Comparison of the electron work function, hole concentration and exciton diffusion length for P3HT and PT prepared by thermal or acid cleavage

Toušek, J.; Toušková, J.; Ludvík, J.; Liška, Alan; Remeš, Z.; Kylián, Ondřej; Kousal, Jaroslav; Chomutová, R.; Heckler, Ilona Maria; Bundgaard, Eva; Krebs, Frederik C.

doi:10.1016/j.sse.2015.11.002

Cited by 18 publications

(6 citation statements)

References 29 publications

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“…Krebs et al compared P3HT with PT obtained by two different methods. 8.4 first eliminates an alkene and then CO 2 at 300 °C whereas the silyl groups of 10.5 could be cleaved at room temperature by acid treatment (Figure ).…”

Section: Thermal Cleavagementioning

confidence: 99%

Immobilization Strategies for Organic Semiconducting Conjugated Polymers

et al. 2018

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This Review details synthetic routes toward and properties of insoluble polymeric organic semiconductors obtained through desolubilization strategies. Typical applications include fixation of donor-acceptor bulk-heterojunction morphologies in organic photovoltaic cells, cross-linking of charge transport materials and active emitters in light emitting diodes or similar devices, and immobilization of morphologies in field effect transistors. A second important application is the structuring of organic semiconductors, using them as photoresists. After desolubilization, removal of the nonirradiated resist leads to elevated, micron-sized features of the semiconductor. In this Review, different strategies for desolubilization are covered. By photochemical or thermal cleavage of solubility-mediating groups such as esters, sulfonium salts, amides, ethers, and acetals or by retro-Diels-Alder reactions, volatile elimination products and the insoluble semiconductor are formed. In another case, desolubilization is achieved by cross-linking via functional groups present in the polymer side chains including vinyl, halide, silicone, boronic acid, and azide functionalities, which polymerize thermally or photochemically. Alternatively, small molecular additives such as photoacids, oligothiols, or oligoazides result in network formation in combination with compatible functional groups present in the immobilizable polymers. Advantages and disadvantages of the respective methods are discussed.

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Section: Thermal Cleavagementioning

confidence: 99%

Immobilization Strategies for Organic Semiconducting Conjugated Polymers

et al. 2018

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“…On the contrary the WF of 10% CuSCN@P3HT is located at −5 eV. In dry conditions the system behaves completely different, with P3HT having a WF of about −4.8 eV, and thus confirming the undoped nature of the pristine semiconducting polymer 18 . Five percent CuSCN@P3HT shows large data dispersion, a result that is in accordance with EPR results in dark (Fig.…”

Section: Resultsmentioning

confidence: 86%

“…On the other hand, this choice also forces to identify a dispersion phase in which incorporate CuSCN-NP for solution processing, that can work at the same time as an hole transporter, in order to facilitate the overall charge extraction process from the perovskite layer. A polymeric hole-transporter such as poly(3hexylthiophene) (P3HT), a well-established, inexpensive, organic p-type polymer characterized by an outstanding film forming ability and a good matching with the copper(I)-based inorganic semiconductor valence band 18 , appears to be the most suitable choice, although undoped P3HT is not generally applied as HTM when high PCEs are targeted [19][20][21] . By dispersing CuSCN-NP in P3HT, a nanocomposite HTM is produced, that can be defined as CuSCN@P3HT.…”

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confidence: 99%

Moisture resistance in perovskite solar cells attributed to a water-splitting layer

et al. 2021

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Commercialization of lead halide perovskite-based devices is hindered by their instability towards environmental conditions. In particular, water promotes fast decomposition, leading to a drastic decrease in device performance. Integrating water-splitting active species within ancillary layers to the perovskite absorber might be a solution to this, as they could convert incoming water into oxygen and hydrogen, preserving device performance. Here, we suggest that a CuSCN nanoplatelete/p-type semiconducting polymer composite, combining hole extraction and transport properties with water oxidation activity, transforms incoming water molecules and triggers the in situ p-doping of the conjugated polymer, improving transport of photocharges. Insertion of the nanocomposite into a lead perovskite solar cell with a direct photovoltaic architecture causes stable device performance for 28 days in high-moisture conditions. Our findings demonstrate that the engineering of a hole extraction layer with possible water-splitting additives could be a viable strategy to reduce the impact of moisture in perovskite devices.

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“…Hole addition to polythiophenes in films and solutions shifts the equilibrium between solvated and aggregated states in favor of the aggregates [ 52 ]. Hole injection into the polymers can be realized [ 54 ] by not only (opto)chemical but also electrochemical [ 55 , 56 ] and interfacial [ 50 , 55 ] doping, with the latter two observed for polythiophene films positively polarized by small potential differences [ 50 , 55 , 56 ]. Additionally, polythiophenes in solutions can be rapidly and reversibly oxidized (within seconds) by a varied electric potential [ 57 ].…”

Section: Resultsmentioning

confidence: 99%

Electrically Switchable Film Structure of Conjugated Polymer Composites

et al. 2022

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Domains rich in different blend components phase-separate during deposition, creating a film morphology that determines the performance of active layers in organic electronics. However, morphological control either relies on additional fabrication steps or is limited to a small region where an external interaction is applied. Here, we show that different semiconductor-insulator polymer composites can be rapidly dip-coated with the film structure electrically switched between distinct morphologies during deposition guided by the meniscus formed between the stationary barrier and horizontally drawn solid substrate. Reversible and repeatable changes between the morphologies used in devices, e.g., lateral morphologies and stratified layers of semiconductors and insulators, or between phase-inverted droplet-like structures are manifested only for one polarity of the voltage applied across the meniscus as a rectangular pulse. This phenomenon points to a novel mechanism, related to voltage-induced doping and the doping-dependent solubility of the conjugated polymer, equivalent to an increased semiconductor content that controls the composite morphologies. This is effective only for the positively polarized substrate rather than the barrier, as the former entrains the nearby lower part of the coating solution that forms the final composite film. The mechanism, applied to the pristine semiconductor solution, results in an increased semiconductor deposition and 40-times higher film conductance.

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Comparison of the electron work function, hole concentration and exciton diffusion length for P3HT and PT prepared by thermal or acid cleavage

Cited by 18 publications

References 29 publications

Immobilization Strategies for Organic Semiconducting Conjugated Polymers

Immobilization Strategies for Organic Semiconducting Conjugated Polymers

Moisture resistance in perovskite solar cells attributed to a water-splitting layer

Electrically Switchable Film Structure of Conjugated Polymer Composites

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