Semiconductor Physics, Quantum Electronics & Optoelectronics, 2 (2), P. 69-72 (1999)

PACS 61.10.-i, 61.66.-f, 68.55.-a.

Thin films of organic molecular crystals (OMC) possessing type B lattice: spatial structure of dibenzotetraazaannulene film is related
to its thickness

B. A. Snopok*, Ya. D. Lampeka

* Institute of Semiconductor Physics of NASU, 45, prospect Nauki , 252028 Kiev, Ukraine
E-mail:, Telephone: +380 (44) 265 56 26; 1 Phone (Voice&Fax): +380 (44) 265 18 27
L.V.Pisarzhevskij Institute of Physical Chemistry, NAS Ukraine, 31 prospect Nauki, Kyiv, 252039, Ukraine

Semiconductor Physics, Quantum Electronics & Optoelectronics. 1999. V. 2, No 2. P.69-72. Eng. Il.:4. Ref.:12

Abstract. Diffractometric and optical measurements showed that at considerable (>200 oK) difference between sublimation temperature and substrate one dibenzotetraazaannulene forms well oriented films structure of which depends on their thickness. This phenomena was explained by assuming that the temperature gradient inside the film can be changed during the evaporation. Therewith, both diffusion processes in clusters and the restructurization of small crystallites were suggested to be important components of OMC film formation mechanism.

Keywords: molecular crystals, thin films, growth mechanism, organic semiconductors, thermovacuum deposition, layered solids, type B lattice.

Paper received 28.04.99; revised manuscript received 09.07.99; accepted for publication 12.07.99.

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