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Solution-Processed Donor-Acceptor Polymer Nanowire Network Semiconductors For High-Performance Field-Effect Transistors.

Lei Y, Deng P, Li J, Lin M, Zhu F, Ng TW, Lee CS, Ong BS - Sci Rep (2016)

Bottom Line: Organic field-effect transistors (OFETs) represent a low-cost transistor technology for creating next-generation large-area, flexible and ultra-low-cost electronics.Conversely, the readily soluble, low-MW D-A polymers give low mobility.With the help of cooperative shifting motion of polystyrene chain segments, (I) readily self-assembled and crystallized out in the polystyrene matrix as an interpenetrating, nanowire semiconductor network, providing significantly enhanced mobility (over 8 cm(2)V(-1)s(-1)), on/off ratio (10(7)), and other desirable field-effect properties that meet impactful OFET application requirements.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics and Institute of Advanced Materials, Hong Kong Baptist University, Hong Kong SAR, P. R. China.

ABSTRACT
Organic field-effect transistors (OFETs) represent a low-cost transistor technology for creating next-generation large-area, flexible and ultra-low-cost electronics. Conjugated electron donor-acceptor (D-A) polymers have surfaced as ideal channel semiconductor candidates for OFETs. However, high-molecular weight (MW) D-A polymer semiconductors, which offer high field-effect mobility, generally suffer from processing complications due to limited solubility. Conversely, the readily soluble, low-MW D-A polymers give low mobility. We report herein a facile solution process which transformed a lower-MW, low-mobility diketopyrrolopyrrole-dithienylthieno[3,2-b]thiophene (I) into a high crystalline order and high-mobility semiconductor for OFETs applications. The process involved solution fabrication of a channel semiconductor film from a lower-MW (I) and polystyrene blends. With the help of cooperative shifting motion of polystyrene chain segments, (I) readily self-assembled and crystallized out in the polystyrene matrix as an interpenetrating, nanowire semiconductor network, providing significantly enhanced mobility (over 8 cm(2)V(-1)s(-1)), on/off ratio (10(7)), and other desirable field-effect properties that meet impactful OFET application requirements.

No MeSH data available.


Related in: MedlinePlus

Thin-film UV-vis adsorption spectra of (I) and its blends with polystyrene.(a) Increase in absorbance of absorption peaks at ~825 nm in polystyrene blended films (spectra normalized at ~750 nm); (b) red-shifts of ~825 nm-absorption maxima of polystyrene blended films from that of neat (I) film; and (c) Chemical structure of DPP-DTT, (I).
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f1: Thin-film UV-vis adsorption spectra of (I) and its blends with polystyrene.(a) Increase in absorbance of absorption peaks at ~825 nm in polystyrene blended films (spectra normalized at ~750 nm); (b) red-shifts of ~825 nm-absorption maxima of polystyrene blended films from that of neat (I) film; and (c) Chemical structure of DPP-DTT, (I).

Mentions: Facilitated crystal growth of organic semiconductors to enhance their charge transport efficacy have been reported222324252627282930313233. These are primarily solvency-controlled crystallization from “marginal” solvents or phase separation of semiconductor molecules into higher crystallinity in inert polymer blends202932. However, many of these reported processing procedures to enhance charge transport properties of organic semiconductors are neither amenable to common printing techniques nor readily scalable for practical adoption. In this work, we report our studies on medium-assisted self-assembly of a solution processable, lower-MW, low-mobility diketopyrrolopyrrole-dithienylthieno[3,2-b]thiophene (DPP-DTT) polymer semiconductor, (I) as shown in Fig. 1, into high crystalline orders in a semiconductor film system for enhanced charge transport efficacy. The saturated field-effect mobility of lower-MW (I) was as low as 10−3 cm2 V−1s−1 21, while those of high-MW materials could be high as over 10 cm2 V−1s−1 10. However, the high-MW polymer has severe processing difficulties, thus rendering its practical application highly questionable. Through our studies, we have succeeded in creating a long-ranged nanowire semiconductor network of high crystalline orders from a lower-MW (I) through a facile solution process. This has dramatically propelled the field-effect mobility and on/off ratio of lower-MW (I) from about 1.5 cm2 V−1s−1 and 105 respectively to over 8 cm2 V−1s−1 and 107 respectively under ambient conditions. These OFET properties are functionally more than sufficient for many impactful electronic applications (e.g., display backplane electronics, ultra-low-cost radio-frequency identification tags, etc.)17.


Solution-Processed Donor-Acceptor Polymer Nanowire Network Semiconductors For High-Performance Field-Effect Transistors.

Lei Y, Deng P, Li J, Lin M, Zhu F, Ng TW, Lee CS, Ong BS - Sci Rep (2016)

Thin-film UV-vis adsorption spectra of (I) and its blends with polystyrene.(a) Increase in absorbance of absorption peaks at ~825 nm in polystyrene blended films (spectra normalized at ~750 nm); (b) red-shifts of ~825 nm-absorption maxima of polystyrene blended films from that of neat (I) film; and (c) Chemical structure of DPP-DTT, (I).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4835732&req=5

f1: Thin-film UV-vis adsorption spectra of (I) and its blends with polystyrene.(a) Increase in absorbance of absorption peaks at ~825 nm in polystyrene blended films (spectra normalized at ~750 nm); (b) red-shifts of ~825 nm-absorption maxima of polystyrene blended films from that of neat (I) film; and (c) Chemical structure of DPP-DTT, (I).
Mentions: Facilitated crystal growth of organic semiconductors to enhance their charge transport efficacy have been reported222324252627282930313233. These are primarily solvency-controlled crystallization from “marginal” solvents or phase separation of semiconductor molecules into higher crystallinity in inert polymer blends202932. However, many of these reported processing procedures to enhance charge transport properties of organic semiconductors are neither amenable to common printing techniques nor readily scalable for practical adoption. In this work, we report our studies on medium-assisted self-assembly of a solution processable, lower-MW, low-mobility diketopyrrolopyrrole-dithienylthieno[3,2-b]thiophene (DPP-DTT) polymer semiconductor, (I) as shown in Fig. 1, into high crystalline orders in a semiconductor film system for enhanced charge transport efficacy. The saturated field-effect mobility of lower-MW (I) was as low as 10−3 cm2 V−1s−1 21, while those of high-MW materials could be high as over 10 cm2 V−1s−1 10. However, the high-MW polymer has severe processing difficulties, thus rendering its practical application highly questionable. Through our studies, we have succeeded in creating a long-ranged nanowire semiconductor network of high crystalline orders from a lower-MW (I) through a facile solution process. This has dramatically propelled the field-effect mobility and on/off ratio of lower-MW (I) from about 1.5 cm2 V−1s−1 and 105 respectively to over 8 cm2 V−1s−1 and 107 respectively under ambient conditions. These OFET properties are functionally more than sufficient for many impactful electronic applications (e.g., display backplane electronics, ultra-low-cost radio-frequency identification tags, etc.)17.

Bottom Line: Organic field-effect transistors (OFETs) represent a low-cost transistor technology for creating next-generation large-area, flexible and ultra-low-cost electronics.Conversely, the readily soluble, low-MW D-A polymers give low mobility.With the help of cooperative shifting motion of polystyrene chain segments, (I) readily self-assembled and crystallized out in the polystyrene matrix as an interpenetrating, nanowire semiconductor network, providing significantly enhanced mobility (over 8 cm(2)V(-1)s(-1)), on/off ratio (10(7)), and other desirable field-effect properties that meet impactful OFET application requirements.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics and Institute of Advanced Materials, Hong Kong Baptist University, Hong Kong SAR, P. R. China.

ABSTRACT
Organic field-effect transistors (OFETs) represent a low-cost transistor technology for creating next-generation large-area, flexible and ultra-low-cost electronics. Conjugated electron donor-acceptor (D-A) polymers have surfaced as ideal channel semiconductor candidates for OFETs. However, high-molecular weight (MW) D-A polymer semiconductors, which offer high field-effect mobility, generally suffer from processing complications due to limited solubility. Conversely, the readily soluble, low-MW D-A polymers give low mobility. We report herein a facile solution process which transformed a lower-MW, low-mobility diketopyrrolopyrrole-dithienylthieno[3,2-b]thiophene (I) into a high crystalline order and high-mobility semiconductor for OFETs applications. The process involved solution fabrication of a channel semiconductor film from a lower-MW (I) and polystyrene blends. With the help of cooperative shifting motion of polystyrene chain segments, (I) readily self-assembled and crystallized out in the polystyrene matrix as an interpenetrating, nanowire semiconductor network, providing significantly enhanced mobility (over 8 cm(2)V(-1)s(-1)), on/off ratio (10(7)), and other desirable field-effect properties that meet impactful OFET application requirements.

No MeSH data available.


Related in: MedlinePlus