Publications by Guido Viscardi

Xanthan-Based Hydrogel for Stable and Efficient Quasi-Solid Truly Aqueous Dye-Sensitized Solar Cell with Cobalt Mediator

Michael Graetzel, Guido Viscardi, Ulf Anders Hagfeldt, Fabrizio Giordano

Aqueous dye-sensitized solar cells (DSSCs) are emerging as a promising alternative to enhance both the lifetime and environmental friendliness of traditional DSSCs. Herein, a cobalt-based, jellified (with xanthan gum) aqueous electrolyte, leading to a valu ...

WILEY-V C H VERLAG GMBH2021

Hydrogel Electrolytes Based on Xanthan Gum: Green Route towards Stable Dye-Sensitized Solar Cells

Guido Viscardi

The investigation of innovative electrolytes based on nontoxic and nonflammable solvents is an up-to-date, intriguing challenge to push forward the environmental sustainability of dye-sensitized solar cells (DSSCs). Water is one of the best choices, thus 1 ...

MDPI2020

Boosting the efficiency of aqueous solar cells: A photoelectrochemical estimation on the effectiveness of TiCl4 treatment

Michael Graetzel, Guido Viscardi

Increasing the photocurrent is one of the main objectives of the current research on aqueous photovoltaic cells, the emerging green, alternative technology in solar energy conversion devices. In such a scenario, this work deals with the thorough understand ...

PERGAMON-ELSEVIER SCIENCE LTD2019

Finely tuning electrolytes and photoanodes in aqueous solar cells by experimental design

Guido Viscardi

2018

Photoanode/Electrolyte Interface Stability in Aqueous Dye-Sensitized Solar Cells

Michael Graetzel, Guido Viscardi

O'Regan and Gratzel conceived a dye-sensitized solar cell (DSSC), which operates as an artificial photosynthetic system converting solar light into electricity. Nevertheless, it is only recently that the scientific community is focusing on truly aqueous DS ...

Wiley-V C H Verlag Gmbh2017

Approaching truly sustainable solar cells by the use of water and cellulose derivatives

Michael Graetzel, Guido Viscardi

Aqueous dye-sensitized solar cells (DSSCs) are emerging as the first truly safe, cheap and eco-friendly photovoltaic technology, at the same time overcoming the well-known instability upon moisture/water contamination typical of many solar cells. While man ...

Royal Soc Chemistry2017

Unveiling iodine-based electrolytes chemistry in aqueous dye-sensitized solar cells

Michael Graetzel, Guido Viscardi

Aqueous dye-sensitized solar cells (DSSCs) have recently emerged as promising systems, which can combine low cost and environmental compatibility with appreciable efficiency, long-term durability and enhanced safety. In the present study, we thoroughly inv ...

2016

Panchromatic symmetrical squaraines: a step forward in the molecular engineering of low cost blue-greenish sensitizers for dye-sensitized solar cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Guido Viscardi, Davide Di Censo, Jun Ho Yum, Elisa Dell'Orto

Two novel symmetrical blue squaraine sensitizers were synthesized, which exhibit panchromatic light harvesting and a record efficiency over 6% with J(sc) exceeding 14 mA cm(-2), and V-oc over 620 mV under 1 sun. Their color, low cost, easiness of synthesis ...

Royal Soc Chemistry2014

A Simple Synthetic Route to Obtain Pure Trans-Ruthenium(II) Complexes for Dye-Sensitized Solar Cell Applications

Michael Graetzel, Mohammad Khaja Nazeeruddin, Guido Viscardi, Davide Di Censo, Jun Ho Yum, Filippo de Angelis

We report a facile synthetic route to obtain functionalized quaterpyridine ligand and its trans-dithiocyanato ruthenium complex, based on a microwave-assisted procedure. The ruthenium complex has been purified using a silica chromatographic column by prote ...

Wiley-VCH Verlag Berlin2013

Enhancing the efficiency of a dye sensitized solar cell due to the energy transfer between CdSe quantum dots and a designed squaraine dye

Michael Graetzel, Mohammad Khaja Nazeeruddin, Guido Viscardi, Lioz Etgar

The power conversion efficiency of a dye-sensitized solar cell with tailored squaraine dye enhanced by 47%, due to Forster resonance energy transfer from CdSe quantum dots to the squaraine dye. The incident photons to collection efficiency of electrons ind ...

2012

Symmetric vs. asymmetric squaraines as photosensitisers in mesoscopic injection solar cells: a structure-property relationship study

Michael Graetzel, Mohammad Khaja Nazeeruddin, Guido Viscardi, Davide Di Censo

A symmetric squaraine and its related non-symmetric structure are shown to have comparable efficiencies in DSCs, but with undoubtedly advantages in the low cost and casiness of synthesis for the symmetrical structure. ...

Royal Society of Chemistry2012

Design and Development of Novel Linker for PbS Quantum Dots/TiO2 Mesoscopic Solar cell

Michael Graetzel, Mohammad Khaja Nazeeruddin, Guido Viscardi, Lioz Etgar

A novel bifunctional linker molecule, bis(4-mercaptophenyl)phosphinic acid, is designed to be used in a QDs solar cells. The linker anchors to TiO2 mesoporous film through the phosphinic acid functional group and to the PbS QDs through the two thiol groups ...

2011

Characterization of monomeric and gemini cationic amphiphilic molecules by fluorescence intensity and anisotropy

Kuppuswamy Kalyanasundaram, Guido Viscardi

Pyrene fluorescence intensity and conductivity measurements were used to determine the cmc of two monomeric surfactants namely, dodecyltrimethylammonium bromide and cetyltrimethylammonium bromide as well as two gemini surfactants, 16-3-16 2Br and 16-4-16 2 ...

2009

A mass spectrometric analysis of sensitizer solution used for dye-sensitized solar cell

Michael Graetzel, Mohammad Khaja Nazeeruddin, Guido Viscardi

2008

Synthesis, Characterization, and DFT-TDDFT Computational Study of a Ruthenium Complex Containing a Functionalized Tetradentate Ligand

Pascal Comte, Michael Graetzel, Paul Liska, Mohammad Khaja Nazeeruddin, Guido Viscardi, Davide Di Censo, Filippo de Angelis

A ruthenium complex trans-[Ru(L)(NCS)2], L ) 4,4¢¢¢-di- tert-butyl-4¢,4¢¢-bis(carboxylic acid)-2,2¢:6¢,2¢¢:6¢¢,2¢¢¢- quaterpyridine (N886), was synthesized and characterized by spectroscopic and electrochemical methods. The absorption spectrum of the N886 ...

2006

Combined Experimental and DFT-TDDFT Computational Study of Photoelectrochemical Cell Ruthenium Sensitizers

Michael Graetzel, Paul Liska, Mohammad Khaja Nazeeruddin, Guido Viscardi, Takeru Bessho, Filippo de Angelis

2005

Stepwise assembly of amphiphilic ruthenium sensitizers and their applications in dye-sensitized solar cell

Pascal Comte, Michael Graetzel, Paul Liska, Mohammad Khaja Nazeeruddin, Shaik Mohammed Zakeeruddin, Guido Viscardi, Kurt Schenk

2004

Design, synthesis, and application of amphiphilic ruthenium polypyridyl photosensitizers in solar cells based on nanocrystalline TiO2 films

Michael Graetzel, Mohammad Khaja Nazeeruddin, Shaik Mohammed Zakeeruddin, Robin Humphry-Baker, Péter Kalman Péchy, Guido Viscardi

2002