Constant initial state spectroscopy of organic molecular films and metal complexes

Abstract

Photoelectron spectroscopy using multiple photon energies was applied to Cu salts of 2,5-Di-Methyl-N,N'-Di-Cyano-Quinone-di-Imine (DMe-DCNQI) which is grown by successive deposition of Cu and DMe-DCNQI followed by annealing, to characterize the grown films of charge transfer salts between organic molecules and metal-organic complexes. Also, polycrystalline films of single organic species, i.e., of Copper Phthalocyanine (CuPc), Hydrogen Phthalocyanine (H2Pc) and C60, and bulk polycrystalline Cu(DMe-DCNQI)2 were analyzed. As the results, the spectra of C60 did not show much difference for different photon energies. Drastic changes were found in the relative peak intensities for the Cu containing materials of CuPc, Cu(DMe-DCNQI)2 and Cu + DCNQI film. Spectra of H2Pc showed minor dependence upon photon energy. It was demonstrated that measuring the intensity of each peak in photoelectron spectroscopy as a function of photon energy was especially useful to identify the orbital of the systems containing both of organic and inorganic species.

Cuと2,5-ジメチル-N,N'-ジシアノキノンジイミン(DMe-DCNQI)を連続的に析出成長させ次いで熱処理して調製したDMe-DCNQIのCu塩に対して複数の光量子エネルギーを用いた光電子分光学を適用し、有機分子と金属-有機錯体の間に位置する電荷移動塩膜の特性を調べた。また、フタロシアニン化銅(CuPc)、フタロシアニン化水素(H2Pc)およびC60の様な単体有機物の多結晶膜、およびバルク多結晶Cu(DMe-DCNQI)2も分析した。結果として、C60のスペクトルは光量子エネルギーによって大きな差を示さなかった。CuPc、Cu(DMe-DCNQI)2およびCu+DCNQI膜などCuを含有する物質は相対ピーク強度において大きな変化を示した。H2Pcのスペクトルは光量子エネルギーへの依存は小さい。光電子分光の各ピークの強度を光量子エネルギーの関数として測定することは有機物および無機物の両者を含む系の軌道を決めるのに特に有効であることが示された。