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

Wang, Haiyang; Xu, Yaozhuo; Yu, Xinge; Xing, Rubo; Liu, Jiangang; Han, Yanchun

doi:10.3390/polym5041272

Cited by 89 publications

(90 citation statements)

References 178 publications

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“…DPP-TT-T is a push-pull type conjugated polymer, well known for its planarity and rigidity due to two thieno [3,2b]thiophene moieties that increase the conjugation length, promoting chain aggregation. 34,35 DPP-TT-T has been studied extensively, especially in transistors, due to its good ambipolarity and hole mobility above 1 cm 2 V À1 s À1 . 36 Lately, the very same polymer showed a power conversion efficiency of 6.6% in spin coated organic photovoltaic devices via molecular weight tuning.…”

Section: Heterogeneous Dryingmentioning

confidence: 99%

Real-time evaluation of thin film drying kinetics using an advanced, multi-probe optical setup

et al. 2016

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a Solution-processed organic photovoltaic devices are advantageous due to their low-cost large area manufacturing techniques, such as slot-die coating, gravure printing and roll-to-roll coating. The final microstructure of a polymer:fullerene bulk-heterojunction (BHJ) film is a fine interplay between solution thermodynamics (e.g. solubility, miscibility. . .) and kinetics (e.g. solvent evaporation, polymer ordering, phase separation. . .) during the drying process. In order to design better performing organic photovoltaic devices, gaining knowledge over the drying properties of polymer:fullerene thin films is essential.A novel in situ thin film drying characterization chamber, equipped with white-light reflectometry, laser light scattering and photoluminescence, is presented in combination with grazing-incidence X-ray diffraction on two different polymer:fullerene bulk heterojunctions based on poly-(3-hexylthiophene-2,5-diyl) (P3HT) and polythieno [3,2b]thiophene-diketopyrrolopyrrole-co-thiophene (DPP-TT-T) polymers.With photoluminescence applied for the first time as an in situ method for such drying studies, these single-chamber measurements track the fine interplay between thermodynamics and kinetics of thin film drying and provide invaluable information on solution behavior and microstructure formation.

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Section: Heterogeneous Dryingmentioning

confidence: 99%

Real-time evaluation of thin film drying kinetics using an advanced, multi-probe optical setup

et al. 2016

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“…In particular, the balance between aggregation and disorder of conjugated polymers in optoelectronic devices remains to be a vital topic. [4][5] Highly ordered regions are beneficial for a small band gap due to intermolecular coupling and allow efficient charge transport via extended conjugated regions and small hopping distances. However, too large domains limit the dissociation efficiency of excitons in organic solar cells, due to their typically short diffusion length.…”

Section: Introductionmentioning

confidence: 99%

Mixed side-chain geometries for aggregation control of poly(fluorene-alt-bithiophene) and their effects on photophysics and charge transport

et al. 2016

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In organic optoelectronics, order of conjugated molecules is required for good charge transport, but strong aggregation behavior may generate grain boundaries and trapping, opposing those benefits. Side chains on a polymer's backbone are major reason for and also tool to modify its morphological characteristics. In this report, we show on the example poly(9,9-dioctylfluorenylco-bithiophene) (F8T2) that by a combination of two types of side-chains on the backbone of equal number of carbons, one promoting crystallization, another hindering it, organization of the main chains can be controlled, without changing its major properties. We compare the traditional F8T2 derivative with octyl substituent with two modified species, one containing solely 2ethylhexyl side-chains and another with both types randomly distributed. Thermal characteristics, photophysics and morphology are compared and effects on film formation and 2 charge transport in bulk-heterojunction blends demonstrated on photovoltaic devices utilizing F8T2s as donor and the fullerene derivative ICBA as acceptor material.

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“…The performance of OSCs based on D‐A conjugated polymers have also reached 14%, making commercialization very promising in the near future . To achieve high device performance, the aggregated structure of these conjugated polymers should be well controlled …”

Section: Introductionmentioning

confidence: 99%

Conjugated polymer single crystals and nanowires

Cao

Zhao

Liang

et al. 2019

Polymer Crystallization

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Conjugated polymer single crystals and nanowires show advantages for the study of intrinsic charge transport in conjugated polymers and achieve high device performance. However, preparation of conjugated polymer single crystals and nanowires, especially donor‐acceptor (D‐A) conjugated polymers, is challenging. In this review, the structural features of conjugated polymers are first described. Then, the mechanism of conjugated polymer crystallization in terms of thermodynamic equilibrium state, nucleation, and growth is discussed. Single crystals of poly(alkylthiophene)s (P3ATs) and nanowires of both P3ATs and D‐A conjugated polymers are subsequently reviewed. Growth kinetics are a key issue in growing D‐A‐conjugated polymer crystals. Finally, the device performance based on conjugated polymer single crystals and nanowires is summarized.

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

Cited by 89 publications

References 178 publications

Real-time evaluation of thin film drying kinetics using an advanced, multi-probe optical setup

Real-time evaluation of thin film drying kinetics using an advanced, multi-probe optical setup

Mixed side-chain geometries for aggregation control of poly(fluorene-alt-bithiophene) and their effects on photophysics and charge transport

Conjugated polymer single crystals and nanowires

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