Publication

Polypyridyl Ru(II)-sensitizers with extended pi-system enhances the performance of dye sensitized solar cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Jun Ho Yum
2011
Journal Articles

Abstract

New polypyridyl ruthenium(II) complexes "cis-Ru(4,4'-dimesity1-2,2'-bipyridine) (Ln) (NCS)(2) H102" and "cis-Ru(4,4'-bis(2,3,6-tri-isopropylphenyl)-2,2'-bipyridine) (Ln) (NCS)(2) H105", where Ln = 4,4'-dicarboxylic acid-2,2'-bipyridine; were synthesized and successfully applied to sensitization of nano-crystalline TiO2 based solar cells (DSSCs). The DSSCs of H102 and H105 fabricated from 0.16 cm(2) TiO2 electrodes exhibited broader comparable photocurrent action spectra with almost identical solar-to-electrical energy conversion efficiency (II) as compared to N719 sensitizer. The incident photon-to-current conversion efficiency (IPCE) values of 98% and 95% were obtained for H102 and H105 sensitizers respectively. Under 1 sun condition, eta-values of 8.39% (short-circuit photocurrent (J(SC))= 16.4 mA/cm(2), open-circuit photo voltage (V-OC) = 692 mV, fill factor = 0.734), 8.76% (J(SC) = 16.3 mA/cm(2), V-OC = 735 mV, fill factor = 0.734) and 9.12% (J(SC) = 16.1 mA/cm(2), V-OC = 745 mV, fill factor = 0.753) were obtained for H102, H105 and N719 sensitizers respectively. (C) 2011 Elsevier B.V. All rights reserved.

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https://infoscience.epfl.ch/entities/publication/84e9c261-4c76-48fe-9a54-5148b5826ef4

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Michael Graetzel, Mohammad Khaja Nazeeruddin, Jun Ho Yum
2011
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/84e9c261-4c76-48fe-9a54-5148b5826ef4

About this result

Ontological neighbourhood

Energy engineering

Solar power: Topics in solar power

Related concepts (17)

Solar cell

A solar cell, or photovoltaic cell, is an electronic device that converts the energy of light directly into electricity by the photovoltaic effect, which is a physical phenomenon. It is a form of photoelectric cell, defined as a device whose electrical characteristics, such as current, voltage, or resistance, vary when exposed to light. Individual solar cell devices are often the electrical building blocks of photovoltaic modules, known colloquially as solar panels.

Nanocrystal solar cell

Nanocrystal solar cells are solar cells based on a substrate with a coating of nanocrystals. The nanocrystals are typically based on silicon, CdTe or CIGS and the substrates are generally silicon or various organic conductors. Quantum dot solar cells are a variant of this approach which take advantage of quantum mechanical effects to extract further performance. Dye-sensitized solar cells are another related approach, but in this case the nano-structuring is a part of the substrate.

Hybrid solar cell

Hybrid solar cells combine advantages of both organic and inorganic semiconductors. Hybrid photovoltaics have organic materials that consist of conjugated polymers that absorb light as the donor and transport holes. Inorganic materials in hybrid cells are used as the acceptor and electron transporter in the structure. The hybrid photovoltaic devices have a potential for not only low-cost by roll-to-roll processing but also for scalable solar power conversion. Solar cells are devices that convert sunlight into electricity by the photovoltaic effect.

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