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Suzuki T, Okamoto T, Saeki A, Seki S, Sato H, Matsuo Y. Formation of photoconductive nanowires of tetracene derivative in composite thin film. ACS APPLIED MATERIALS & INTERFACES 2013; 5:1937-1942. [PMID: 23438387 DOI: 10.1021/am302914w] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Nanowires of tetracene dicarboxylic imide disulfide with an N-hexyl substituent (HexylTIDS) were successfully constructed in composite thin film containing poly(3-hexylthiophene) (P3HT). The nanowire structures were investigated by atomic force microscopy and scanning electron microscopy. The photoconductivity of the composite films was evaluated by time-resolved microwave conductivity measurements, revealing that the film containing a 1:1 w/w ratio of HexylTIDS and P3HT exhibited the highest photoconductivity (2.1 × 10(-7) m(2)/(V s)). The intermolecular interactions of HexylTIDS molecules were important in nanowire formation. These results suggest a one-step method for fabricating small-molecule-based nanowires in composite films from a blended solution. This type of composite film, and its fabrication method, will be useful for developing organic thin-film photoelectronic devices.
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Lee HH, Ahn K, Kim DY, Yu CJ, Lee DR. Nanostructures of small-molecule organic crystals on capillary wave surfaces with controllable capillary lengths. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:2646-2650. [PMID: 23351069 DOI: 10.1021/la304346a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We report on the nanostructures of organic small-molecule pentacene crystals that have been vapor-deposited onto the capillary wave surfaces of thin liquid films. The characteristic lateral length of the capillary wave surface or the capillary length can be controlled by changing the thickness of the liquid films and, thus, the van der Waals interaction with the substrate. We find that the morphology of the organic crystals gradually varies from fractals to compact islands as the liquid film thickness increases. The square of average distance between organic crystal grains was also found to be proportional to the liquid film thickness. We discuss the possibility that these effects are driven by capillary fluctuations at the air-liquid interface.
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Reyes-Martinez MA, Ramasubramaniam A, Briseno AL, Crosby AJ. The intrinsic mechanical properties of rubrene single crystals. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2012; 24:5548-5552. [PMID: 22851470 DOI: 10.1002/adma.201201749] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2012] [Indexed: 06/01/2023]
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29
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Marinkovic M, Belaineh D, Wagner V, Knipp D. On the origin of contact resistances of organic thin film transistors. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2012; 24:4005-4009. [PMID: 22730030 DOI: 10.1002/adma.201201311] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2012] [Indexed: 06/01/2023]
Abstract
A model is presented that describes the gate-voltage-dependent contact resistance and channel-length-dependent charge carrier mobility of small-molecule-based organic thin-film transistors in top and bottom drain/source contact configuration.
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30
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Sarker BK, Khondaker SI. Thermionic emission and tunneling at carbon nanotube-organic semiconductor interface. ACS NANO 2012; 6:4993-9. [PMID: 22559008 DOI: 10.1021/nn300544v] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
We study the charge carrier injection mechanism across the carbon nanotube (CNT)-organic semiconductor interface using a densely aligned carbon nanotube array as electrode and pentacene as organic semiconductor. The current density-voltage (J-V) characteristics measured at different temperatures show a transition from a thermal emission mechanism at high temperature (above 200 K) to a tunneling mechanism at low temperature (below 200 K). A barrier height of ∼0.16 eV is calculated from the thermal emission regime, which is much lower compared to the metal/pentacene devices. At low temperatures, the J-V curves exhibit a direct tunneling mechanism at low bias, corresponding to a trapezoidal barrier, while at high bias the mechanism is well described by Fowler-Nordheim tunneling, which corresponds to a triangular barrier. A transition from direct tunneling to Fowler-Nordheim tunneling further signifies a small injection barrier at the CNT/pentacene interface. Our results presented here are the first direct experimental evidence of low charge carrier injection barrier between CNT electrodes and an organic semiconductor and are a significant step forward in realizing the overall goal of using CNT electrodes in organic electronics.
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Yun C, Choi J, Kang HW, Kim M, Moon H, Sung HJ, Yoo S. Digital-mode organic vapor-jet printing (D-OVJP): advanced jet-on-demand control of organic thin-film deposition. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2012; 24:2857-2862. [PMID: 22570284 DOI: 10.1002/adma.201200640] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2012] [Revised: 03/15/2012] [Indexed: 05/31/2023]
Abstract
Digital-mode organic vapor-jet printing (D-OVJP) is demonstrated by producing a series of organic vapor jets. D-OVJP not only inherits all the benefits of a conventional OVJP but also provides an advanced, straightforward control over organic deposition with a pixel-to-pixel precision. Digitally-controlled film thickness and high-performance thin-film transistors are demonstrated with D-OVJP, proving its potential applicability to organic electronics and related areas.
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32
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Chen Y, Podzorov V. Bias stress effect in "air-gap" organic field-effect transistors. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2012; 24:2679-2684. [PMID: 22499410 DOI: 10.1002/adma.201200455] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2012] [Indexed: 05/31/2023]
Abstract
The origin of the bias stress effect related only to semiconductor properties is investigated in "air-gap" organic field-effect transistors (OFETs) in the absence of a material gate dielectric. The effect becomes stronger as the density of trap states in the semiconductor increases. A theoretical model based on carrier trapping and relaxation in localized tail states is formulated. Polar molecular vapors in the gap of "air-gap" OFETs also have a significant impact on the bias stress effect via the formation of bound states between the charge carriers and molecular dipoles at the semiconductor surface.
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Li H, Tee BCK, Giri G, Chung JW, Lee SY, Bao Z. High-performance transistors and complementary inverters based on solution-grown aligned organic single-crystals. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2012. [PMID: 22461243 DOI: 10.1002/adma.v24.19] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
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34
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Li H, Tee BCK, Giri G, Chung JW, Lee SY, Bao Z. High-performance transistors and complementary inverters based on solution-grown aligned organic single-crystals. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2012; 24:2588-91. [PMID: 22461243 DOI: 10.1002/adma.201200151] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2012] [Revised: 02/06/2012] [Indexed: 05/23/2023]
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Pramanik C, Miller GP. An improved synthesis of pentacene: rapid access to a benchmark organic semiconductor. Molecules 2012; 17:4625-33. [PMID: 22522393 PMCID: PMC6268729 DOI: 10.3390/molecules17044625] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2012] [Revised: 04/06/2012] [Accepted: 04/06/2012] [Indexed: 11/24/2022] Open
Abstract
Pentacene is an organic semiconductor used in a variety of thin-film organic electronic devices. Although at least six separate syntheses of pentacene are known (two from dihydropentacenes, two from 6,13-pentacenedione and two from 6,13-dihydro-6,13-dihydroxypentacene), none is ideal and several utilize elevated temperatures that may facilitate the oxidation of pentacene as it is produced. Here, we present a fast (~2 min of reaction time), simple, high-yielding (≥90%), low temperature synthesis of pentacene from readily available 6,13-dihydro-6,13-dihydroxypentacene. Further, we discuss the mechanism of this highly efficient reaction. With this improved synthesis, researchers gain rapid, affordable access to high purity pentacene in excellent yield and without the need for a time consuming sublimation.
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Mityashin A, Olivier Y, Van Regemorter T, Rolin C, Verlaak S, Martinelli NG, Beljonne D, Cornil J, Genoe J, Heremans P. Unraveling the mechanism of molecular doping in organic semiconductors. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2012; 24:1535-9. [PMID: 22362580 DOI: 10.1002/adma.201104269] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2011] [Indexed: 05/16/2023]
Abstract
The mechanism by which molecular dopants donate free charge carriers to the host organic semiconductor is investigated and is found to be quite different from the one in inorganic semiconductors. In organics, a strong correlation between the doping concentration and its charge donation efficiency is demonstrated. Moreover, there is a threshold doping level below which doping simply has no electrical effect.
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Duhm S, Xin Q, Hosoumi S, Fukagawa H, Sato K, Ueno N, Kera S. Charge reorganization energy and small polaron binding energy of rubrene thin films by ultraviolet photoelectron spectroscopy. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2012; 24:901-905. [PMID: 22403829 DOI: 10.1002/adma.201103262] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The hole–phonon coupling of a rubrene monolayer on graphite is measured by means of angle resolved ultraviolet photoelectron spectroscopy. Thus, the charge reorganization energy λ and the small polaron binding energy is determined, which allows insight into the nature of charge transport in condensed rubrene.
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Zhang L, Liu H, Zhao Y, Sun X, Wen Y, Guo Y, Gao X, Di CA, Yu G, Liu Y. Inkjet printing high-resolution, large-area graphene patterns by coffee-ring lithography. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2012; 24:436-440. [PMID: 22190264 DOI: 10.1002/adma.201103620] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2011] [Indexed: 05/31/2023]
Abstract
Taking advantage of the "coffee-ring" effect, graphene electrodes with channel lengths as low as 1-2 micrometers are patterned by inkjet printing. Organic thin film transistors and complementary inverters are also fabricated using these graphene electrodes and show excellent performance.
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Liang Z, Tang Q, Mao R, Liu D, Xu J, Miao Q. The position of nitrogen in N-heteropentacenes matters. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2011; 23:5514-5518. [PMID: 22057779 DOI: 10.1002/adma.201103759] [Citation(s) in RCA: 149] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2011] [Indexed: 05/31/2023]
Abstract
An exploratory study on novel silylethynylated N-heteropentacenes, which have their N atoms on the terminal rings of the pentacene backbone, is reported. This study leads to both p- and n-channel organic thin-film transistors with high field-effect mobility and also reveals that the position of the N atoms plays an important role in tuning the structures and properties of organic semiconductors based on N-heteropentacenes.
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Chen Y, Lee B, Fu D, Podzorov V. The origin of a 650 nm photoluminescence band in rubrene. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2011; 23:5370-5375. [PMID: 22002212 DOI: 10.1002/adma.201102294] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2011] [Revised: 08/20/2011] [Indexed: 05/31/2023]
Abstract
Commonly observed variations in photoluminescence (PL) spectra of crystalline organic semiconductors, including the appearance or enhancement of certain PL bands, are shown to originate from a small amount of structural disorder (e.g., amorphous inclusions embedded in a crystal), rather than be necessarily related to chemical impurities or material oxidation. For instance, in rubrene, a minute amount of such disorder can lead to the appearance of a dominant PL band at 650 nm as a result of triplet excitons captured and fused at these sites, with a subsequent emission from the amorphous phase.
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Cavallini M, D'Angelo P, Criado VV, Gentili D, Shehu A, Leonardi F, Milita S, Liscio F, Biscarini F. Ambipolar multi-stripe organic field-effect transistors. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2011; 23:5091-7. [PMID: 21989845 DOI: 10.1002/adma.201103439] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2011] [Revised: 09/15/2011] [Indexed: 05/12/2023]
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Kaltenbrunner M, Stadler P, Schwödiauer R, Hassel AW, Sariciftci NS, Bauer S. Anodized aluminum oxide thin films for room-temperature-processed, flexible, low-voltage organic non-volatile memory elements with excellent charge retention. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2011; 23:4892-6. [PMID: 21956649 DOI: 10.1002/adma.201103189] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2011] [Indexed: 05/18/2023]
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43
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Muccioli L, D'Avino G, Zannoni C. Simulation of vapor-phase deposition and growth of a pentacene thin film on C60 (001). ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2011; 23:4532-4536. [PMID: 21901761 DOI: 10.1002/adma.201101652] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2011] [Revised: 07/06/2011] [Indexed: 05/31/2023]
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44
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Bae I, Kang SJ, Shin YJ, Park YJ, Kim RH, Mathevet F, Park C. Tailored single crystals of triisopropylsilylethynyl pentacene by selective contact evaporation printing. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2011; 23:3398-3402. [PMID: 21681983 DOI: 10.1002/adma.201100784] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2011] [Revised: 04/18/2011] [Indexed: 05/30/2023]
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45
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Karama U, El-Azhary AA, Almansour AI, Al-Kahtani AA, Al-Turki TM, Jaafar MH. Computational and spectral investigation of 5,12-dihydro-5,12-ethanonaphthacene-13-carbaldehyde. Molecules 2011; 16:6741-6. [PMID: 21829149 PMCID: PMC6264613 DOI: 10.3390/molecules16086741] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2011] [Revised: 08/02/2011] [Accepted: 08/02/2011] [Indexed: 11/16/2022] Open
Abstract
A conformational search of 5,12-dihydro-5,12-ethanonaphthacene-13-carbaldehyde predicted the presence of twelve conformations. The geometry of the twelve conformations established at the B3LYP/6-31G* level showed only six unique ones. Vibrational frequencies were calculated at the B3LYP/6-31G* level. The calculated vibrational frequencies enabled us to interpret the appearance of two bands corresponding to the C=O stretching mode of 5,12-dihydro-5,12-ethanonaphthacene-13-carbaldehyde. The first band corresponded to the 5,12-dihydro-5,12-ethanonaphthacene-13-carbaldehyde structure where the aldehyde group O atom was above the benzene or naphthalene ring. The other band was due to the O atom of the aldehyde group pointing out of the benzene or naphthalene ring.
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Li B, Kao CY, Yoo JW, Prigodin VN, Epstein AJ. Magnetoresistance in an all-organic-based spin valve. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2011; 23:3382-3386. [PMID: 21721052 DOI: 10.1002/adma.201100903] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2011] [Revised: 04/27/2011] [Indexed: 05/31/2023]
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Jou JH, Shen SM, Tsai YC. Pure white organic light-emitting diode with lifetime approaching the longevity of yellow emitter. ACS APPLIED MATERIALS & INTERFACES 2011; 3:3134-3139. [PMID: 21732700 DOI: 10.1021/am2006383] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A high-efficiency pure white organic light-emitting diode was fabricated with lifetime approaching that of the low-excitation-energy (yellow) emitter containing counterpart, or six times that of the deep-blue counterpart. The white device was composed of two emission layers with mixed hosts of different compositions. They were respectively doped with yellow rubrene and deep-blue 4,4'-bis-[4-{N,N,N',N'- tetrakis-(4-fluoro-diphenylamino)-phenyl}-vinyl]-biphenyl. The resulting efficiency was 6.0 lm/W (12.4 cd/A) at 20 mA/cm(2). The long device lifetime may be attributed to the double mixed-host architecture employed that effectively dispersed the injected carriers into three different recombination zones and consequently diluted the damaging effect arising from the accumulated charge from un-recombined carriers, hence leading to a markedly improved lifespan.
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Sun X, Zhang L, Di CA, Wen Y, Guo Y, Zhao Y, Yu G, Liu Y. Morphology optimization for the fabrication of high mobility thin-film transistors. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2011; 23:3128-3133. [PMID: 21608054 DOI: 10.1002/adma.201101178] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2011] [Indexed: 05/30/2023]
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49
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Bisri SZ, Takenobu T, Sawabe K, Tsuda S, Yomogida Y, Yamao T, Hotta S, Adachi C, Iwasa Y. p-i-n Homojunction in organic light-emitting transistors. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2011; 23:2753-8. [PMID: 21608046 DOI: 10.1002/adma.201004572] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2010] [Revised: 02/14/2011] [Indexed: 05/26/2023]
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50
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Liang Z, Tang Q, Xu J, Miao Q. Soluble and stable N-heteropentacenes with high field-effect mobility. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2011; 23:1535-1539. [PMID: 21449057 DOI: 10.1002/adma.201004325] [Citation(s) in RCA: 241] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2010] [Indexed: 05/30/2023]
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