Charge carrier mobility study of a mesogenic thienothiophene derivative in bulk and thin films

Mazur, Leszek Mateusz; Castiglione, Andrea; Ocytko, Kornel; Kameche, Farid; Macabies, Romain; Ainsebaa, Abdelmalek; Kréher, David; Heinrich, Benoît; Donnio, Bertrand; Sanaur, Sébastien; Lacaze, Emmanuelle; Fave, Jean‐Louis; Matczyszyn, Katarzyna; Samoć, Marek; Wu, Jeong Weon; Attias, André Jean; Ribierre, Jean Charles; Mathevet, Fabrice

doi:10.1016/j.orgel.2014.01.017

Cited by 24 publications

(15 citation statements)

References 45 publications

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“…There are already a number of reports where the same material shows differences in mobility of several orders of magnitude, depending on the morphology and the molecular packing of the organic semiconducting films. [89][90][91][92][93][94][95] The highest charge carrier mobilities are generally obtained in organic semiconducting films with few defects and with well-ordered and closely packed molecules. 95,96 Unfortunately, such morphologies often lead to strong intermolecular interactions and a quenching of the luminescence.…”

Section: Annealing Effects In Pentafluorene Thin Filmsmentioning

confidence: 99%

Photophysical, amplified spontaneous emission and charge transport properties of oligofluorene derivatives in thin films

Choi

Mazur

Mager

et al. 2014

Phys. Chem. Chem. Phys.

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We investigate the photophysical and amplified spontaneous emission properties of a series of monodisperse solution-processable oligofluorenes functionalized with hexyl chains at the C9 position of each fluorene unit. Thin films of these oligofluorenes are then used in organic field-effect transistors and their charge transport properties are examined. We have particularly focused our attention on the influence of oligofluorene length on the absorption and steady-state fluorescence spectra, on the HOMO/LUMO energy levels, on the photoluminescence lifetime and quantum yield as well as on the amplified spontaneous emission properties and the charge carrier mobilities. Differential scanning calorimetry and X-ray diffraction measurements demonstrate that, among all oligofluorene derivatives used in this study, only the structure and morphology of the pentafluorene film is significantly modified by a thermal treatment above the glass transition temperature, resulting in a 9 nm blue-shift of the fluorescence spectrum without significant changes in the photoluminescence quantum yield and in the amplified spontaneous emission threshold. In parallel, hole field-effect mobility is significantly increased from 8.6 × 10(-7) to 3.8 × 10(-5) cm(2) V(-1) s(-1) upon thermal treatment, due to an increase of crystallinity. This study provides useful insights into the morphological control of oligofluorene thin films and how it affects their photophysical and charge transport properties. Moreover, we provide evidence that, because of the low threshold, the tunability of the amplified spontaneous emission and the photostability of the films, these oligofluorenes are promising candidates for organic solid-state laser applications.

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Section: Annealing Effects In Pentafluorene Thin Filmsmentioning

confidence: 99%

Photophysical, amplified spontaneous emission and charge transport properties of oligofluorene derivatives in thin films

Choi

Mazur

Mager

et al. 2014

Phys. Chem. Chem. Phys.

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“…Polythiophenes as polymeric semiconductors becomee lectrical conductors when doped: poly(3,4-ethylenedioxythiophene)( PEDOT)d oped with polystyrene sulfuric acid becomes ac onjugated conducting polymer and plays ak ey role in plastic electronics, [5] whereas poly-3-hexylthiophene (P3HT), as ap -type organic semiconductor when paired with the n-type C 60 fullerened erivative, exhibits superiorp erformance in organic photovoltaic solar cells. [6] Oligothiophene derivatives end-capped with alkyl chains, show liquid crystalline properties, [7][8][9][10][11][12][13][14][15][16][17][18][19][20] and prefer to self-organize into supramolecular ordered layered structures:t hey display two-dimensional charge transport mobility comparable to inorganic semiconductors of amorphous and polycrystalline silicon, and have been investigated as active materials in organic field-effect transistors (OFET). [21][22][23][24][25] Discoticl iquid crystals (DLCs) [26][27][28][29] that contain afused-thiophene unit [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46] are also ...…”

Section: Introductionmentioning

confidence: 99%

Board‐like Fused‐Thiophene Liquid Crystals and their Benzene Analogs: Facile Synthesis, Self‐Assembly, p‐Type Semiconductivity, and Photoluminescence

Zhao

Wang

et al. 2019

Chemistry An Asian Journal

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Fused-thiophene discotic liquid crystals were designed and easily synthesized by Suzukic oupling and FeCl 3 oxidized tandemc yclodehydrogenation reactions, including homo-andcross-coupling reactions. The resultingh exagonal and rectangular columnar mesomorphic supramolecular structures formed werec haracterized by polarizing optical microscopy,d ifferential scanning calorimetry,a nd smallangle X-ray scattering. The charge carrier transport proper-ties in the mesophases of two of the synthesized fused-thiophene discogensw ere measured by transient photocurrent time-of-flight (TOF) technique, revealing fast hole transport values in the range of 10 À3 to 10 À2 cm 2 V À1 s À1 ,t hus demonstratingp otentiala pplications in electronic devices.T he luminescent sanidic mesogens, with different extended p-conjugated systems, also emitb lue, green, or red light,w ith absolute photoluminescent quantum yields as high as 18 %.

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“…[1][2][3][4][5][6][7][8][9][10][11] In this context, liquid crystalline (LC) molecular semiconductors, able to self-assemble into functional nanostructures, have attracted a great deal of attention. [12][13][14][15][16][17][18] In particular, self-organization of electron donor (D) and acceptor (A) moieties into highly ordered molecular architectures is extremely promising for organic solar cell applications. [19][20][21][22][23][24] Possible control of the energy and the charge transfer processes together with the existence of percolation pathways for both holes and electrons via the formation of well-dened, nanosegregated donoracceptor domains are indeed of critical importance for enhancing photovoltaic performances.…”

Section: Introductionmentioning

confidence: 99%

Structure–charge transfer property relationship in self-assembled discotic liquid-crystalline donor–acceptor dyad and triad thin films

et al. 2016

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The photophysical properties of donor-acceptor (D-A) and donor-acceptor-donor (D-A-D) liquid crystalline dyads and triads based on two different discotic mesogens are examined in thin films by steady-state optical spectroscopy and subpicosecond transient absorption measurements. In these systems, triphenylene and perylene bisimide units are covalently linked by flexible decyloxy chain(s) and act as an electron donor (D) and acceptor (A), respectively. These discotic liquid-crystalline systems form well-separated D and A p-stacked columnar structures in thin films. The absorption spectra of the films indicate an aggregation of the perylene bisimide and triphenylene moieties along the columns. Steadystate photoluminescence measurements show a strong fluorescence quenching that is mainly attributed to a photo-induced charge transfer process taking place between the triphenylene and perylene bisimide units. Subpicosecond transient absorption measurements show that the photoinduced charge transfer (CT) states in the dyad and triad films are formed within 0.3 ps and recombine on a 150-360 ps time scale. In addition, a correlation between the dynamics of the charge recombination process and the spacing distances between D and A units can be established in the dyad and triad films. This study provides important information on the relationship between molecular packing and the charge transfer properties in such self-organized D and A columnar nanostructures.

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Charge carrier mobility study of a mesogenic thienothiophene derivative in bulk and thin films

Cited by 24 publications

References 45 publications

Photophysical, amplified spontaneous emission and charge transport properties of oligofluorene derivatives in thin films

Photophysical, amplified spontaneous emission and charge transport properties of oligofluorene derivatives in thin films

Board‐like Fused‐Thiophene Liquid Crystals and their Benzene Analogs: Facile Synthesis, Self‐Assembly, p‐Type Semiconductivity, and Photoluminescence

Structure–charge transfer property relationship in self-assembled discotic liquid-crystalline donor–acceptor dyad and triad thin films

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