Structural ordering and enhanced carrier mobility in organic polymer thin film transistors

Kinder, L. R.; Kanicki, Jerzy; Petroff, P. M.

doi:10.1016/j.synthmet.2004.06.024

Cited by 110 publications

(124 citation statements)

References 13 publications

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“…The X-ray diffraction patterns indicate a worse crystalline structure with molecular order of F8T2 in crystal index, 100 in a range of 5 o and 7 o in 2 θ in comparison with the patterns as reported in Ref. 5. This strong peak corresponds to d-spacing along a-axial unit cell, d100=1.56 nm, as a layer distance between sheets of F8T2 chains, which pack in a plane perpendicular to their longitudinal axes [5].…”

Section: Resultssupporting

confidence: 70%

“…5. This strong peak corresponds to d-spacing along a-axial unit cell, d100=1.56 nm, as a layer distance between sheets of F8T2 chains, which pack in a plane perpendicular to their longitudinal axes [5]. As different point in comparison with the patterns reported in Ref.…”

Section: Resultsmentioning

confidence: 50%

“…The F8T2 copolymer as a block co-polymer affords good hole-transporting characterization [4]. Thermal analysis reported that F8T2 had high decomposition (> 400 o C) as a suitable material for useful of organic devices, transistors fabrication and operation [5]. The liquid crystal semiconducting polymer of F8T2 has been applied for electron devices based on molecular interaction of molecular self-coagulation after thermal treatment [6].…”

Section: Introductionmentioning

confidence: 99%

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Photovoltaic properties and morphology of organic solar cells based on liquid-crystal semiconducting polymer with additive

Suzuki¹,

Zushi²,

Suzuki³

et al. 2014

AIP Conference Proceedings

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Section: Resultssupporting

confidence: 70%

Section: Resultsmentioning

confidence: 50%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Photovoltaic properties and morphology of organic solar cells based on liquid-crystal semiconducting polymer with additive

Suzuki¹,

Zushi²,

Suzuki³

et al. 2014

AIP Conference Proceedings

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“…[ 38,45 ] This is very different from that of polycrystalline polymers such as P3HT, poly(9,9-dioctylfl uorene) (PFO), poly(9,9-dioctylfl uorene-alt -benzothiadiazole) (F8BT), and poly(9,9-dioctylfl uorene-alt -bithiophene), which can have rich and complex DSC spectra showing multiple peaks from glass, crystallization, and melting transitions. [ 36,[46][47][48][49][50][51] The thin fi lm optical absorption spectra of PFB and PFMO (Figure 2 resemble the solution spectra using a good solvent in which the chains are in the random-coil conformation. This is exactly as for TFB, being an expected characteristic of an amorphous semiconducting polymer.…”

Section: Resultsmentioning

confidence: 94%

Charge‐Carrier Density Independent Mobility in Amorphous Fluorene‐Triarylamine Copolymers

Campbell

Rawcliffe

Guite

et al. 2016

Adv Funct Materials

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3720 wileyonlinelibrary.com (OPVs), and organic fi eld-effect transistors (OFETs). A crucial parameter in the development of these technologies is the OSC charge-carrier mobility, and how it is related to the different OSC materials, processing, device architectures, and device operating conditions. Many semiconducting polymers and small molecules are amorphous, and such disorder in the physical morphology is expected to refl ect itself in disorder of the energy levels of the hole and electron transport states ( Figure 1 a). Such energetic disorder will directly impact charge transport and mobility. [1][2][3][4][5][6][7][8][9][10][11][12] For such energetically disordered OSCs, one feature predicted by many charge transport models is a charge-carrier density dependent mobility. The original Gaussian disorder model (GDM) developed by Bässler for hopping transport in a Gaussian density of states (DOS) distribution was a single carrier approach, [ 1 ] as were the models based on it which considered both correlated energetic disorder, [ 2 ] with a smoothly varying energy landscape (see Figure 1 a), and the effect of polaronic relaxation. [ 3 ] The percolation model developed by Vissenberg and Matters for transport involving an exponential DOS instead considered multiple carriers, [ 4 ] and this predicted a mobility which has a power-law dependency on the charge-carrier density. The measured transistor mobility falls two to three orders of magnitude below that predicted from the charge-carrier density dependent model, and does not follow the expected power-law relationship. The experimental results for these two amorphous polymers are therefore consistent with a charge-carrier density independent mobility, and this is discussed in terms of polaron-dominated hopping and interchain correlated disorder.

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“…The F8T2:PC 70 BM blend films were annealed at various temperatures ranging from 60 to 240 °C for 10 min in an N 2 glove box. We found that the OPV performance rapidly deteriorated at temperatures close to the glass transition temperature (Tg) of F8T2 (103-121 °C) [16,17]. The AFM images presented in Fig.…”

Section: Resultsmentioning

confidence: 99%

Photovoltaic Properties and Charge Dynamics in Nanophase-Separated F8T2/PCBM Blend Films

Yasuda

Yonezawa

Ito

et al. 2012

J. Photopol. Sci. Technol.

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We studied organic photovoltaics (OPVs) in bulk-heterojunction cells (BHJ) based on a liquid-crystalline fluorine copolymer (F8T2) with the capability of forming periodic nanostructures as the donor and a soluble fullerene (PC 70 BM) as the acceptor. The surface morphology of the blend film shows that the F8T2 and PC 70 BM phases are separated into large islands, which grow in size with increasing fraction of PC 70 BM. The power conversion efficiencies (PCEs) of the cells exhibit a distinct maximum as a function of the PC 70 BM concentration in the BHJ OPVs; the PCE has a maximum at F8T2:PC 70 BM (1:2) and decreases at both lower and higher concentrations of PC 70 BM. The OPV with the highest performance has a PCE of 2.28%. In order to investigate the charge separation that occurs at the interface between F8T2 and PC 70 BM, we also performed ultrafast transient absorption spectroscopy on F8T2:PC 70 BM (1:2) blend films.

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Structural ordering and enhanced carrier mobility in organic polymer thin film transistors

Cited by 110 publications

References 13 publications

Photovoltaic properties and morphology of organic solar cells based on liquid-crystal semiconducting polymer with additive

Photovoltaic properties and morphology of organic solar cells based on liquid-crystal semiconducting polymer with additive

Charge‐Carrier Density Independent Mobility in Amorphous Fluorene‐Triarylamine Copolymers

Photovoltaic Properties and Charge Dynamics in Nanophase-Separated F8T2/PCBM Blend Films

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