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Functional Π-conjugated polymers based on maleimide for photovoltaic applications

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Gironda R., Miozzo L., Tondelier D., Chaigneau M., Ghabboun J., Faroun M., Papagni A., Salamone M. M., Ruffo R., Yassar A.

Organic Photonics and Photovoltaics

2013

vol. 1

56-66

A series of new bis-(2-thienyl) maleimide monomers have been synthesized and characterized. The bis-(2- thienyl)maleimide unit has been copolymerized with different aromatic comonomers. Stille coupling polymerizations under various conditions have been utilized. The copolymers were then characterized by size-exclusion chromatography and their optical and electronic properties were investigated by UV-Vis absorption spectroscopy and cyclic voltammetry. All maleimide based copolymers shared similar LUMO energy levels, which are largely determined by the acceptor moiety, and are close to that of PC61BM to be effective for charge dissociation. These low band gap polymers have been tested for photovoltaic applications and have shown moderate photovoltaic performance. Interesting results were obtained by adding the polymer to the P3HT:PC61BM mixture, as a third component. The ternary blend BHJ solar cells showed power conversion efficiencies of 35% exceeding those of the corresponding binary blends.

Continuous lateral gradients in film morphology for position sensitive detection and organic solar cell optimization

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Campoy-Quiles M., Randon V., Mróz M. M., Jarzaguet M., Garriga M., Cabanillas-González J.

Organic Photonics and Photovoltaics

2013

vol. 1

11-23

We present a method to fabricate binary organic donor and acceptor blends exhibiting a controlled lateral gradient in morphology. Upon combining photometry, ellipsometry and Xray maps together with photoinduced absorption measurements, we show how the gradual exposure to solvent vapor results in a varying degree of polymer crystallinity for the polythiophene/soluble fullerene system along one direction. These morphologically graded samples are characterized by a spectral photoresponse that depends on the specific location in the area of the device where the light beam impinges, a property that stands as proof-of-concept for position sensitive detection. Moreover, we demonstrate that the development of graded morphologies is an effective one-step method which allows for fast performance optimization of organic solar cells. Finally, the appropriateness of eight different solvents for morphology control via vapor annealing is evaluated in a time-effective way using the advanced method, which helps to identify boiling point and solubility as the key processing parameters.

Efficiency enhancement of P3HT:PCBM solar cells containing scattering Zn-Al hydrotalcite nanoparticles in the PEDOT:PSS layer

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Bolognesi M., Tessarolo M., Posati T., Nocchetti M., Benfenati V., Seri M., Ruani G., Muccini M.

Organic Photonics and Photovoltaics

2013

vol. 1

1-10

In this article we report on a new hybrid (organic-inorganic) composite material based on hydrophilic, electrically inert and semi-transparent hydrotalcite (HT) nanoparticles and a pHneutral formulation of PEDOT:PSS. The application of this composite material as electrically and optically active buffer layer in P3HT:PC61BM bulk heterojunction (BHJ) solar cells is reported. Two different synthetic routes are explored to obtain HTs having discoid shape, with a diameter of around 150- 200 nm and a thickness of ~20 nm, to be easily embedded in ~50 nm thick PEDOT:PSS films. The good affinity between HTs and the sulfonate groups of the PEDOT:PSS allows to obtain homogeneous HTs/PEDOT:PSS films, for HT concentrations of 0.25% and 0.50% by weight (vs. PEDOT:PSS). At these particle loads the electrical and morphological features of doped and undoped PEDOT:PSS films are nearly identical, while providing a significant effect on the visible light scattering properties of the composite films. We demonstrate ~12% improvement in power conversion efficiency (PCE) for P3HT:PC61BM solar cells incorporating HTs in the PEDOT: PSS layer, which mainly originates from increased shortcircuit current densities (JSC).

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3 Organic Photonics and Photovoltaics

3 2013

1 Benfenati V.

1 Bolognesi M.

1 Cabanillas-González J.

1 Campoy-Quiles M.

1 Chaigneau M.

1 Faroun M.

1 Garriga M.

1 Ghabboun J.

1 Gironda R.

1 Jarzaguet M.

1 Miozzo L.

1 Mróz M. M.

1 Muccini M.

1 Nocchetti M.

1 Papagni A.

1 Posati T.

1 Randon V.

1 Ruani G.

1 Ruffo R.

1 Salamone M. M.

1 Seri M.

1 Tessarolo M.

1 Tondelier D.

1 Yassar A.

Search results

Functional Π-conjugated polymers based on maleimide for photovoltaic applications

Continuous lateral gradients in film morphology for position sensitive detection and organic solar cell optimization

Efficiency enhancement of P3HT:PCBM solar cells containing scattering Zn-Al hydrotalcite nanoparticles in the PEDOT:PSS layer