Copolymers of Cyclopentadithiophene and Electron‐Deficient Aromatic Units Designed for Photovoltaic Applications

Bijleveld, Johan; Shahid, Munazza; Gilot, J Jan; Wienk, Martijn M.; Janssen, Raj René

doi:10.1002/adfm.200900412

Cited by 149 publications

(121 citation statements)

References 37 publications

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“…Because polythiophenes and thiophene-containing copolymers best fulfill all of these requirements, they are arguably the most successful classes of conjugated polymers thus far, and they have been the focus of the majority of research in this field. [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] Thiophene polymers do face certain limitations however. Specifically, their optical band-gap (1.9 eV) is relatively large when compared to inorganic thin-film semiconductors such as CdTe (1.5 eV).…”

Section: Introductionmentioning

confidence: 97%

Polytellurophenes

Jahnke¹,

Seferos²

2011

Macromol. Rapid Commun.

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Will polytellurophenes bridge the gap between conjugated polymer and inorganic solid-state semiconductors? Polytellurophenes are a virtually unexplored class of conjugated polymer. In this paper, the synthetic methodologies that have been used to prepare polytellurophenes are chronicled. The properties of the resulting polymers are discussed and their potential for use as electronic materials is evaluated. It is far too early to know if these materials will lead to a useful class of thin-film semiconductors, however some key challenges associated with their synthesis and implementation are outlined. These challenges will need to be addressed as the conjugated polymer research community begins to utilize this area of the periodic table.

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Section: Introductionmentioning

confidence: 97%

Polytellurophenes

Jahnke¹,

Seferos²

2011

Macromol. Rapid Commun.

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“…Much research has been devoted in the last years to synthesize new polymer materials with a low bandgap. [ 11 ] In recent research, poly [2,6- …”

Section: Doi: 101002/aenm201000027mentioning

confidence: 99%

Combinatorial Screening of Polymer:Fullerene Blends for Organic Solar Cells by Inkjet Printing

Teichler

Eckardt

Hoeppener

et al. 2010

Advanced Energy Materials

103

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Polymer:fullerene blends were screened in a combinatorial approach using inkjet printing thin film libraries for photovoltaic devices. The application of inkjet printing enabled a fast and simple experimental workflow from film preparation to the study of structure‐property‐relationships with a very high material efficiency. Inkjet printing requires less material for the preparation of thin film libraries in comparison to other dispensing techniques, like spin‐coating. Two polymers (PCPDTBT, PSBTBT) and two fullerene derivatives (mono‐PCBM, bis‐PCBM) were investigated in various blend ratios, concentrations, solvent ratios, and film thicknesses. Morphological and optical properties of the inkjet printed films were investigated and compared with spin‐coated films. This study shows the principle of an experimental setup from solution preparation to film characterization for the combinatorial investigation of large polymer:fullerene libraries.

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“…Therefore, their separation might require less pronounced offsets in heterojunctions and thus a decreased energy and voltage loss for complete charge separation in solar cells 24,25 .…”

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confidence: 99%

Structural correlations in the generation of polaron pairs in low-bandgap polymers for photovoltaics

et al. 2012

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Polymeric semiconductors are materials where unique optical and electronic properties often originate from a tailored chemical structure. This allows for synthesizing conjugated macromolecules with ad hoc functionalities for organic electronics. In photovoltaics, donoracceptor co-polymers, with moieties of different electron affinity alternating on the chain, have attracted considerable interest. The low bandgap offers optimal light-harvesting characteristics and has inspired work towards record power conversion efficiencies. Here we show for the first time how the chemical structure of donor and acceptor moieties controls the photogeneration of polaron pairs. We show that co-polymers with strong acceptors show large yields of polaron pair formation up to 24% of the initial photoexcitations as compared with a homopolymer (η = 8%). π-conjugated spacers, separating the donor and acceptor centre of masses, have the beneficial role of increasing the recombination time. The results provide useful input into the understanding of polaron pair photogeneration in low-bandgap co-polymers for photovoltaics.

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Copolymers of Cyclopentadithiophene and Electron‐Deficient Aromatic Units Designed for Photovoltaic Applications

Cited by 149 publications

References 37 publications

Polytellurophenes

Polytellurophenes

Combinatorial Screening of Polymer:Fullerene Blends for Organic Solar Cells by Inkjet Printing

Structural correlations in the generation of polaron pairs in low-bandgap polymers for photovoltaics

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