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Study and develoment of organic LEDs, solar cells, thin-film transistors and sensors based on semiconductor polymers

Grant number: 09/05589-7
Support type:Regular Research Grants
Duration: September 01, 2009 - May 31, 2012
Field of knowledge:Engineering - Electrical Engineering - Electrical Materials
Principal researcher:Adnei Melges de Andrade
Grantee:Adnei Melges de Andrade
Home Institution: Instituto de Energia e Ambiente (IEE). Universidade de São Paulo (USP). São Paulo , SP, Brazil


This project deals with the R&D of Polymer Light Emitting Devices(PLEDs), Organic Solar Cells(CSOs), Organic Thin-Film Transistors(OTFTs) and sensors based on conjugated polymers. In a great measure, the project is a continuation of the Project FAPESP 03/07454-5 which has resulted in several M.Sc. dissertations and Ph.D. thesis, as related by our project reports and synthesized in this new project. In this new phase of the GEM group (Grupo de Eletrônica Molecular), thin-films of different conjugated polymers, like poly(p-phenilenevinylidene) and derivatives, polyfluorene, polythiophene, as well as other polymeric hosts with rare earth and transition metal complexes will be deposited by different techniques like spin-coating, casting, ink-jet and self-assembly so as to be used as active elements in organic electronic devices. Morphology and chemical structure of the films will be characterized by UV-Vis and FT-IR spectroscopy, photoluminescence, scanning electron microscopy and atomic force microscopy. The thin-film electrical properties will be investigated by alternating and direct current electrical conductivity measurements. In the case of films for LED devices, light emission intensity so to obtain figure of merit of luminous efficacy (hL, in cd/A), luminous power efficiency (hP, in lm/W) and the external quantum efficiency (EQE). LEDs and solar cells will be produced in a controlled atmosphere chamber to avoid the degradation problems associated with the conjugated polymers when exposed to the open ambient. Emphasis will be put on the White LED emission for the enormous potential they offer to substitute the conventional fluorescent and incandescent bulbs lighting. With this Project it is expected to obtain polymeric electronic devices with controlled properties, more efficient and with a longer useful life. Moreover, it is expected to better understand the injection mechanisms, transport and recombination of the charge carriers on those materials. (AU)

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Scientific publications (6)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
CAVALLARI, MARCO R.; BRAGA, GUILHERME S.; DA SILVA, MAURO F. P.; IZQUIERDO, JOSE E. E.; PATERNO, LEONARDO G.; DIRANI, ELY A. T.; KYMISSIS, IOANNIS; FONSECA, FERNANDO J. A Hybrid Electronic Nose and Tongue for the Detection of Ketones: Improved Sensor Orthogonality Using Graphene Oxide-Based Detectors. IEEE SENSORS JOURNAL, v. 17, n. 7, p. 1971-1980, APR 1 2017. Web of Science Citations: 9.
CAVALLARI, MARCO R.; ZANCHIN, VINICIUS R.; VALLE, MARCIO A.; IZQUIERDO, JOSE. E.; RODRIGUEZ, EDUARDO M.; RODRIGUEZ, ESTRELLA F. G.; PEREIRA-DA-SILVA, MARCELO A.; FONSECA, FERNANDO J. On the Performance Degradation of Poly(3-Hexylthiophene) Field-Effect Transistors. IEEE TRANSACTIONS ON DEVICE AND MATERIALS RELIABILITY, v. 15, n. 3, p. 342-351, SEP 2015. Web of Science Citations: 2.
DOS SANTOS, GERSON; CAVALLARI, MARCO ROBERTO; FONSECA, FERNANDO JOSEPETTI. A Comparative Study on the Optimization of a Ternary P3HT:PCBM:Pentacene Active Layer in Bulk Heterojunction Organic Solar Cells. JOURNAL OF SOLAR ENERGY ENGINEERING-TRANSACTIONS OF THE ASME, v. 137, n. 4 AUG 2015. Web of Science Citations: 1.
CAVALLARI, MARCO R.; IZQUIERDO, JOSE E. E.; BRAGA, GUILHERME S.; DIRANI, ELY A. T.; PEREIRA-DA-SILVA, MARCELO A.; RODRIGUEZ, ESTRELLA F. G.; FONSECA, FERNANDO J. Enhanced Sensitivity of Gas Sensor Based on Poly(3-hexylthiophene) Thin-Film Transistors for Disease Diagnosis and Environment Monitoring. SENSORS, v. 15, n. 4, p. 9592-9609, APR 2015. Web of Science Citations: 19.
CAVALLARI, MARCO ROBERTO; ZANCHIN, VINICIUS RAMOS; POJAR, MARIANA; SEABRA, ANTONIO CARLOS; PEREIRA-DA-SILVA, MARCELO DE ASSUMPCAO; FONSECA, FERNANDO JOSEPETTI; DE ANDRADE, ADNEI MELGES. Molds and Resists Studies for Nanoimprint Lithography of Electrodes in Low-Voltage Polymer Thin-Film Transistors. JOURNAL OF ELECTRONIC MATERIALS, v. 43, n. 5, p. 1317-1325, MAY 2014. Web of Science Citations: 5.
AMORIM, C. A.; CAVALLARI, M. R.; SANTOS, G.; FONSECA, F. J.; ANDRADE, A. M.; MERGULHAO, S. Determination of carrier mobility in MEH-PPV thin-films by stationary and transient current techniques. Journal of Non-Crystalline Solids, v. 358, n. 3, p. 484-491, FEB 1 2012. Web of Science Citations: 42.

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