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Endre Horvath

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Publications associées (79)

Tailoring thermal conduction in anatase TiO2

Luca Rossi, Helmuth Berger, László Forró, Jacim Jacimovic, Endre Horvath, Xavier François Mettan, Andrea Pisoni, Péter Szirmai

Thermal conductivity (κ) plays an essential role in functional devices. It is advantageous to design materials where one can tune κ in a wide range according to its function: single-crystals and nanowires of anatase polymorph of titanium dioxide, broadly u ...

Springer2019

Dry-pressed anodized titania nanotube/CH3NH3PbI3 single crystal heterojunctions: The beneficial role of N doping

László Forró, Bálint Náfrádi, Endre Horvath, Konrad Domanski, Pavao Roko Andricevic, Márton Kollár

Highly ordered, anodically grown TiO2 nanotubes on titanium supports were annealed in ammonia atmosphere in order to incorporate nitrogen doping (

2019

Pressure-induced transformation of CH3NH3PbI3: the role of the noble-gas pressure transmitting media

László Forró, Andrzej Sienkiewicz, Alla Arakcheeva, Bálint Náfrádi, Endre Horvath, Anastasiia Glushkova, Márton Kollár, Gaétan Charles Antoine Giriat

The photovoltaic perovskite, methylammonium lead triiodide [CH3NH3PbI3 (MAPbI(3))], is one of the most efficient materials for solar energy conversion. Various kinds of chemical and physical modifications have been applied to MAPbI(3) towards better unders ...

International Union of Crystallography (IUCr)2019

Differential Response of the Photoluminescence and Photocurrent of Polycrystalline CH(3)NH(3)PbI(3 )and CH3NH3PbBr3 to the Exposure to Oxygen and Nitrogen

László Forró, Andrzej Sienkiewicz, Endre Horvath, Anastasiia Glushkova, Márton Kollár, Konstantins Mantulnikovs

Because of their excellent photoelectric properties, organic-inorganic metal halide perovskites (MHPs), such as methylammonium lead triiodide, CH3NH3PbI3 (MAPbI(3)), and methylammonium lead tribromide, CH3NH3PbBr3 (MAPbBr(3)), are of great interest for the ...

2019

Effect of Thermal Cycling on the Structural Evolution of Methylammonium Lead Iodide Monitored around the Phase Transition Temperatures

László Forró, Alla Arakcheeva, Endre Horvath, Anastasiia Glushkova, Gaétan Charles Antoine Giriat, Konstantins Mantulnikovs, Konstantin Semeniuk

Optoelectronic devices and solar cells based on organometallic hybrid perovskites have to operate over a broad temperature range, which may contain their structural phase transitions. For instance, the temperature of 330 K, associated with the tetragonal-c ...

2019

Light-Emitting Electrochemical Cells of Single Crystal Hybrid Halide Perovskite with Vertically Aligned Carbon Nanotubes Contacts

László Forró, Andrzej Sienkiewicz, Bálint Náfrádi, Tonko Garma, Endre Horvath, Xavier François Mettan, Pavao Roko Andricevic, Márton Kollár

Based on the reported ion migration under an electric field in hybrid lead halide perovskites we have developed a bright, light-emitting electrochemical cell with CH3NH3PbBr3 single crystals directly grown on vertically aligned carbon nanotube forests as c ...

2019

Electron Microscopy Investigation of Coated Multiwall Carbon Nanotubes Prepared by Reactive Ball Milling

László Forró, Jin Won Seo, Klara Hernadi, Endre Horvath

Homogeneous and stable inorganic coating of SiO2, Al2O3 and TiO2 was obtained on the surface of multiwall carbon nanotubes (MWNTs) by mechanically mixing them with precursor compounds in a planetary ball mill and by subsequent hydrolysis. Detailed studies ...

AMER SCIENTIFIC PUBLISHERS2019

Morphology and Photoluminescence of CH3NH3PbI3 Deposits on Nonplanar, Strongly Curved Substrates

László Forró, Andrzej Sienkiewicz, Luka Ciric, Endre Horvath, Péter Krisztián Matus, Anastasiia Glushkova, Márton Kollár, Konstantins Mantulnikovs

2018

Structure and photocatalytic properties of sintered TiO2 nanotube arrays

László Forró, Endre Horvath

2018

Influence of the organic cation disorder on photoconductivity in ethylenediammonium lead iodide, NH3CH2CH2NH3PbI4

László Forró, Alla Arakcheeva, Bálint Náfrádi, Philip Pattison, Endre Horvath, Pavao Roko Andricevic, Anastasiia Glushkova, Márton Kollár

We report the synthesis and crystal structure of an organic–inorganic compound, ethylenediammonium lead iodide, NH3CH2CH2NH3PbI4. Synchrotron-based single crystal X-ray diffraction experiments revealed that the pristine and thermally treated crystals diffe ...

2018

Growth of CNT Forests on Titanium Based Layers, Detailed Study of Catalysts

László Forró, Klara Hernadi, Endre Horvath, Pavao Roko Andricevic

For better electrical contacts of potential devices, growth of vertically aligned carbon nanotubes (CNT forests) directly onto conductive substrates is an emerging challenge. Here, we report a systematic study on the CCVD synthesis of carbon nanotube fores ...

FRONTIERS MEDIA SA2018

Mechanical response of CH3NH3PbI3 nanowires

László Forró, Bálint Náfrádi, Martial Duchamp, Luka Ciric, Massimo Spina, Endre Horvath, Márton Kollár

AIP American Institute of Physics2018

Clean, cleaved surfaces of the photovoltaic perovskite

László Forró, Jeremy Luterbacher, Bálint Náfrádi, Henrik Moodysson Rønnow, Luka Ciric, Endre Horvath, Stefan Peter Muff, Jan Hugo Dil, Benjamin Pierre Le Monnier, Andrew Patton Weber, Márton Kollár

The surface of a material is not only a window into its bulk physical properties, but also hosts unique phenomena important for understanding the properties of a solid as a whole. Surface sensitive techniques, like ARPES (Angle-resolved photoemission spect ...

Nature Research2017

Optical detection of charge dynamics in CH3NH3PbI3/carbon nanotube composites

László Forró, Bálint Náfrádi, Endre Horvath, Pavao Roko Andricevic, Márton Kollár

We have investigated the optical absorption of metallic and semiconducting carbon nanotubes/CH3NH3PbI3 micro- and nanowire composites. Upon visible light illumination semiconducting carbon nanotube based samples show a photo-induced doping, originating fro ...

2017

Nanowires of organic-inorganic perovskites

László Forró, Massimo Spina, Endre Horvath

An organic-inorganic perovskite CH3NH3PbI3 nanowire showing a length-width aspect ratio from 5-400 up to 109 and a width-height ratio of 1-100 up to 1-10000. Further, the invention is embodied as a process for making the nanowire wherein at least a polar a ...

2017

Competitive ion-exchange of manganese and gadolinium in titanate nanotubes

László Forró, Bálint Náfrádi, Luka Ciric, Endre Horvath, Péter Szirmai, Márton Kollár

Homogeneous Mn2+ and Gd3+ intercalation of scroll-type trititanate nanotubes using a post-synthesis ion exchange method is reported. Compared to Mn2+, Gd3+ ion-exchange shows larger saturation intercalation levels. Upon co-doping, weak interactions between ...

Elsevier Science Bv2017

Cyan titania nanowires: Spectroscopic study of the origin of the self-doping enhanced photocatalytic activity

László Forró, Richard Gaal, Arnaud Magrez, Alla Arakcheeva, Bálint Náfrádi, Xavier Berdat, Jacim Jacimovic, Massimo Spina, Endre Horvath, Laurent Syavoch Bernard, Péter Szirmai

We report a detailed spectroscopic study of Ti3+ self-doped TiO2 nanowires prepared by high temperature annealing of the protonated titanate nanowires (TiONW) in hydrogen atmosphere. Hydrogenation causes a color change from white to cyan and a major increa ...

Elsevier2017

Three-Dimensionally Enlarged Photoelectrodes by a Protogenetic Inclusion of Vertically Aligned Carbon Nanotubes into CH3NH3PbBr3 Single Crystals

László Forró, Andrzej Sienkiewicz, Bálint Náfrádi, Klara Hernadi, Endre Horvath, Xavier François Mettan, Pavao Roko Andricevic, Márton Kollár

We demonstrate that single crystals of methylammonium lead bromide (MAPbBr(3)) could be grown directly on vertically aligned carbon nanotube (VACNT) forests. The fast-growing MAPbBr3 single crystals engulfed the protogenetic inclusions in the form of indiv ...

2017

Photodiode Response in a CH3NH3PbI3/CH3NH3SnI3 Heterojunction

László Forró, Bálint Náfrádi, Massimo Spina, Endre Horvath, Karoly Holczer, Andrea Pisoni

Here we report another surprising feature of the methylammonium metal halide material family, the phototunability of the diode response of a heterojunction made of CH3NH3PbI3 and its close relative, CH3NH3SnI3. In the dark state the device behaves as a dio ...

2017

Mechanical signatures of degradation of the photovoltaic perovskite CH3NH3PbI3 upon water vapor exposure

László Forró, Ayat Karimi, Wanda Andreoni, Bálint Náfrádi, Massimo Spina, Endre Horvath

We report on the mechanical properties of CH3NH3PbI3 photovoltaic perovskite measured by nanoindentation. The Young's modulus (E) of the pristine sample is 20.0 +/- 1.5GPa, while the hardness (H) is 1.0 +/- 0.1GPa. Upon extended exposure to water vapor, bo ...

2017

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