonic crystals: search for focusing by fluorescent quantum dots inside synthetic opals

Rabia Moussa, Alexander Kuznetzov, Erica Neiser, April Roberson, Anvar Zakhidov

JNP, Vol. 4, Issue 01, 043503, (February 2010) https://doi.org/10.1117/12.10.1117/1.3334878

KEYWORDS: Negative refraction, Interfaces, Microscopes, Photonic crystals, Confocal microscopy, Refractive index, Glasses, Quantum dots, Visible radiation, Silica

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Proceedings Article | 5 March 2008 Paper

All-optical logical gates built on optically linear bandgap structures covered with nonlinear material

Eugene Ya. Glushko, A. Zakhidov

Proceedings Volume 7009, 70091Q (2008) https://doi.org/10.1117/12.795367

KEYWORDS: Nonlinear optics, Signal processing, Photonic crystals, Reflection, Waveguides, Glasses, Refractive index, Complex systems, Binary data, Switching

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Proceedings Article | 9 October 2005 Paper

Cathodoluminescence and electroluminescence from multilayered organic structures induced by field electron emission from carbon nanotubes

Alexander Kuznetzov, Alexander Zakhidov, Raquel Ovalle, Rashmi Nanjundaswami, Christopher Williams, Mei Zhang, Sergey Lee, John Ferraris, Anvar Zakhidov

Proceedings Volume 5937, 593720 (2005) https://doi.org/10.1117/12.617876

KEYWORDS: Electroluminescence, Carbon nanotubes, Organic light emitting diodes, Electrodes, Electron beams, Ionization, Thin films, Organic materials, Excitons, Charged particle optics

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Proceedings Article | 4 October 2005 Paper

Nanocomposite solar cells based on conjugated polymers and PbSe quantum dots

Xiaomei Jiang, Sergey Lee, Igor Altfeder, Anvar Zakhidov, Richard Schaller, Jeff Pietryga, Victor Klimov

Proceedings Volume 5938, 59381F (2005) https://doi.org/10.1117/12.619361

KEYWORDS: Polymers, Infrared radiation, Solar cells, Quantum dots, Absorption, Nanocomposites, Infrared photography, Luminescence, Photovoltaics, Nanocrystals

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Proceedings Article | 3 November 2004 Paper

Optimization of postproduction heat treatment for plastic solar cells

Kanzan Inoue, Ross Ulbricht, Pallavi Madakasira, William Sampson, Sergey Lee, Jose Gutierrez, John Ferraris, Anvar Zakhidov

Proceedings Volume 5520, (2004) https://doi.org/10.1117/12.593476

KEYWORDS: Heat treatments, Solar cells, Absorption, Composites, Polymers, Annealing, Organic photovoltaics, Molecules, Photovoltaics, Glasses

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Proceedings Article | 14 April 2003 Paper

Electromagnetic field structure and quenching in one-dimensional photonic crystals

Eugene Glushko, Svetlana Legusha, Anvar Zakhidov

Proceedings Volume 5065, (2003) https://doi.org/10.1117/12.502178

KEYWORDS: Photonic crystals, Electromagnetism, Reflection, Crystals, Quenching (fluorescence), Dielectrics, Mirrors, Electromagnetic radiation, Interfaces, Birefringence

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Proceedings Article | 18 December 2002 Paper

Excitations in opal photonic crystals infiltrated with polarizable media

Nayer Eradat, A. Sivachenko, Mikhail Raikh, Z. Valy Vardeny, Anvar Zakhidov, S. Li, Ray Baughman

Proceedings Volume 4798, (2002) https://doi.org/10.1117/12.458241

KEYWORDS: Reflectivity, Dielectrics, Molecules, Photonic crystals, Dispersion, Silica, Optical spheres, Photon polarization, Physics, Crystals

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Proceedings Article | 17 December 1999 Paper

Stimulated emission and lasing in -conjugated polymer films, microstructures, and opal photonic crystals

Z. Valy Vardeny, Sergey Frolov, Douglas Chinn, Maxim Shkunov, Werner Gellermann, Katsumi Yoshino, Akihiko Fujii, Richard Gregory, Ray Baughman, Anvar Zakhidov

Proceedings Volume 3797, (1999) https://doi.org/10.1117/12.372698

KEYWORDS: Polymers, Polymer thin films, Optical fibers, Microrings, Absorption, Optical microcavities, Thin films, Light emitting diodes, Excitons, Light scattering

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Proceedings Article | 8 December 1995 Paper

Photonics of fullerene-conducting polymer composites and multilayered structures: new results and prospects

Katsumi Yoshino, Kenji Yoshimoto, Kazuya Tada, Hishashi Araki, Tsuyoshi Kawai, Masanori Ozaki, Anvar Zakhidov

Proceedings Volume 2530, (1995) https://doi.org/10.1117/12.228125

KEYWORDS: Interfaces, Electrons, Polymers, Composites, Photons, Electroluminescence, Molecules, Doping, Electrodes, Polarons

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Showing 5 of 14 publications

Conference Committee Involvement (1)

Nanotechnology VIII

8 May 2017 | Barcelona, Spain

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