本論文的研究主要分為兩個部分，第一部分利用溶液吸收光譜、薄膜吸收光譜與電場調制光譜來驗證 PTCDI(C10)有機分子的能階理論，第二部分則是使用電場調制光譜來觀察 PTCDI(C10)分子偶極矩能階分裂情形。
從溶液吸收光譜與薄膜吸收光譜，可以觀察到 PTCDI(C10)從單一分子形成薄膜時，能階有明顯紅移現象，且在能量2.2 eV附近，薄膜吸收光譜比溶液吸收光譜多了由π電子軌域互相耦合形成的π共軛鍵。此外在薄膜吸收光譜與電場調制光譜比較中，電場調制光譜比吸收光譜更能觀察到能階分裂情形。為了驗證在電場調制光譜中觀察到的現象是由偶極矩所造成的能階分裂，我們施加大小不同的電壓在樣品上，並利用高斯函數的一次微分對譜線做擬合，從實驗的結果發現，當施加電壓變大時，能階的分裂也隨之變大，此結果與Gaussian電腦模擬的情況是相似的，由此可確定電場調制光譜可觀察到偶極矩所造成的能階分裂。

Contactless electroreflectance (CER) is used to investigate the optical properties of N,N'-dialkyl-3,4,9,10-perylene tetracarboxylicdiimide (PTCDI-CnH2n+1) thin films sandwiched between indium tin oxide (ITO) and aluminum electrodes (Al/PTCDI-CnH2n+1/ITO/glass substrate) under ambient conditions. The electromodulated optical responses of the Al/PTCDI-CnH2n+1/ITO thin-film structures are characterized under various alternative bias voltages. The energy levels of PTCDI-C10H21 are discussed in terms of the absorption spectrum and electromodulation spectrum. The dipole-dipole-interaction-induced energy level splitting is then investigated using electromodulation spectroscopy.
A red shift of the absorption peak and π-conjugate bonding for PTCDI-C10H21 are observed in the absorption spectra measured under thin-film and solvent states. The red shift of the absorption peaks for PTCDI-C10H21 thin-film is due to the columbic binding energy of the PTCDI-C10H21 dimer during the formation of the PTCDI-C10H21 thin film. Of note, the energy level splitting of PTCDI-C10H21 is found in the electromodulation spectra due to high sensitivity of the CER.
To further investigate the energy level splitting that results from the electric dipole within the PTCDI-C10H21 molecule, various modulation voltages (from 1 to 3 V) are performed on the PTCDI-C10H21 thin film. The value of the energy level splitting increases with increasing applied voltage. This result agrees with that calculated using quantum theory.

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