High carrier mobility in low band gap polymer-based field-effect transistors

Chen, Miaoxiang; Crispin, Xavier; Perzon, Erik; Andersson, Mats R.; Pullerits, Tõnu; Andersson, Lars M; Inganäs, Olle; Berggren, Magnus

doi:10.1063/1.2142289

Cited by 54 publications

(42 citation statements)

References 20 publications

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“…We demonstrate for the first time that BBT-based polymers are promising materials for use in bulk-heterojunction solar cells. Keywords: bis-benzothiadiazole · carbazole · donor-acceptor systems · polymers · solar cells stronger electron acceptors, for example, thienoA C H T U N G T R E N N U N G [3,4-b]pyrazine, [32,33] [1,2,5]thiadiazoloA C H T U N G T R E N N U N G [3,4g]quinoxaline, [34] and pyrazinoA C H T U N G T R E N N U N G [2,3g]quinoxaline, [27] which leads to relatively lower band gap polymers than benzothiadiazole-based D-A polymers. However, no improvement of the overall PCEs has been achieved in comparison to the devices from benzothiadiazole-based D-A polymers/PCBM.…”

Section: Introductionmentioning

confidence: 99%

Copolymers Comprising 2,7‐Carbazole and Bis‐benzothiadiazole Units for Bulk‐Heterojunction Solar Cells

Kim

Yun

Anant

et al. 2011

Chemistry A European J

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On the basis of theoretical considerations of the intramolecular charge transfer (ICT) effect, we have designed a series of donor (D)-acceptor (A) conjugated polymers based on bis-benzothiadiazole (BBT). A PPP-type copolymer of electron-rich 2,7-carbazole (CZ) and electron-deficient BBT units poly[N-(2-decyltetradecyl)-2,7-carbazole-co-7,7'-{4,4'-bis-(2,1,3-benzothiadiazole)}] (PCZ-BBT), a PPV-type copolymer poly[N-(2-decyltetradecyl)-2,7-carbazolevinylene-co-7,7'-{4,4'-bis-(2,1,3-benzothiadiazolevinylene)}] (PCZV-BBTV), and a tercopolymer based on carbazole, thiophene, and BBT poly[N-(2-decyltetradecyl)-2,7-(di-2-thienyl)carbazole-co-7,7'-{4,4'-bis-(2,1,3-benzothiadiazole)}] (PDTCZ-BBT) have been synthesized to understand the influence of BBT acceptor structure and linkage on the photovoltaic characteristics of the resulting materials. Both the HOMO and LUMO of the resulting polymers are found to be deeper-lying than those of benzothiadiazole-based polymers. The measured electrochemical band gaps (eV) are in the following order: PDTCZ-BBT (1.65 eV) < PCZV-BBTV (1.69 eV) < PCZ-BBT (1.75 eV). All the polymers provide a photovoltaic response when blended with a fullerene derivative as an electron acceptor. The best cell reaches a power conversion efficiency of 2.07 % estimated under standard solar light conditions (AM1.5G, 100 mW cm(-2)). We demonstrate for the first time that BBT-based polymers are promising materials for use in bulk-heterojunction solar cells.

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Section: Introductionmentioning

confidence: 99%

Copolymers Comprising 2,7‐Carbazole and Bis‐benzothiadiazole Units for Bulk‐Heterojunction Solar Cells

Kim

Yun

Anant

et al. 2011

Chemistry A European J

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“…Donor–acceptor conjugated polymer systems have emerged as promising candidates for flexible organic electronic devices since their electronic and optoelectronic properties could be efficiently described by intramolecular charge transfer (ICT) 1–6. The studied polymer systems included alternating or random copolymers, polymer blends, and multilayer in the application areas of polymer light‐emitting diodes,7–15 field‐effect transistors (FET),6, 16–21 electrochromic devices,22 and photovoltaic devices 23–31…”

Section: Introductionmentioning

confidence: 99%

“…FET‐based thiophene‐ or fluorene‐based donor–acceptor conjugated polymers have been explored by several groups and us recently 6, 16–19. The studied thiophene‐acceptor conjugated polymers either exhibit p ‐type or ambipolar carrier mobility, including poly(thiophene‐thienopyrazine‐thiophene),6 poly(thiophene‐thiazole),17 poly(thiophene‐pyridazine‐thiophene),18 poly(thiophene‐ alt ‐thiadiazole),20 and poly(thiophene‐ alt ‐quinoxaline) 19.…”

Section: Introductionmentioning

confidence: 99%

“…The above studies suggested that the molecular weight, morphology, and acceptor strength played important roles in the FET characteristics. High hole or electron mobility was also observed in fluorene‐based conjugated polymers such as poly[(9,9‐2,7‐dioctylfluorene)]‐ alt ‐thiophene‐thienopyrazine‐thiophene],6 poly[(9,9‐dioctylfluorene)‐ co ‐benzothiadiazole],15 and poly[(9,9‐dioctylfluorene)‐ alt ‐(thiophene‐thiadiazolo‐[3,4]quinoxaline‐thiophene)] 16. However, the effects of various acceptor structures on the FET mobility of fluorene‐based donor–acceptor conjugated copolymers have not been fully explored yet.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Acceptors on the Electronic and Optoelectronic Properties of Fluorene‐Based Donor–Acceptor–Donor Copolymers

Lee

Cheng

Wang

et al. 2007

Macro Chemistry & Physics

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In this study, four fluorene‐based conjugated copolymers were synthesized to explore the acceptor effects on the electronic and optoelectronic properties. The studied polymers were poly{[2,7‐(9,9‐dihexylfluorene)]‐alt‐[2,2′:5,2″‐terthiophene]} (PFTT) and its derivatives of poly{[2,7‐(9,9′‐dihexylfluorene)]‐alt‐[2,3‐dimethyl‐5,7‐dithien‐2‐yl‐quinoxaline]} (PFDDTQ), poly{[2,7‐(9,9′‐dihexylfluorene)]‐alt‐[4,7‐dithien‐2‐yl‐2,1,3‐benzothiadiazole]} (PFDTBT), and poly{[2,7‐(9,9′‐dihexylfluorene)]‐alt‐[2,3‐dimethyl‐5,7‐dithien‐2‐yl‐thieno[3,4‐b]pyrazine]} (PFDDTTP) with the acceptors of quinoxaline (Q), 2,1,3‐benzothiadiazole (BT), and thieno[3,4‐b]pyrazine (TP), respectively. The order of the band gap was PFDTTP < PFDTBT < PFDDTQ < PFTT, which was on the reverse trend of emission maximum and field‐effect transistor (FET) mobility. The strong acceptor strength of the TP moiety and coplanar backbone in PFDTTP resulted in the highest intramolecular charge transfer (ICT) among the four polymers. The FET mobility of PFDTTP could be varied by two orders of magnitude through the solvent quality. The present study suggested the importance of the acceptor structure on the electronic and optoelectronic properties of semiconducting polymers.magnified image

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“…Among them are donor-acceptor pairs mediated by salt bridges [13], thienopyrazine-based copolymers [14], n-type conjugated polymers based on electron-deficient tetraazabenzodifluoranthene diimide [15][16][17][18], etc. Such conjugated polymer semiconductors with electron donor-acceptor transfer have become of growing interest for organic electronic applications [19][20][21][22], such as photovoltaic cells [23][24][25], light emitting diodes (LEDs) [26][27][28][29], and field-effect transistors [30][31][32][33]. During the past decade more evidence for the electron transport in DNA [34][35][36][37][38] (see review [39]) has also been reported.…”

Section: Introductionmentioning

confidence: 99%

Donor-acceptor electron transport mediated by solitons

2014

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Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modied, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. We study the long-range electron and energy transfer mediated by solitons in a quasi-one-dimensional molecular chain (conjugated polymer, alpha-helical macromolecule, etc.) weakly bound to a donor and an acceptor. We show that for certain sets of parameter values in such systems an electron, initially located at the donor molecule, can tunnel to the molecular chain, where it becomes self-trapped in a soliton state, and propagates to the opposite end of the chain practically without energy dissipation. Upon reaching the end, the electron can either bounce back and move in the opposite direction or, for suitable parameter values of the system, tunnel to the acceptor. We estimate the energy efficiency of the donor-acceptor electron transport depending on the parameter values. Our calculations show that the soliton mechanism works for the parameter values of polypeptide macromolecules and conjugated polymers. We also investigate the donor-acceptor electron transport in thermalized molecular chains.

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High carrier mobility in low band gap polymer-based field-effect transistors

Cited by 54 publications

References 20 publications

Copolymers Comprising 2,7‐Carbazole and Bis‐benzothiadiazole Units for Bulk‐Heterojunction Solar Cells

Copolymers Comprising 2,7‐Carbazole and Bis‐benzothiadiazole Units for Bulk‐Heterojunction Solar Cells

Effects of Acceptors on the Electronic and Optoelectronic Properties of Fluorene‐Based Donor–Acceptor–Donor Copolymers

Donor-acceptor electron transport mediated by solitons

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