Jpn. J. Appl. Phys. 33 (1994) pp. 4754-4758  |Next Article|  |Table of Contents|
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Growth and Stability of H₂-Phthalocyanine Thin Films on MoS₂ Surfaces Studied by Means of Low-Energy Electron Transmission Spectroscopy

Masahiro Momose, Koji Kamiya¹, Kazuyuki Sugita¹ and Nobuo Ueno¹

(Received May 19, 1994; accepted for publication June 18, 1994)

The growth of H₂-phthalocyanine ( H₂Pc) thin films on MoS₂ single-crystal surfaces was studied by low-energy electron transmission (LEET) spectroscopy. We observed LEET features typical of ultrathin films prepared by direct molecular-beam deposition of H₂Pc molecules as well as by thinning thicker films by heat treatment. The dependence of the work function of the film on the film thickness showed the minimum value at the film thickness at which LEET features characteristic of ultrathin film were observed. The results indicate that the ultrathin film consists of a monolayer of H₂Pc molecules, and the growth of the H₂Pc monolayer is realizable on the MoS₂ surface. Furthermore, it was found that films about 100 Å thick show poor molecular order due to aging at room temperature, while multilayer films of thickness below ∼50 Å are stable. The latter results indicate the difficulty in preparing well-ordered H₂Pc multilayers of sufficient thickness on the MoS₂ surface at room temperature.

URL: http://jjap.jsap.jp/link?JJAP/33/4754/
DOI: 10.1143/JJAP.33.4754

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