Impact of processing on the chemical and electronic properties of phenyl-C<sub>61</sub>-butyric acid methyl ester

Maibach, Julia; Adermann, Torben; Glaser, Tobias; Eckstein, Ralph; Mankel, Eric; Pucci, Annemarie; Müllen, Kläus; Lemmer, Uli; Hamburger, Manuel; Mayer, Thomas; Jaegermann, Wolfram

doi:10.1039/c4tc00769g

Cited by 16 publications

(14 citation statements)

References 26 publications

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“…Moreover, there are two significant reasons to use fullerene: even though previous reports claim results with evaporated PC 60 BM, recent studies, by a strongly interdisciplinary approach, using several characterization techniques, have shown [33] that during the thermal evaporation, several different fullerene species, due to thermal decomposition, can be observed (see Fig. 2).…”

Section: Resultsmentioning

confidence: 91%

Reducing Recombination Processes in the Inverted-Solution-Processed Small-Molecule Solar Cells by the Inserted Fullerene Cathode

Коваленко

Zhivkov

Heinrichová

et al. 2016

IEEE J. Photovoltaics

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Inverted architecture organic solar cells are potentially attractive, due to their long-term stability. However, this type of architecture is poorly applied in small-molecule solar cells, due to lower power conversion efficiencies (PCEs), usually caused by low fill factors. Here, the initially low fill factor of the inverted architecture small-molecule solar cells based on a DPP(TBFu) 2 :PC 60 BM blend is augmented by the inserted fullerene layer at the cathode, thus resulting in the efficient charge extraction and, up to now, highest PCE for DPP(TBFu) 2 material and one of the highest for small-molecule DPP derivatives. Highly reproducible devices with PCE up to 5.29% were fabricated, which is notably higher than previously reported results.

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Section: Resultsmentioning

confidence: 91%

Reducing Recombination Processes in the Inverted-Solution-Processed Small-Molecule Solar Cells by the Inserted Fullerene Cathode

Коваленко

Zhivkov

Heinrichová

et al. 2016

IEEE J. Photovoltaics

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“…To substantiate that claim, the blend film Cy7T05 was probed with the element-sensitive scanning probe technique nanoIR TM (Figure 5). A PC 70 BM map was obtained by measuring IR absorption at 1736 cm −1 , characteristic for the carbonyl absorption (C = O) of PC 70 BM (Figure 5(b)) [66]. NanoIR spectra at different locations of the sample are shown in Figure S5.…”

Section: Resultsmentioning

confidence: 99%

Insights into photovoltaic properties of ternary organic solar cells from phase diagrams

Makha

Schwaller

Strassel

et al. 2018

Science and Technology of Advanced Materials

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The efficiency of ternary organic solar cells relies on the spontaneous establishment of a nanostructured network of donor and acceptor phases during film formation. A fundamental understanding of phase composition and arrangement and correlations to photovoltaic device parameters is of utmost relevance for both science and technology. We demonstrate a general approach to understanding solar cell behavior from simple thermodynamic principles. For two ternary blend systems we construct and model phase diagrams. Details of EQE and solar cell parameters can be understood from the phase behavior. Our blend system is composed of PC70BM, PBDTTT-C and a near-infrared absorbing cyanine dye. Cyanine dyes are accompanied by counterions, which, in a first approximation, do not change the photophysical properties of the dye, but strongly influence the morphology of the ternary blend. We argue that counterion dissociation is responsible for different mixing behavior. For the dye with a hexafluorophosphate counterion a hierarchical morphology develops, the dye phase separates on a large scale from PC70BM and cannot contribute to photocurrent. Differently, a cyanine dye with a TRISPHAT counterion shows partial miscibility with PC70BM. A large two-phase region dictated by the PC70BM: PBDTTT-C mixture is present and the dye greatly contributes to the short-circuit current.

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“…The first DSC peak was absent and the temperatures of the second and third peaks shifted. In contrast, Ngo et al 38 and Maibach et al 39 reported this peak with large areas in most recent years when high quality solvent-free samples became available. In particular, the sample used in Ref.…”

Section: B Structural Phase Transitions Of Monoclinic (P2 1 / N)pc 6mentioning

confidence: 89%

“…We noticed that the reported first-heating DSC curves differed drastically from each other, while the second-heating curves were rather consistent in the literature. 20,34,[36][37][38][39] Especially, the first peak at 251 • C was very weak or not observed in some works 36,37 but was striking in some other works. 38,39 The authors of Ref.…”

Section: B Structural Phase Transitions Of Monoclinic (P2 1 / N)pc 6mentioning

confidence: 99%

Hydrogen bonds in PC61BM solids

Chen

et al. 2015

AIP Advances

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We have studied the hydrogen bonds in PC61BM solids. Inter-molecular interaction is analyzed theoretically for the well-defined monoclinic (P21/n) structure. The results indicate that PC61BM combines into C–H⋯Od bonded molecular chains, where Od denotes the doubly-bonded O atom of PC61BM. The molecular chains are linked together by C–H⋯Os bonds, where Os denotes the singly-bonded O atom of PC61BM. To reveal the consequences of hydrogen bond formation on the structural properties of PC61BM solids (not limited to the monoclinic structure), we design and perform some experiments for annealed samples with the monoclinic (P21/n) PC61BM as starting material. The experiments include differential scanning calorimetry, X-ray diffraction and infrared absorption measurements. Structural phase transitions are observed below the melting point. The C–H⋯Od bonds seem persisting in the altered structures. The inter-molecular hydrogen bonds can help to understand the phase separation in polymer/PC61BM blends and may be responsible for the existence of liquid PC61BM.

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Impact of processing on the chemical and electronic properties of phenyl-C₆₁-butyric acid methyl ester

Cited by 16 publications

References 26 publications

Reducing Recombination Processes in the Inverted-Solution-Processed Small-Molecule Solar Cells by the Inserted Fullerene Cathode

Reducing Recombination Processes in the Inverted-Solution-Processed Small-Molecule Solar Cells by the Inserted Fullerene Cathode

Insights into photovoltaic properties of ternary organic solar cells from phase diagrams

Hydrogen bonds in PC61BM solids

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Impact of processing on the chemical and electronic properties of phenyl-C61-butyric acid methyl ester

Cited by 16 publications

References 26 publications

Reducing Recombination Processes in the Inverted-Solution-Processed Small-Molecule Solar Cells by the Inserted Fullerene Cathode

Reducing Recombination Processes in the Inverted-Solution-Processed Small-Molecule Solar Cells by the Inserted Fullerene Cathode

Insights into photovoltaic properties of ternary organic solar cells from phase diagrams

Hydrogen bonds in PC61BM solids

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Product

Resources

About

Impact of processing on the chemical and electronic properties of phenyl-C₆₁-butyric acid methyl ester