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Ricardo Vignoto Fernandes

Universidade Estadual de Londrina

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Featured researches published by Ricardo Vignoto Fernandes.

Journal of Physics D | 2017

Development of multidye UV filters for OPVs using luminescent materials

Ricardo Vignoto Fernandes; Noel Bristow; Vasil Stoichkov; Helder Scapin Anizelli; José Leonil Duarte; Edson Laureto; Jeff Kettle

Luminescence down-shifting (LDS) is used in several photovoltaic technologies aiming to improve the photon conversion efficiency (PCE) of the devices through the increase of the light harvesting in the regions of the electromagnetic spectrum where the EQE of the solar cells is poor. The aim of this work was to produce films of mixtures (blends) of two luminescent materials, dispersed in a poly-methyl methacrylate (PMMA) matrix, hoping to improve their properties both as LDS layer and as UV filter when applied on the clear, external surface of P3HT:PC61BM photovoltaic devices. The best results led to an increment of 7.4% in the PCE of the devices, and a six fold enhancement in their half-life (T 50%). This study indicates that multidye LDS layers with optimized optical properties can lead to an effective improvement in the performance and operational stability of OPVs.

Synthetic Metals | 2012

Optical and electrical characteristics of poly(3-alkylthiophene) and polydiphenylamine copolymers: Applications in light-emitting devices

Danielly Cristina Bento; Elaine Cristina Rodrigues Maia; Tiago Nogueira Marques Cervantes; Ricardo Vignoto Fernandes; E. Di Mauro; Edson Laureto; José Leonil Duarte; Ivan Frederico Lupiano Dias; H. de Santana

Journal of Materials Science: Materials in Electronics | 2014

The influence of different electrolytes on the electrical and optical properties of polymer films electrochemically synthesized from 3-alkylthiophenes

Thiago Nogueira Marques Cervantes; Danielly Cristina Bento; Elaine Cristina Rodrigues Maia; Ricardo Vignoto Fernandes; Edson Laureto; Gregory J. Moore; Guy Louarn; Henrique de Santana

Journal of Materials Science: Materials in Electronics | 2014

Photoluminescence and Raman spectroscopy studies of the photodegradation of poly(3-octylthiophene)

Danielly Cristina Bento; Elaine Cristina Rodrigues Maia; Ricardo Vignoto Fernandes; Edson Laureto; Guy Louarn; Henrique de Santana

Current Applied Physics | 2012

Thickness effects on the optical properties of layer-by-layer poly(p-phenylene vinylene) thin films and their use in energy-modulated structures

Edson Laureto; Ricardo Vignoto Fernandes; José Leonil Duarte; Ivan Frederico Lupiano Dias; Alexandre Marletta

Organic Electronics | 2017

Application of luminescence downshifting materials for enhanced stability of CH3NH3PbI3(1-x)Cl3x perovskite photovoltaic devices

Helder Scapin Anizelli; Vasil Stoichkov; Ricardo Vignoto Fernandes; José Leonil Duarte; Edson Laureto; Jeff Kettle; Iris Visoly-Fisher; Eugene A. Katz

Journal of Luminescence | 2018

Tuning the optical properties of luminescent down shifting layers based on organic dyes to increase the efficiency and lifetime of P3HT: PCBM photovoltaic devices

Ricardo Vignoto Fernandes; Alexandre Urbano; José Leonil Duarte; Noel Bristow; Jeff Kettle; Edson Laureto

Journal of Luminescence | 2018

Effect of pressure on the remixing process in CH3NH3Pb(I1-xBrx)3 perovskite thin films

Helder Scapin Anizelli; Ricardo Vignoto Fernandes; Jair Scarminio; Paulo Rogério Catarini da Silva; José Leonil Duarte; Edson Laureto

Applied Physics A | 2018

Photoinduced dedoping in electrochemically synthesized P3HT films

Ricardo Vignoto Fernandes; Flavio Franchello; Danielly Cristina Bento; Wesley Renzi; José Leonil Duarte; Henrique de Santana; Edson Laureto

Synthetic Metals | 2013

Correlation between emission and structural properties of poly(p-phenylene vinylene) thin films

Ricardo Vignoto Fernandes; Ivan Frederico Lupiano Dias; José Leonil Duarte; H. de Santana; Edson Laureto

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Edson Laureto

Universidade Estadual de Londrina

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José Leonil Duarte

Universidade Estadual de Londrina

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Danielly Cristina Bento

Universidade Estadual de Londrina

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Henrique de Santana

Universidade Estadual de Londrina

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Ivan Frederico Lupiano Dias

Universidade Estadual de Londrina

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Elaine Cristina Rodrigues Maia

Universidade Estadual de Londrina

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Helder Scapin Anizelli

Universidade Estadual de Londrina

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Jeff Kettle

Bangor University

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Alexandre Marletta

Federal University of Uberlandia

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H. de Santana

Universidade Estadual de Londrina

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