Time‐Dependent Morphology Evolution by Annealing Processes on Polymer:Fullerene Blend Solar Cells

Jo, Jang; Kim, Seok‐Soon; Na, Seok‐In; Yu, Byung-Kwan; Kim, Dong‐Yu

doi:10.1002/adfm.200800968

Cited by 286 publications

(229 citation statements)

References 30 publications

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“…Combining all these strategy into a systematic program for tuning ordered aggregation of conjugated polymers for charge transport in solution will be helpful for the straight processing of solution to prepare efficient film devices. The strategy of solvent vapor annealing is mild [171] and flexible due to the treatment at room temperature and various solvent vapor atmospheres. As a method involving (partly) dissolution of chains, SVA is also a potential tool simulating solution processing to better understand the self-assembly of conjugated polymers during film formation.…”

Section: Promotion Of Coil-to-rod Transition and Ordered Rod-rod Stacmentioning

confidence: 99%

Structure and Morphology Control in Thin Films of Conjugated Polymers for an Improved Charge Transport

Wang

et al. 2013

Polymers

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Abstract:The morphological and structural features of the conjugated polymer films play an important role in the charge transport and the final performance of organic optoelectronics devices [such as organic thin-film transistor (OTFT) and organic photovoltaic cell (OPV), etc.] in terms of crystallinity, packing of polymer chains and connection between crystal domains. This review will discuss how the conjugated polymer solidify into, for instance, thin-film structures, and how to control the molecular arrangement of such functional polymer architectures by controlling the polymer chain rigidity, polymer solution aggregation, suitable processing procedures, etc. These basic elements in intrinsic properties and processing strategy described here would be helpful to understand the correlation between morphology and charge transport properties and guide the preparation of efficient functional conjugated polymer films correspondingly.

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Section: Promotion Of Coil-to-rod Transition and Ordered Rod-rod Stacmentioning

confidence: 99%

Structure and Morphology Control in Thin Films of Conjugated Polymers for an Improved Charge Transport

Wang

et al. 2013

Polymers

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“…Beside the donor/acceptor ratio, the most important parameters that infl uence the nanoscale morphology are the processing solvent, the solute concentration, and the method of fi lm preparation. [30][31][32] Inkjet printing of thin-fi lm libraries allows a reproducible method for comparing different concentrations, ratios, and fi lm thicknesses. [ 26 ] Newly discovered donor/acceptor materials require a large number of combinations to be tested for their behavior in bulk heterojunction solar cell applications.…”

Section: Introductionmentioning

confidence: 99%

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

Teichler

Eckardt

Hoeppener

et al. 2010

Advanced Energy Materials

102

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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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“…This may be attributed to a reduced effective band gap caused by improved crystallinity. 48,49 The V OC gradually increased from 0.61 to 0.78 V with increasing number of fluorine atoms in the polymer backbone. The BTzDT2FBT:PC 71 BM device exhibited the highest PCE of 7% among the three copolymers with J SC of 14.64 mA cm − 2 , V OC of 0.75 V and FF of 0.64.…”

Section: Photovoltaic Characteristicsmentioning

confidence: 99%

Semi-crystalline A1–D–A2-type copolymers for efficient polymer solar cells

Nguyen

Choi

et al. 2016

Polym J

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A series of acceptor 1 -donor-acceptor 2 (A 1 -D-A 2 )-type copolymers was designed and synthesized using thiophene as an electronrich unit and benzothiadiazole (BT) and benzotriazole (BTz) as electron-deficient moieties. A weaker acceptor, BTz, was incorporated as a solubilizing moiety with three tetradecyl (or tetradecyloxy) side chains, and a stronger acceptor, BT, was substituted with different numbers of fluorines to modulate the intramolecular charge transfer interaction and the resulting electronic structures. The similar molecular structures of BT and BTz did not disrupt the interchain organization significantly, and the absence of solubilizing alkyl substituents on the electron-rich thiophene did not increase the highest occupied molecular orbital of the resulting polymers. The polymers showed broad absorption in the range of 350-750 nm. Intra-and/or interchain non-covalent coulombic interactions (for example, dipole-dipole interactions via S···O, S···F) ensured a planar backbone and a semi-crystalline morphology in the film. Bulk heterojunction polymer solar cells were fabricated using blends of the polymers and phenyl-C 71 -butyric acid methyl ester (PC 71 BM). For a difluoro-BT containing polymer (BTzDT2FBT), a power conversion efficiency up to 7% was achieved with a short circuit current density of 14.64 mA cm − 2 , open circuit voltage of 0.75 V and fill factor of 0.64.

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Time‐Dependent Morphology Evolution by Annealing Processes on Polymer:Fullerene Blend Solar Cells

Cited by 286 publications

References 30 publications

Structure and Morphology Control in Thin Films of Conjugated Polymers for an Improved Charge Transport

Structure and Morphology Control in Thin Films of Conjugated Polymers for an Improved Charge Transport

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

Semi-crystalline A1–D–A2-type copolymers for efficient polymer solar cells

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