Ground and space processing of single-crystalline organic thin films

Carswell, William E.; Zugrav, Maria Ittu; Wessling, Francis C.; Haulenbeek, Glen

doi:10.1016/s0022-0248(99)00821-0

Cited by 4 publications

(3 citation statements)

References 11 publications

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“…In previous papers 5–8 more introductory information is presented on the MTF experiments and the conditions of the microgravity and unit gravity experiments. The experiments have used effusive ampoule physical vapor transport (EAPVT) as a process to deposit organic thin films of DCVA on a variety of substrates.…”

Section: Methodsmentioning

confidence: 99%

“…The organic material used in our experiments is N, N ‐dimethyl‐ p ‐(2,2‐dicyanovinyl) aniline (DCVA), a donor/acceptor‐substituted aromatic compound, with a highly polarizable dissymmetric π‐electron cloud induced by the donor—acceptor interactions across the conjugated system. Thin films of DCVA have been grown in space and on the ground and the results pertaining to vapor transport growth may be found in References 5–8. In this paper the comparison of the microgravity and unit gravity grown thin films is extended to include characterization by visible‐near infrared reflection absorption spectroscopy, polarized Fourier transform infrared (FTIR) spectrometry, differential interference contrast (DIC) optical microscopy, and stylus profilometry.…”

Section: Introductionmentioning

confidence: 99%

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Vapor Transport Growth of Organic Solids in Microgravity and Unit Gravity

Zugrav

Carswell

Haulenbeek

et al. 2002

Annals of the New York Academy of Sciences

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Thin films of an organic nonlinear optical (NLO) material, N, N-dimethyl-p-(2,2-dicyanovinyl) aniline (DCVA), have been grown in space and on the ground by physical vapor transport in an effusive ampoule arrangement. The thin film growth technique developed on the ground is a direct result of information gleaned from experiments in microgravity. This paper covers the results of our experimental investigations for establishing "ideal" terrestrial conditions for deposition of a DCVA film. The active control during the deposition process was exercised by three deposition variables: the material source temperature, the background pressure external to the growth ampoule and the substrate temperature. Successful growth occurred when the difference in temperature between the source material and the copper substrate was 14 degrees C and the background nitrogen pressure was such that the transport was either diffusive or convective. A qualitative diffusion limited boundary was estimated to occur at a pressure of approximately 20 torr. We have probed the DCVA thin films with visible-near infrared reflection absorption spectroscopy, polarized Fourier transform infrared spectrometry, differential interference contrast optical microscopy, and stylus profilometry.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Vapor Transport Growth of Organic Solids in Microgravity and Unit Gravity

Zugrav

Carswell

Haulenbeek

et al. 2002

Annals of the New York Academy of Sciences

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14] The use of the physical vapor transport method to obtain organic single crystals has been increasing, [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] and such crystals have been focused on for application in various types of device. [30][31][32][33] There are high expectations that the crystallographic high periodicity and ideal electronic structures of these crystals can be retained because most impurities can be excluded during crystal growth. Naphtacene, a chainlike aromatic molecule composed of four benzene rings, is a promising material for many device applications; however, few research studies of crystal quality have been performed so far.…”

Section: Introductionmentioning

confidence: 99%

Crystal Quality of Naphtacene Single Crystals Obtained by Physical Vapor Transport Method

Takada²,

Takenaga

2011

Jpn. J. Appl. Phys.

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Time-harmonic methods are required in the accurate design of RF coils as operating frequency increases. This paper presents such a method to find a current density solution on the coil that will induce some desired magnetic field upon an asymmetrically located target region within. This inverse method appropriately considers the geometry of the coil via a Fourier series expansion, and incorporates some new regularization penalty functions in the solution process. A new technique is introduced by which the complex, time-dependent current density solution is approximated by a static coil winding pattern. Several winding pattern solutions are given, with more complex winding patterns corresponding to more desirable induced magnetic fields.

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Crystal growth from the vapour phase in microgravity

Carotenuto¹

2004

Progress in Crystal Growth and Characterization of Materials

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Ground and space processing of single-crystalline organic thin films

Cited by 4 publications

References 11 publications

Vapor Transport Growth of Organic Solids in Microgravity and Unit Gravity

Vapor Transport Growth of Organic Solids in Microgravity and Unit Gravity

Crystal Quality of Naphtacene Single Crystals Obtained by Physical Vapor Transport Method

Crystal growth from the vapour phase in microgravity

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