Prof. Ivo A. Hümmelgen Lattes curriculum vitae, Research Gate Google Scholar Departamento de Física Universidade Federal do Paraná Caixa Postal 19044 81531-980 - Curitiba PR,  Brazil E-mail: iah@fisica.ufpr.br Phone/Fax: ++55 - 41 - 33613645 Education: BSc: Federal University of Paraná, Brazil, 1985 MSc: University of São Paulo - São Carlos, Brazil, 1987  DSc: University of Göttingen, Germany, 1991

RESEARCH INTERESTS:

Hybrid and all-organic transistors (FETs, V-FETs, vertical structures). Chemical sensors, pressure sensors, humidity sensors. Hybrid and organic photovoltaic devices. Charge carrier injection and transport in conjugated molecules, polymers and blends. Organic memories. Organic thermoelectrics

THE GROUP

Post-Doctoral collaborators

Dr. Isidro Cruz-Cruz

PhD Students:

Adriano de Souza Silva

Ali Nawaz

Ana Carolina B. Tavares

Anderson Hoff

Elton Alves de Moura

Rafael Rodrigues

MSc Students

Marcelo Henrique Penteado

FINANCIAL SUPPORT: CAPES, CNPq, FINEP.

OPPORTUNITIES: Fellowship opportunities for MSc/PhD/Post-doctoral studies in Brazil

Brazilian PEC-PG program: for students with Portuguese language knowledge

TWAS/CNPq Fellowships for PhD/Post-doctoral studies in Brazil

Fellowships of the OAS - Organization of the American States

"Science withouth Borders" program

CNPq regular post-doctoral fellowships

RECENT PUBLICATIONS

2017

Morphological, optical and electrical properties of GaSe₉ films and its application in photovoltaic devices.

Journal of Materials Science. Materials in Electronics, v. 28, p. 2241-2249, 2017.

Hollow carbon spheres and a hollow carbon sphere/polyvinylpyrrolidone composite as ammonia sensors.

Journal of Materials Chemistry A, v. 5, p. 2539-2549, 2017.

Organic electronic solid state device: electrochemistry of material preparation.

Journal of Solid State Electrochemistry, v. 21, p. 1977-1985, 2017.

Polymer-dielectric molecular interactions in defect-free poly(3-hexylthiophene): dependence and consequences of regioregularity on transistor charge transport properties.

Semiconductor Science and Technology, v. 32, p. 084003, 2017.

Influence of an interfacial cesium oxide thin layer in the performance and internal dynamic processes of GaSe 9 solar cells.

Solar Energy Materials and Solar Cells, v. 171, p. 1-7, 2017.

Enhancement of P3HT organic photodiodes by the addition of a GaSe ₉ alloy thin layer.

Semiconductor Science and Technology, v. 32, p. 085008, 2017.

Ultra-high mobility in defect-free poly(3-hexylthiophene-2,5-diyl) field-effect transistors through supra-molecular alignment.

Organic Electronics, v. 51, p. 94-102, 2017.

2016

Tristimulus analysis for sensors set with either positive or negative sensitivities - determination of the relative concentration of an analyte in a binary mixture.

Journal of Solid State Electrochemistry, v. 20, p. 1295-1301, 2016.

Electronic and optical properties of amorphous GaSe thin films.

Journal of Materials Science. Materials in Electronics, v. 27, p. 7379-7383, 2016.

Electrode material dependent p- or n-like thermoelectric behavior of single electrochemically synthesized poly(2,2 -bithiophene) layer application to thin film thermoelectric generator.

Journal of Solid State Electrochemistry, v. 20, p. 2191-2196, 2016.

Colloidal InSe nanostructures: Effect of morphology on their chemical sensitivity to methanol and formaldehyde fumes.

Sensors and Actuators. B, Chemical, v. 236, p. 116-125, 2016.

EXAFS investigations on amorphous GaSe₉ thin films.

Journal of Non-Crystalline Solids, v. 447, p. 233-237, 2016.

High mobility organic field-effect transistors based on defect-free regioregular poly(3-hexylthiophene-2,5-diyl).

Organic Electronics, v. 38, p. 89-96, 2016.

Poly(Vinyl Alcohol) Gate Dielectric Treated With Anionic Surfactant in C60 Fullerene-Based n-Channel Organic Field Effect Transistors. Materials Research, v. 19, p. 1201-1206, 2016.

Fungi Active Microbial Metabolism Detection of Rhizopus sp. and Aspergillus sp. Section Nigri on Strawberry Using a Set of Chemical Sensors Based on Carbon Nanostructures.

Chemosensors, v. 4, p. 19, 2016.

Distinguishing between organic and pesticide treated strawberries using a chemical sensor array.

International Journal of Electroactive Materials, v. 4, p. 27-32, 2016.

2015

Poly(3-hexylthiophene-2,5-diyl) Based Field Effect Transistors Performance Enhancement through Surfactant Treatment of the Poly(vinyl alcohol) Gat e Insulator Surface.

Physical Chemistry Chemical Physics, v. 17, p. 26530-26534, 2015.

Poly(vinyl alcohol) gate dielectric surface treatments with vitamin C for poly(3-hexylthiophene-2,5-diyl) based field effect transistors performance improvement.

Organic Electronics, v. 17, p. 22-27, 2015.

Non-destructive tomato ripeness determination using carbon nanostructure based chemical sensors.

Application of tristimulus and principal component analysis methods. International Journal of Electroactive Materials, v. 3, p. 10-14, 2015.

A surfactant dispersed N-doped carbon sphere-poly(vinyl alcohol) composite as relative humidity sensor.

Journal of Materials Science. Materials in Electronics, v. 26, p. 4198-4201, 2015.

An additional tool towards overcoming absence of specificity of carbon nanostructure-based electrochemical sensors application to estriol and estradiol detection and distinction.

Journal of Solid State Electrochemistry, v. 19, p. 3045, 2015.

Modification of the charge transport properties of the copper phthalocyanine/poly(vinyl alcohol) interface using cationic or anionic surfactant for field-effect transistor performance enhancement.

Journal of Physics. D, Applied Physics, v. 48, p. 335104, 2015.

Copper phthalocyanine based vertical organic field effect transistor with naturally patterned tin intermediate grid electrode

Organic Electronics, v. 27, p. 155-159, 2015.

Improved charge carrier mobility in copper phthalocyanine based field effect transistors by insertion of a thin poorly conducting layer as gate insulator extension.

Physica Status Solidi. A, Applications and Materials Science, v. 212, p. 2759-2765, 2015.

2014

Carbon nanostructures in organic WORM memories.

Journal of Materials Chemistry C v. 2, p. 7708, 2014.

SeP hole injection layer for devices based on organic materials.

Journal of Physics. D, Applied Physics v. 47, p. 015304, 2014.

Structural and Optical properties of ZnO films produced by a Modified Ultrasonic Spray Pyrolysis Technique.

Thin Solid Films, v. 555, p. 13-18, 2014.

Interfacial insertion of a poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) layer between the poly(3-hexyl thiophene) semiconductor and cross-linked poly(vinyl alcohol) insulator layer in organic field-effect transistors.

Journal of Physics. D, Applied Physics, v. 47, p. 075102, 2014.

Hydrostatic pressure sensors based on carbon spheres dispersed in polyvinyl alcohol prepared using hexadecyltrimethylammonium bromide as surfactant and water as solvent.

Materials Research Express, v. 1, p. 015605, 2014.

All-organic vertical transistor in an analogous n-semiconductor/metal/p-semiconductor trilayer structure.

Organic Electronics, v. 15, p. 738, 2014.

2013

Tristimulus mathematical treatment application for monitoring fungi infestation evolution in melon using the electrical response of carbon nanostructure-polymer composite based sensors.

Sensors and Actuators. B, Chemical, v. 188C, p. 378-384, 2013.

GaN nanostructures-poly(vinyl alcohol) composite based hydrostatic pressure sensor device.

Materials Chemistry and Physics, v. 143, p. 367-372, 2013.

Undoped, nitrogen-doped and boron-doped multiwalled carbon nanotube/poly(vinyl alcohol) composite as active layer in simple hydrostatic pressure sensors.

Journal of Materials Science. Materials in Electronics, v. 24, p. 3995-4000, 2013.

Performance of hybrid -type vertical transistors with poly(vinylcarbazole) as emitter and the transfer mechanism of charge carriers through the base.

Semiconductor Science and Technology, v. 28, p. 115001, 2013.

Determination of electron and hole mobility in poly(3-hexylthiophene) using space-charge-limited-current measurements,

International Journal of Electroactive Materials, v. 1, p. 60-63, 2013.

Study of poly (3-hexylthiophene)/cross-linked poly (vinyl alcohol) as semiconductor/insulator for application in low voltage organic field effect transistors,

Journal of Applied Physics 113, 214509

Functionalized Spherical Carbon Nanostructure/Poly (vinylphenol) Composites for Application in Low Power Consumption Write-Once-Read-Many Times Memories,

Journal of Nanoscience and Nanotechnology 13 (8), 5680-5686

Polymer composite of poly(vinyl phenol)-reduced graphene oxide reduced by vitamin C in low energy consuming write-once read-many times memory devices,

Organic Electronics, v. 14, p. 175-181, 2013.

Vertical organic field effect transistor using sulfonated polyaniline/aluminum bilayer as intermediate electrode,

Journal of Materials Science: Materials in Electronics 24 (3), 1052-1056

Nitrogen-doped, boron-doped and undoped multiwalled carbon nanotube/polymer composites in WORM memory devices,

Nanotechnology 24 (12), 125203

Polarized vibrational spectra of Prussian Blue films: Spectroscopic evidence of columnar growth. Vibrational Spectroscopy,

Vibrational Spectroscopy (Print), v. 64, p. 58, 2013.

Undoped, nitrogen-doped and boron-doped multiwalled carbon nanotube/poly(vinyl alcohol) composite as active layer in simple hydrostatic pressure sensors,

Materials in Electronics, v. 13, p. 5680-5686, 2013.

2012

Low voltage organic field effect transistors with a poly (hexylthiophene)–ZnO nanoparticles composite as channel material, WS Machado, IA Hümmelgen, physica status solidi (RRL)-Rapid Research Letters 6 (2), 74-76.

The OFF to ON switching time and ON state consolidation in write-once-read-many-times memory devices based on doped and undoped carbon-sphere/polymer composites, WS Machado, MA Mamo, NJ Coville, IA Hümmelgen, Thin Solid Films 520 (13), 4427-4431.

Changing inter-molecular spin-orbital coupling for generating magnetic field effects in phosphorescent organic semiconductors, Yan, L. ; Shao, M. ; Graeff, C. F. O. ; Hummelgen, I. ; MA, D. ; Hu, B., Applied Physics Letters, v. 100, p. 013301, 2012.

A comparative study on hydrostatic pressure response of sensors based on N-doped, B-doped and undoped carbon-sphere poly (vinyl alcohol) composites, MA Mamo, WS Machado, NJ Coville, IA Hümmelgen, Journal of Materials Science: Materials in Electronics 23 (7), 1332-1337.

Organic low voltage rewritable memory device based on PEDOT: PSS/f-MWCNTs thin film, JA Ávila Niño, WS Machado, AO Sustaita, E Segura-Cardenas, M Reyes-Reyes, R. Lopez-Sandoval, I. A. Hümmelgen, Organic Electronics v. 13, p. 2582-2588, 2012.

Investigation of deep-level defects in conductive polymer on n-type 4H- and 6H-silicon carbide substrates using I-V and deep level transient spectroscopy techniques, J. F. Fekix ; M. Aziz ; Seidel, K. F. ; Hümmelgen, I. A. ; E. F. da Silva Jr ; M. Henini . Journal of Applied Physics, v. 112, p. 014505, 2012.

Low-Voltage Poly(3-Hexylthiophene)/Poly(Vinyl Alcohol) Field-Effect Transistor and Inverter, Machado, W. S. ; I. A. Hümmelgen, I.E.E.E. Transactions on Electron Devices, v. 59, p. 1529-1533, 2012.

Electronic Detection of Drechslera sp Fungi in Charentais Melon (Cucumis melo Naudin) Using Carbon-Nanostructure-Based Sensors. M. W. C. C. Greenshields ; Mamo, M. A. ; N. J. Coville ; Spina, A. P. ; Rosso, D. F. ; Latocheski, E. C. ; Destro, J. G. ; Pimentel, I. C. ; Hümmelgen, I. A., Journal of Agricultural and Food Chemistry, v. 60, p. 10420-10425, 2012.

Hybrid vertical transistor based on controlled lateral channel overflow, Ahmed, M. F. ; Seidel, K. F. ; Marchiori, C. F. N. ; Mello, R. M. Q. .; Koehler, M. ; Hummelgen, I. A. . Journal of Applied Physics, v. 112, p. 074509, 2012.

Last updated: January 12, 2015