Green solvents for organic thin-film transistor processing

Ho, Dongil; Lee, Jeongyeon; Park, Sangyun; Park, Yonghan; Cho, Kwanghee; Campana, Filippo; Lanari, Daniela; Facchetti, Antonio; Seo, Sang‐Hun; Kim, Choongik; Marrocchi, Assunta; Vaccaro, Luigi

doi:10.1039/d0tc00512f

Cited by 46 publications

(36 citation statements)

References 71 publications

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“…Thus, we can envision that the continuous development of high-performance semiconductors compatible with environmentally benign solvents, together with the present patterning methodology, will facilitate the industrialization of solution-processed organic electronics. 53 , 54 …”

Section: Discussionmentioning

confidence: 99%

Foundry-compatible high-resolution patterning of vertically phase-separated semiconducting films for ultraflexible organic electronics

et al. 2021

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Solution processability of polymer semiconductors becomes an unfavorable factor during the fabrication of pixelated films since the underlying layer is vulnerable to subsequent solvent exposure. A foundry-compatible patterning process must meet requirements including high-throughput and high-resolution patternability, broad generality, ambient processability, environmentally benign solvents, and, minimal device performance degradation. However, known methodologies can only meet very few of these requirements. Here, a facile photolithographic approach is demonstrated for foundry-compatible high-resolution patterning of known p- and n-type semiconducting polymers. This process involves crosslinking a vertically phase-separated blend of the semiconducting polymer and a UV photocurable additive, and enables ambient processable photopatterning at resolutions as high as 0.5 μm in only three steps with environmentally benign solvents. The patterned semiconducting films can be integrated into thin-film transistors having excellent transport characteristics, low off-currents, and high thermal (up to 175 °C) and chemical (24 h immersion in chloroform) stability. Moreover, these patterned organic structures can also be integrated on 1.5 μm-thick parylene substrates to yield highly flexible (1 mm radius) and mechanically robust (5,000 bending cycles) thin-film transistors.

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Section: Discussionmentioning

confidence: 99%

Foundry-compatible high-resolution patterning of vertically phase-separated semiconducting films for ultraflexible organic electronics

et al. 2021

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“…Anisole is a real green solvent and can even be used as a food additive. [14,22,62] In addition, it has relatively high boiling point. All these features make it a great solvent candidate for large area fabrication of organic electronic devices via solution casting methods.…”

Section: Resultsmentioning

confidence: 99%

Toward High Mobility Green Solvent‐Processable Conjugated Polymers: A Systematic Study on Chalcogen Effect in Poly(Diketopyrrolopyrrole‐alt‐Terchalcogenophene)s

Wang

Shi

Deng

et al. 2021

Adv Funct Materials

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Nine diketopyrrolopyrrole (DPP)-based conjugated polymers (CPs), that is, poly(diketopyrrolopyrrole-alt-terchalcogenophene)s, via combinations of furanyl-(FDPP), thienyl-(TDPP), selenophenyl-DPP (SeDPP) and furan, thiophene, selenophene comonomers, are synthesized to explore the chalcogen effect on the solubility, film morphology/microstructure, and charge transport property of the resultant polymers. All polymers except for SeDPP-Se are soluble in non-chlorinated solvents such as o-xylene and tetralin. Flanking of DPP with furan in FDPP-F, FDPP-T, and FDPP-Se enables even good solubility in green solvent anisole. TDPP-Se exhibits the highest reliable hole mobility over 10 cm 2 V −1 s −1 in organic thin film transistors (OTFTs) bar-coated from o-xylene/tetralin (20/80 v/v) solution. With anisole as the processing solvent, FDPP-F-based bar-coated OTFTs displays a reliable hole mobility up to 3.50 cm 2 V −1 s −1 . This is the first report on green solvent processed OTFTs with mobility above 1 cm 2 V −1 s −1 . Charge transport property of all the polymers is correlated with the film morphology and microstructure that are noticeably influenced by the type and position of chalcogenophenes. The current work sheds light on the design of high mobility CPs processable with green solvents.

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“…solvent greenness, boiling point requirement for safety/processing, viscosity for the crystallization/purification steps). According to a classification reported in a recent paper of Vaccaro et al, 47 on the use of green solvents for organic thin-film transistor processing, the solvent color code is inspired by the GlaxoSmithKline, GSK, and CHEM 21 solvent selection guides for the pharmaceutical industry. [48][49][50][51] These guides account for the physical and (eco)toxicity properties of solvents by transforming them into a scale to determine their greenness.…”

Section: Resultsmentioning

confidence: 99%

Extensive Screening of Green Solvents for Safe and Sustainable UiO-66 Synthesis

Venturi¹,

Campana²,

Marmottini³

et al. 2020

Preprint

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<p>Zirconium based Metal-Organic Framework UiO-66 is to date considered one of the benchmark compound among stable MOFs and it has attracted a huge attention for its employment in many strategic applications. Large scale production of UiO-66 for industrial purposes requires the use of safe and green solvents, fulfilling the green chemistry principles and able to replace the use of <i>N,N</i>-Dimethyl-Formamide (DMF), which, despite its toxicity, is still considered the most efficient solvent for obtaining UiO-66 of high quality. Herein we report on a survey of about 40 different solvents with different polarity, boiling point and acidity, used for the laboratory scale synthesis of high quality UiO-66 crystals. The solvents were chosen according the European REACH Regulation 1907/2006 among those having low cost, low toxicity and fully biodegradable. Concerning MOF synthesis, the relevant parameters chosen for establishing the quality of the results obtained are the degree are the crystallinity, microporosity and specific surface area, yield and solvent recyclability. Taking into account also the chemical physical properties of all the solvents, a color code was assigned in order to give a final green assessment for the UiO-66 synthesis. Defectivity of the obtained products, the use of acidic modulators and the use of alternative Zr-salts have been also taken into consideration. Preliminary results lead to conclude that GVL (γ-valerolactone) is among the most promising solvents for replacing DMF in UiO-66 MOF synthesis. </p>

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Green solvents for organic thin-film transistor processing

Abstract: A wide range of green solvents are explored to process TIPS-PEN (6,13-bis(triisopropylsilylethynyl)pentacene), and several other p- and n-type organic semiconductors for their potential generality in fabricating organic thin-film transistors.

Cited by 46 publications

References 71 publications

Foundry-compatible high-resolution patterning of vertically phase-separated semiconducting films for ultraflexible organic electronics

Foundry-compatible high-resolution patterning of vertically phase-separated semiconducting films for ultraflexible organic electronics

Toward High Mobility Green Solvent‐Processable Conjugated Polymers: A Systematic Study on Chalcogen Effect in Poly(Diketopyrrolopyrrole‐alt‐Terchalcogenophene)s

Extensive Screening of Green Solvents for Safe and Sustainable UiO-66 Synthesis

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