The Preparation and Structure of L-B Films of Mn（Ⅲ）TPP（COOH） and the Ⅰ-Ⅴ Characterization for MIM MIS Devices Fabricated from the L-B Films

This paper reported the preparation and structural characteristics of L-B films of Mn（Ⅲ）TPP（COOH） in which four long hydrocarbon chains were symmetrically attached to the phenyl rings. A fairly good deposition was taken on hydrophobic glass, quartz and solicon slids, UV-Vis absoprtion spectra of L-B films of different layers were measured. The intensity of Soret band of porphy rin molecules was linear increased with layers. This indicated that the uniformity of L-B films in vertical is good. The results of X-rays diffraction of L-B films of Mn（Ⅲ）TPP（COOH） showed that it have periodic structure and the quality of the L-B films could be improved by mixting Mn（Ⅲ）TPP （COOH） with n-cetane. A1/L-B films/A1 and A1/L-B films / Si devices （ie MIM MIS） was fabricated. The I-V characteristic curves of MIM and MIS devices were measured. The electrical resistance of L-B films was 10¹²-10¹³Ω cm normal to the substrates with the same magnitued order as stearic acid layers. This confirmed the conductivity of the L-B films in vertical was independent of the occuring of the porphyrin rings.It is still a insulating films and can offers electric fields greater than the 10⁷V/m.