本篇論文主要探討有機分子五環素(Pentacene，簡稱Pc)與鐵磁性金屬鈷的介面特
性，本實驗有機自旋閥結構為Co/Pentacene/Co/Cr/Si(100)，利用X光光電子能譜、紫外光
光電子能譜、X光微結構吸收光譜、磁光柯爾效應儀等工具來分析Pentacene/Co及
Co/Pentacene介面的電子結構、形貌、磁性表徵以及Pentacene分子排列的有序程度。
實驗結果顯示，Pentacene/Co的介面會產生介面電偶極矩(interface dipole)，電洞注
射能障約0.9 eV，但無化學反應；而Pentacene鍍於Co上，分子一開始傾向傾躺，隨著
Pentacene的厚度增加至8 □，分子開始傾斜站立在Co上面，且排列有序；在磁性方面，
當Co的厚度為34 □時，其矯頑場為27 Oe，蒸鍍厚度1 □的Pentacene，矯頑場立刻縮小至
25 Oe。
在Co/Pentacene的介面，金屬Co會滲入Pentacene分子裡面，並與Pentacene分子反應，
導致破壞Pentacene 分子的排列方向性， 最後產生金屬碳化物； 在磁性方面，
Co/Pentacene/SiO2的介面，蒸鍍少量Co並未量測到磁滯曲線，直到Co之厚度增加至33 □
才出現磁滯曲線，矯頑場為5 Oe，繼續增加Co厚度，矯頑場保持在11~13 Oe。因此
Co/Pentacene、Pentacene/ Co兩介面在結構及電子特性是不相同的。

In this thesis, we study the interfacial properties of Co/Pentacene/Co/Cr/Si(100)
multilayer as a vertical pseudo spin-valve structure. We probe the electronic structure,
molecular orientation and magnetic characteristic at the interface of Pentacene/Co and
Co/Pentacene by utilizing X-ray photoemission spectroscopy (XPS), ultraviolet photoelectron
spectroscopy (UPS), polarized near-edge X-ray absorption fine structure (NEXAFS) and
magneto-optical Kerr effect (MOKE)
The interface of Pentacene/Co might be stable chemically with a dipole layer and has a
hole injection barrier of 0.96 eV. Pentacene molecules prefer to lie flatly on Co surface at low
coverage(about 1~4 □). With thickness increasing(at least 8 □), the packing orientation turns
to tilt up on surface. When the Pentacene(1 □) is deposited on Co(34□), the coercivity
becomes a little small.
The result of the study of Co layer on Pentacene show that：Co diffuses into Pentacene.
When third layer of Co is deposited on Pentacene. Then, Co interacts with Pentacene leading
to a formation of chemical bond which destroy the well-order orientation of Pentacene. The
resulting Coblat Carbide has a small coercivity (about 11~13 Oe). In summary, these two
interfacial properties for Co/Pentacene and Pentacene/Co are different not only in structure
but also in electronic properties.

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